diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/masks/17736741/hand_A/run0001_t0000-0309.npz b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/masks/17736741/hand_A/run0001_t0000-0309.npz
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diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/masks/17736741/hand_A/run0002_t0000-0309.npz b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/masks/17736741/hand_A/run0002_t0000-0309.npz
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diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/masks/17736741/object/run0001_t0000-0309.npz b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/masks/17736741/object/run0001_t0000-0309.npz
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diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/masks/17736741/occluder/run0001_t0000-0309.npz b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/masks/17736741/occluder/run0001_t0000-0309.npz
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diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/phystwin_window.yaml b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/phystwin_window.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..87c794e80d2c0c01cc74382238c69571e421da69
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/phystwin_window.yaml
@@ -0,0 +1,89 @@
+schema_version: 1
+kind: phystwin_interaction_window
+session:
+  path: /mnt/data2/magna/belt_perception/converted_datasets/sessions/session_20260921_232242_960732
+  session_id: session_20260921_232242_960732
+annotation_interface:
+  method: rerun
+  rerun_timeline: sync_time_ns
+  rerun_launch_command: uv run --no-sync python -m dataset_converter.visualize_rerun
+    --session-path /mnt/data2/magna/belt_perception/converted_datasets/sessions/session_20260921_232242_960732
+    --sensor-types zed
+  timestamp_copy_instructions: Scrub the sync_time_ns timeline in Rerun. Copy the
+    current integer-nanosecond timestamp at the desired start/end moments.
+  notes: ''
+timebase:
+  policy: native_anchor_overlap
+  sync_policy: AnchorStreamSyncPolicy
+  overlap: true
+  anchor_serial: '17736741'
+  anchor_stream_id: zed_17736741_left_rgb
+  timestamp_unit: ns
+  timestamp_reference: sync_time_ns
+  period_ns_estimate: 33449712
+  fps_estimate: 29.895624
+manual_annotation:
+  start_global_timestamp_ns: 1790047397764328186
+  end_global_timestamp_ns: 1790047408067253189
+  start_condition: hand_or_forearm_visible_and_in_contact_with_object
+  end_condition: before_release_or_contact_break
+  expected_visible_hands_or_arms: 1
+  object_description: grey timing belt
+  controller_description: 'hand_A = person''s right hand (bracelet); hand_B = person''s
+    left hand. Participating: hand_A; the other hand is proposed as a reviewed absence,
+    its visible pixels belong to the occluder'
+  annotator_notes: 'C1 AGENT PROPOSAL 2026-10-26, NOT owner-accepted. Proposed anchor-12540311
+    converted frames [278, 585] inclusive. Start = first hand contact: in 17736741
+    (index = anchor index before the anchor drop at 495) fingertips reach the belt
+    wall at conv 278 and wrap it over 279-284 (start_17736741_s1_276-288_zoom.jpg);
+    the top-down anchor view cannot resolve the touch. End = last frame before release:
+    after the belt is set back on the table (~anchor 570-580), the grip is intact
+    through 17736741 conv 586 (= anchor 585; mapping from boundary_end_a586.jpg, dt
+    -12 ms), fingers start to open at 17736741 587-589 and the hand leaves 593+ (end_17736741_s1_584-596_zoom.jpg).
+    No regrasp or second hand at stride 10 (17736741 250-640; 12933256 280-600).'
+resolved_window:
+  start_sync_index: 277
+  end_sync_index_exclusive: 586
+  start_anchor_timestamp_ns: 1790047397764328186
+  end_anchor_timestamp_ns: 1790047408067253189
+  frame_count: 309
+  duration_s: 10.302925
+per_camera_resolution:
+  '12540311':
+    start_source_frame_index: 278
+    end_source_frame_index_exclusive: 586
+    start_source_timestamp_ns: 1790047397776770663
+    end_source_timestamp_ns: 1790047408079927643
+    start_delta_ns: 12442477
+    end_delta_ns: 12674454
+  '12933256':
+    start_source_frame_index: 278
+    end_source_frame_index_exclusive: 587
+    start_source_timestamp_ns: 1790047397771242679
+    end_source_timestamp_ns: 1790047408073517752
+    start_delta_ns: 6914493
+    end_delta_ns: 6264563
+  '17736741':
+    start_source_frame_index: 278
+    end_source_frame_index_exclusive: 587
+    start_source_timestamp_ns: 1790047397764328186
+    end_source_timestamp_ns: 1790047408067253189
+    start_delta_ns: 0
+    end_delta_ns: 0
+  '23007103':
+    start_source_frame_index: 277
+    end_source_frame_index_exclusive: 586
+    start_source_timestamp_ns: 1790047397748067842
+    end_source_timestamp_ns: 1790047408051637039
+    start_delta_ns: -16260344
+    end_delta_ns: -15616150
+validation:
+  within_all_camera_overlap: true
+  start_before_end: true
+  min_abs_camera_delta_ns: 0
+  max_abs_camera_delta_ns: 16260344
+  warnings: []
+created_by: manual
+created_at: '2026-10-26T12:44:09+00:00'
+updated_at: '2026-10-26T12:44:09+00:00'
+
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/preview_c6a_v1.log b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/preview_c6a_v1.log
new file mode 100644
index 0000000000000000000000000000000000000000..0cc83859029d7bb9e3ea69b46dc0be6bde325f04
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/preview_c6a_v1.log
@@ -0,0 +1 @@
+17736741/hand_A t=0: 33038 seed px -> /mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/17736741/correction_preview_c6a_v1/17736741/hand_A_t0000.png
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/preview_c6a_v1_argv.json b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/preview_c6a_v1_argv.json
new file mode 100644
index 0000000000000000000000000000000000000000..21537f36498c8033c14ce2cf5e419bec7b509694
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/preview_c6a_v1_argv.json
@@ -0,0 +1,20 @@
+[
+  "/mnt/data0/magna/belt_perception_wt_c6a_lab_input_preparation_20261027/.venv/bin/python",
+  "scripts/phystwin_real_rgbd.py",
+  "propose",
+  "--session",
+  "/mnt/data2/magna/belt_perception/converted_datasets/sessions/session_20260921_232242_960732",
+  "--frames",
+  "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/17736741/inspection/frames.npz",
+  "--proposal",
+  "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/17736741/proposal_corrections_c6a_v1.json",
+  "--output",
+  "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/17736741/annotations",
+  "--overlays",
+  "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/17736741/correction_preview_c6a_v1",
+  "--checkpoint",
+  "/mnt/data2/magna/belt_perception/third_party/phystwin_external/checkpoints/sam2.1_hiera_large.pt",
+  "--device",
+  "cuda",
+  "--preview-only"
+]
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/preview_c6a_v1_result.json b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/preview_c6a_v1_result.json
new file mode 100644
index 0000000000000000000000000000000000000000..fea02a71dbd44dc18204df2ebc5de4d17dec03f2
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/preview_c6a_v1_result.json
@@ -0,0 +1,5 @@
+{
+  "returncode": 0,
+  "wall_seconds": 8.312150239944458,
+  "accepted": false
+}
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/propagate_17736741_hand_A_c6a_v1.log b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/propagate_17736741_hand_A_c6a_v1.log
new file mode 100644
index 0000000000000000000000000000000000000000..8cae58bdfa35227ad2e594bbe20b40d6cdb395a8
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/propagate_17736741_hand_A_c6a_v1.log
@@ -0,0 +1,3 @@
+
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+
propagate in video: 0it [00:00, ?it/s]
propagate in video: 0it [00:00, ?it/s]
+Wrote /mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/17736741/masks/17736741/hand_A/run0002_t0000-0309.npz
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/propagate_17736741_hand_A_c6a_v1_argv.json b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/propagate_17736741_hand_A_c6a_v1_argv.json
new file mode 100644
index 0000000000000000000000000000000000000000..ff2bcb5443ec9166092411a1d50d9e740718aed2
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/propagate_17736741_hand_A_c6a_v1_argv.json
@@ -0,0 +1,27 @@
+[
+  "/mnt/data0/magna/belt_perception_wt_c6a_lab_input_preparation_20261027/.venv/bin/python",
+  "scripts/phystwin_real_rgbd.py",
+  "propagate",
+  "--session",
+  "/mnt/data2/magna/belt_perception/converted_datasets/sessions/session_20260921_232242_960732",
+  "--frames",
+  "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/17736741/inspection/frames.npz",
+  "--annotations",
+  "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/17736741/annotations",
+  "--output",
+  "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/17736741/masks",
+  "--view",
+  "17736741",
+  "--instance",
+  "hand_A",
+  "--t-start",
+  "0",
+  "--t-stop",
+  "309",
+  "--checkpoint",
+  "/mnt/data2/magna/belt_perception/third_party/phystwin_external/checkpoints/sam2.1_hiera_large.pt",
+  "--device",
+  "cuda",
+  "--note",
+  "C6a agent correction; no owner acceptance"
+]
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/propagate_17736741_hand_A_c6a_v1_result.json b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/propagate_17736741_hand_A_c6a_v1_result.json
new file mode 100644
index 0000000000000000000000000000000000000000..f6b9ae9738999b0a48b550b59b5cdaf8a98a12d2
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/propagate_17736741_hand_A_c6a_v1_result.json
@@ -0,0 +1,5 @@
+{
+  "returncode": 0,
+  "wall_seconds": 28.17747211456299,
+  "accepted": false
+}
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/proposal_corrections_c6a_v1.json b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/proposal_corrections_c6a_v1.json
new file mode 100644
index 0000000000000000000000000000000000000000..87bccb4aab911e47da6bc2d095c5344c5b54a945
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/proposal_corrections_c6a_v1.json
@@ -0,0 +1,72 @@
+{
+  "proposer": "c6a_20261027",
+  "prompts": [
+    {
+      "serial": "17736741",
+      "instance": "hand_A",
+      "t": 0,
+      "points": [
+        [
+          909,
+          697
+        ],
+        [
+          952,
+          760
+        ],
+        [
+          986,
+          734
+        ],
+        [
+          730,
+          611
+        ],
+        [
+          778,
+          641
+        ],
+        [
+          814,
+          660
+        ],
+        [
+          849,
+          674
+        ],
+        [
+          650,
+          595
+        ],
+        [
+          760,
+          733
+        ],
+        [
+          1100,
+          540
+        ]
+      ],
+      "labels": [
+        1,
+        1,
+        1,
+        1,
+        1,
+        1,
+        0,
+        0,
+        0,
+        0
+      ],
+      "box": [
+        665,
+        555,
+        1030,
+        835
+      ],
+      "supersede": true,
+      "note": "Right bracelet hand_A includes the entire visible bare forearm from sleeve cuff through fingertips, excluding bracelet and sleeve. Native t0 shows a large missing proximal-forearm patch. Replace the old t0 prompt: its box began at v620 and its negative (720,605) was on bare skin. New forearm positives cover that patch; bracelet remains negative."
+    }
+  ]
+}
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/proposal_prompts_v1.json b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/proposal_prompts_v1.json
new file mode 100644
index 0000000000000000000000000000000000000000..eb58a2286f786af59b076ed82b591536078c6ace
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/proposal_prompts_v1.json
@@ -0,0 +1,135 @@
+{
+ "proposer": "c1_claude_20261026",
+ "prompts": [
+  {
+   "instance": "object",
+   "points": [
+    [
+     1071,
+     524
+    ],
+    [
+     971,
+     643
+    ],
+    [
+     1225,
+     658
+    ],
+    [
+     1102,
+     770
+    ],
+    [
+     994,
+     720
+    ],
+    [
+     1100,
+     650
+    ],
+    [
+     909,
+     697
+    ]
+   ],
+   "labels": [
+    1,
+    1,
+    1,
+    1,
+    1,
+    0,
+    0
+   ],
+   "box": [
+    956,
+    500,
+    1240,
+    790
+   ],
+   "note": "grey timing belt; interior and hand negative",
+   "serial": "17736741",
+   "t": 0
+  },
+  {
+   "instance": "hand_A",
+   "points": [
+    [
+     909,
+     697
+    ],
+    [
+     952,
+     712
+    ],
+    [
+     784,
+     666
+    ],
+    [
+     849,
+     674
+    ],
+    [
+     720,
+     605
+    ]
+   ],
+   "labels": [
+    1,
+    1,
+    1,
+    0,
+    0
+   ],
+   "box": [
+    690,
+    620,
+    1020,
+    810
+   ],
+   "note": "right hand (bracelet); bracelet negative; sleeve negative",
+   "serial": "17736741",
+   "t": 0
+  },
+  {
+   "instance": "occluder",
+   "points": [
+    [
+     300,
+     600
+    ],
+    [
+     100,
+     300
+    ],
+    [
+     909,
+     697
+    ]
+   ],
+   "labels": [
+    1,
+    1,
+    1
+   ],
+   "box": [
+    0,
+    0,
+    1020,
+    830
+   ],
+   "note": "whole visible person",
+   "serial": "17736741",
+   "t": 0
+  },
+  {
+   "serial": "17736741",
+   "instance": "hand_B",
+   "t": 0,
+   "absence_stop": 309,
+   "note": "nonparticipating left hand: not a controller; its visible pixels (resting on the table edge) belong to the occluder"
+  }
+ ]
+}
\ No newline at end of file
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/propose_c6a_v1.log b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/propose_c6a_v1.log
new file mode 100644
index 0000000000000000000000000000000000000000..5540046bef40218d37fa8beb7df816144e8439b8
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/propose_c6a_v1.log
@@ -0,0 +1 @@
+17736741/hand_A t=0: 33038 seed px -> /mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/17736741/correction_overlays_c6a_v1/17736741/hand_A_t0000.png
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/propose_c6a_v1_argv.json b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/propose_c6a_v1_argv.json
new file mode 100644
index 0000000000000000000000000000000000000000..3c6e33e70fd0fbeb31024ff3af1e8d540a7161e4
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/propose_c6a_v1_argv.json
@@ -0,0 +1,19 @@
+[
+  "/mnt/data0/magna/belt_perception_wt_c6a_lab_input_preparation_20261027/.venv/bin/python",
+  "scripts/phystwin_real_rgbd.py",
+  "propose",
+  "--session",
+  "/mnt/data2/magna/belt_perception/converted_datasets/sessions/session_20260921_232242_960732",
+  "--frames",
+  "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/17736741/inspection/frames.npz",
+  "--proposal",
+  "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/17736741/proposal_corrections_c6a_v1.json",
+  "--output",
+  "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/17736741/annotations",
+  "--overlays",
+  "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/17736741/correction_overlays_c6a_v1",
+  "--checkpoint",
+  "/mnt/data2/magna/belt_perception/third_party/phystwin_external/checkpoints/sam2.1_hiera_large.pt",
+  "--device",
+  "cuda"
+]
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/propose_c6a_v1_result.json b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/propose_c6a_v1_result.json
new file mode 100644
index 0000000000000000000000000000000000000000..5004f85f6b645e81652f98c9c38b7e2bc0f69d5c
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/propose_c6a_v1_result.json
@@ -0,0 +1,5 @@
+{
+  "returncode": 0,
+  "wall_seconds": 7.232464075088501,
+  "accepted": false
+}
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/review_c6a_v1.log b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/review_c6a_v1.log
new file mode 100644
index 0000000000000000000000000000000000000000..013922b3f239eb4130527a084d1ed9cab1dd26bf
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/review_c6a_v1.log
@@ -0,0 +1 @@
+Wrote 4 role videos, 5 sheets and boundary clips to /mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/17736741/review_media_c6a_v1
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/review_c6a_v1_argv.json b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/review_c6a_v1_argv.json
new file mode 100644
index 0000000000000000000000000000000000000000..1c0ac5a5389058da5173fefd83c8e39812729d77
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/review_c6a_v1_argv.json
@@ -0,0 +1,27 @@
+[
+  "/mnt/data0/magna/belt_perception_wt_c6a_lab_input_preparation_20261027/.venv/bin/python",
+  "scripts/phystwin_real_rgbd.py",
+  "review-media",
+  "--session",
+  "/mnt/data2/magna/belt_perception/converted_datasets/sessions/session_20260921_232242_960732",
+  "--frames",
+  "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/17736741/inspection/frames.npz",
+  "--annotations",
+  "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/17736741/annotations",
+  "--masks",
+  "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/17736741/masks",
+  "--output",
+  "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/17736741/review_media_c6a_v1",
+  "--view",
+  "17736741",
+  "--t",
+  "0",
+  "--t",
+  "77",
+  "--t",
+  "154",
+  "--t",
+  "231",
+  "--t",
+  "308"
+]
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/review_c6a_v1_result.json b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/review_c6a_v1_result.json
new file mode 100644
index 0000000000000000000000000000000000000000..b05db3f1a2eac54eaea083d0b7d95c9d7f0b56c7
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/17736741/review_c6a_v1_result.json
@@ -0,0 +1,5 @@
+{
+  "returncode": 0,
+  "wall_seconds": 46.56242775917053,
+  "accepted": false
+}
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/annotations/prompts/23007103/hand_A/t0000_v01.json b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/annotations/prompts/23007103/hand_A/t0000_v01.json
new file mode 100644
index 0000000000000000000000000000000000000000..61755ace7c61c0108dc0edaf0a3e2583853f43a6
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/annotations/prompts/23007103/hand_A/t0000_v01.json
@@ -0,0 +1,104 @@
+{
+  "schema": "real_rgbd_instance_prompt_v1",
+  "binding": {
+    "session_id": "session_20260921_232242_960732",
+    "window_sha256": "4cd37c02fcb03564bf43ddfa9aa0757ce14b19bc387d6c3684b48e1720fd949e",
+    "serials": [
+      "12540311",
+      "12933256",
+      "17736741",
+      "23007103"
+    ],
+    "sync_index_half_open": [
+      278,
+      587
+    ],
+    "anchor_time_ns_first_last": [
+      1790047397781583954,
+      1790047408085256495
+    ]
+  },
+  "serial": "23007103",
+  "view_index": 3,
+  "instance": "hand_A",
+  "frame": {
+    "t": 0,
+    "sync_index": 278,
+    "converted_frame_index": 278,
+    "official_frame_index": 278,
+    "native_container_frame_index": 279,
+    "view_time_ns": 1790047397781583954
+  },
+  "version": 1,
+  "supersedes": null,
+  "image_size_hw": [
+    1080,
+    1920
+  ],
+  "pixel_convention": "native rectified-left pixels: u = column, v = row, integer values at pixel centres",
+  "points_uv": [
+    [
+      1001.0,
+      400.0
+    ],
+    [
+      968.0,
+      455.0
+    ],
+    [
+      940.0,
+      438.0
+    ],
+    [
+      1046.0,
+      361.0
+    ],
+    [
+      1060.0,
+      338.0
+    ]
+  ],
+  "labels": [
+    1,
+    1,
+    1,
+    0,
+    0
+  ],
+  "box_uv": [
+    915.0,
+    320.0,
+    1080.0,
+    480.0
+  ],
+  "source": "agent:c1_claude_20261026",
+  "note": "right hand (bracelet); bracelet negative; sleeve negative",
+  "seed_mask_file": "t0000_v01_seed_mask.npz",
+  "seed_mask_sha256": "5989b02d9b91a988c009ca10260ea3cc9d7a30fde7812346b22dadd2e6ca6ada",
+  "seed_mask_pixels": 8653,
+  "seed_model": {
+    "predictor": "sam2_video_predictor",
+    "config": "configs/sam2.1/sam2.1_hiera_l.yaml",
+    "config_file": "/mnt/data0/magna/belt_perception_wt_c1_lab_proposal_support/segment-anything-2/sam2/configs/sam2.1/sam2.1_hiera_l.yaml",
+    "checkpoint": "/mnt/data2/magna/belt_perception/third_party/phystwin_external/checkpoints/sam2.1_hiera_large.pt",
+    "checkpoint_sha256": "2647878d5dfa5098f2f8649825738a9345572bae2d4350a2468587ece47dd318",
+    "sam2_package": "/mnt/data0/magna/belt_perception_wt_c1_lab_proposal_support/segment-anything-2/sam2",
+    "sam2_git": {
+      "commit": "969dad578a42d4c75624f87821497d37aabfbe99",
+      "clean": true
+    },
+    "build": "build_sam2_video_predictor(apply_postprocessing=True)",
+    "fill_hole_area": 0,
+    "binarize_mask_from_pts_for_mem_enc": true,
+    "non_overlap_masks": false,
+    "image_size": 1024,
+    "frame_preprocessing": "decoded native RGB, PIL default resize to image_size^2, /255, ImageNet mean/std (no JPEG)",
+    "coordinate_normalization": "native (u, v) / (W, H) * image_size (normalize_coords=True)",
+    "mask_logit_threshold": 0.0,
+    "autocast": "bfloat16",
+    "tf32": true,
+    "device": "cuda",
+    "torch": "2.11.0+cu128"
+  },
+  "created_utc": "2026-10-26T13:47:46Z"
+}
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diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/inspection/inspection.json b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/inspection/inspection.json
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+    "session_path": "/mnt/data2/magna/belt_perception/converted_datasets/sessions/session_20260921_232242_960732",
+    "window_path": "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/23007103/phystwin_window.yaml",
+    "window_sha256": "4cd37c02fcb03564bf43ddfa9aa0757ce14b19bc387d6c3684b48e1720fd949e",
+    "window_resolved": {
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+    "anchor_stream_id": "zed_23007103_left_rgb",
+    "sync_clock": "sync_time_ns (host_unix_time_ns)",
+    "device_clock": "device_time_ns",
+    "frame_association": "nearest per view to each anchor time, ties to the earlier frame, no tolerance",
+    "intrinsics_source": "metadata/calibration.json camera_intrinsics at the recorded stream size",
+    "calibration": {
+      "package_dir": "metadata/calibration_package",
+      "world_frame": "table",
+      "pose_source": "phase_05_final",
+      "final_transform_source": "combined_fixed_movable_ba",
+      "source_run_name": "20260921_200440",
+      "candidate_pose_set_name": "fixed020_movable1",
+      "world_T_camera_bundle": "world_T_camera_by_serial.npz",
+      "world_T_camera_bundle_sha256": "2bcc404a8e3c4315527d0573dfdecaac7feec797a2b8cb5b581fbe9f94fbf8d5"
+    }
+  }
+}
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/masks/23007103/hand_A/run0001_t0000-0309.npz b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/masks/23007103/hand_A/run0001_t0000-0309.npz
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diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/masks/23007103/hand_A/run0002_t0000-0309.npz b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/masks/23007103/hand_A/run0002_t0000-0309.npz
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diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/masks/23007103/hand_B/run0001_t0000-0309.npz b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/masks/23007103/hand_B/run0001_t0000-0309.npz
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diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/masks/23007103/object/run0001_t0000-0309.npz b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/masks/23007103/object/run0001_t0000-0309.npz
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diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/masks/23007103/occluder/run0001_t0000-0309.npz b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/masks/23007103/occluder/run0001_t0000-0309.npz
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diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/phystwin_window.yaml b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/phystwin_window.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..7ce221b55a1640241d5a5f7bfb643894fd0dc1dd
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/phystwin_window.yaml
@@ -0,0 +1,89 @@
+schema_version: 1
+kind: phystwin_interaction_window
+session:
+  path: /mnt/data2/magna/belt_perception/converted_datasets/sessions/session_20260921_232242_960732
+  session_id: session_20260921_232242_960732
+annotation_interface:
+  method: rerun
+  rerun_timeline: sync_time_ns
+  rerun_launch_command: uv run --no-sync python -m dataset_converter.visualize_rerun
+    --session-path /mnt/data2/magna/belt_perception/converted_datasets/sessions/session_20260921_232242_960732
+    --sensor-types zed
+  timestamp_copy_instructions: Scrub the sync_time_ns timeline in Rerun. Copy the
+    current integer-nanosecond timestamp at the desired start/end moments.
+  notes: ''
+timebase:
+  policy: native_anchor_overlap
+  sync_policy: AnchorStreamSyncPolicy
+  overlap: true
+  anchor_serial: '23007103'
+  anchor_stream_id: zed_23007103_left_rgb
+  timestamp_unit: ns
+  timestamp_reference: sync_time_ns
+  period_ns_estimate: 33424430
+  fps_estimate: 29.918236
+manual_annotation:
+  start_global_timestamp_ns: 1790047397781583954
+  end_global_timestamp_ns: 1790047408085256495
+  start_condition: hand_or_forearm_visible_and_in_contact_with_object
+  end_condition: before_release_or_contact_break
+  expected_visible_hands_or_arms: 1
+  object_description: grey timing belt
+  controller_description: 'hand_A = person''s right hand (bracelet); hand_B = person''s
+    left hand. Participating: hand_A; the other hand is proposed as a reviewed absence,
+    its visible pixels belong to the occluder'
+  annotator_notes: 'C1 AGENT PROPOSAL 2026-10-26, NOT owner-accepted. Proposed anchor-12540311
+    converted frames [278, 585] inclusive. Start = first hand contact: in 17736741
+    (index = anchor index before the anchor drop at 495) fingertips reach the belt
+    wall at conv 278 and wrap it over 279-284 (start_17736741_s1_276-288_zoom.jpg);
+    the top-down anchor view cannot resolve the touch. End = last frame before release:
+    after the belt is set back on the table (~anchor 570-580), the grip is intact
+    through 17736741 conv 586 (= anchor 585; mapping from boundary_end_a586.jpg, dt
+    -12 ms), fingers start to open at 17736741 587-589 and the hand leaves 593+ (end_17736741_s1_584-596_zoom.jpg).
+    No regrasp or second hand at stride 10 (17736741 250-640; 12933256 280-600).'
+resolved_window:
+  start_sync_index: 278
+  end_sync_index_exclusive: 587
+  start_anchor_timestamp_ns: 1790047397781583954
+  end_anchor_timestamp_ns: 1790047408085256495
+  frame_count: 309
+  duration_s: 10.303673
+per_camera_resolution:
+  '12540311':
+    start_source_frame_index: 278
+    end_source_frame_index_exclusive: 586
+    start_source_timestamp_ns: 1790047397776770663
+    end_source_timestamp_ns: 1790047408079927643
+    start_delta_ns: -4813291
+    end_delta_ns: -5328852
+  '12933256':
+    start_source_frame_index: 278
+    end_source_frame_index_exclusive: 587
+    start_source_timestamp_ns: 1790047397771242679
+    end_source_timestamp_ns: 1790047408073517752
+    start_delta_ns: -10341275
+    end_delta_ns: -11738743
+  '17736741':
+    start_source_frame_index: 279
+    end_source_frame_index_exclusive: 588
+    start_source_timestamp_ns: 1790047397797640595
+    end_source_timestamp_ns: 1790047408100963113
+    start_delta_ns: 16056641
+    end_delta_ns: 15706618
+  '23007103':
+    start_source_frame_index: 278
+    end_source_frame_index_exclusive: 587
+    start_source_timestamp_ns: 1790047397781583954
+    end_source_timestamp_ns: 1790047408085256495
+    start_delta_ns: 0
+    end_delta_ns: 0
+validation:
+  within_all_camera_overlap: true
+  start_before_end: true
+  min_abs_camera_delta_ns: 0
+  max_abs_camera_delta_ns: 16056641
+  warnings: []
+created_by: manual
+created_at: '2026-10-26T12:44:12+00:00'
+updated_at: '2026-10-26T12:44:12+00:00'
+
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/preview_c6a_v1.log b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/preview_c6a_v1.log
new file mode 100644
index 0000000000000000000000000000000000000000..db912acfff64f06d3bdf34d9c4b3b290fe908bb4
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/preview_c6a_v1.log
@@ -0,0 +1 @@
+23007103/hand_A t=0: 13391 seed px -> /mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/23007103/correction_preview_c6a_v1/23007103/hand_A_t0000.png
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/preview_c6a_v1_argv.json b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/preview_c6a_v1_argv.json
new file mode 100644
index 0000000000000000000000000000000000000000..9bd99f955451edba77f82004ab056dff4529add3
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/preview_c6a_v1_argv.json
@@ -0,0 +1,20 @@
+[
+  "/mnt/data0/magna/belt_perception_wt_c6a_lab_input_preparation_20261027/.venv/bin/python",
+  "scripts/phystwin_real_rgbd.py",
+  "propose",
+  "--session",
+  "/mnt/data2/magna/belt_perception/converted_datasets/sessions/session_20260921_232242_960732",
+  "--frames",
+  "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/23007103/inspection/frames.npz",
+  "--proposal",
+  "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/23007103/proposal_corrections_c6a_v1.json",
+  "--output",
+  "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/23007103/annotations",
+  "--overlays",
+  "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/23007103/correction_preview_c6a_v1",
+  "--checkpoint",
+  "/mnt/data2/magna/belt_perception/third_party/phystwin_external/checkpoints/sam2.1_hiera_large.pt",
+  "--device",
+  "cuda",
+  "--preview-only"
+]
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/preview_c6a_v1_result.json b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/preview_c6a_v1_result.json
new file mode 100644
index 0000000000000000000000000000000000000000..23585086eb5b000a6256398bf2a85c4e9d365f40
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/preview_c6a_v1_result.json
@@ -0,0 +1,5 @@
+{
+  "returncode": 0,
+  "wall_seconds": 8.634231567382812,
+  "accepted": false
+}
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/propagate_23007103_hand_A_c6a_v1.log b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/propagate_23007103_hand_A_c6a_v1.log
new file mode 100644
index 0000000000000000000000000000000000000000..e063231b118d2d9140b58d3c534a15525ee2d96f
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/propagate_23007103_hand_A_c6a_v1.log
@@ -0,0 +1,3 @@
+
propagate in video:   0%|          | 0/309 [00:00<?, ?it/s]
propagate in video:   1%|▏         | 4/309 [00:00<00:08, 34.68it/s]
propagate in video:   3%|▎         | 8/309 [00:00<00:10, 29.02it/s]
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+
propagate in video: 0it [00:00, ?it/s]
propagate in video: 0it [00:00, ?it/s]
+Wrote /mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/23007103/masks/23007103/hand_A/run0002_t0000-0309.npz
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/propagate_23007103_hand_A_c6a_v1_argv.json b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/propagate_23007103_hand_A_c6a_v1_argv.json
new file mode 100644
index 0000000000000000000000000000000000000000..a4ff7e53c6608cb208e6ac74e227789c23e0bc3e
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/propagate_23007103_hand_A_c6a_v1_argv.json
@@ -0,0 +1,27 @@
+[
+  "/mnt/data0/magna/belt_perception_wt_c6a_lab_input_preparation_20261027/.venv/bin/python",
+  "scripts/phystwin_real_rgbd.py",
+  "propagate",
+  "--session",
+  "/mnt/data2/magna/belt_perception/converted_datasets/sessions/session_20260921_232242_960732",
+  "--frames",
+  "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/23007103/inspection/frames.npz",
+  "--annotations",
+  "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/23007103/annotations",
+  "--output",
+  "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/23007103/masks",
+  "--view",
+  "23007103",
+  "--instance",
+  "hand_A",
+  "--t-start",
+  "0",
+  "--t-stop",
+  "309",
+  "--checkpoint",
+  "/mnt/data2/magna/belt_perception/third_party/phystwin_external/checkpoints/sam2.1_hiera_large.pt",
+  "--device",
+  "cuda",
+  "--note",
+  "C6a agent correction; no owner acceptance"
+]
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/propagate_23007103_hand_A_c6a_v1_result.json b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/propagate_23007103_hand_A_c6a_v1_result.json
new file mode 100644
index 0000000000000000000000000000000000000000..5cb3c1558af836ea784335091f9b1cf3bfeb10f1
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/propagate_23007103_hand_A_c6a_v1_result.json
@@ -0,0 +1,5 @@
+{
+  "returncode": 0,
+  "wall_seconds": 28.142561435699463,
+  "accepted": false
+}
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/proposal_corrections_c6a_v1.json b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/proposal_corrections_c6a_v1.json
new file mode 100644
index 0000000000000000000000000000000000000000..80c550604bc4150666163b7f0ae313d7e7525d68
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/proposal_corrections_c6a_v1.json
@@ -0,0 +1,72 @@
+{
+  "proposer": "c6a_20261027",
+  "prompts": [
+    {
+      "serial": "23007103",
+      "instance": "hand_A",
+      "t": 0,
+      "points": [
+        [
+          1001,
+          400
+        ],
+        [
+          968,
+          455
+        ],
+        [
+          940,
+          438
+        ],
+        [
+          1080,
+          331
+        ],
+        [
+          1117,
+          307
+        ],
+        [
+          1058,
+          343
+        ],
+        [
+          1046,
+          361
+        ],
+        [
+          1160,
+          305
+        ],
+        [
+          975,
+          425
+        ],
+        [
+          970,
+          500
+        ]
+      ],
+      "labels": [
+        1,
+        1,
+        1,
+        1,
+        1,
+        1,
+        0,
+        0,
+        0,
+        0
+      ],
+      "box": [
+        915,
+        270,
+        1155,
+        485
+      ],
+      "supersede": true,
+      "note": "Right bracelet hand_A includes all visible bare forearm from cuff through fingertips, excluding bracelet, sleeve and the true thumb/index opening. Native t0 and all35 sampled frames show the current hand_A stopping at the bracelet. Replace the old too-tight t0 box and its erroneous skin negative (1060,338); explicit positives now cover forearm. Left resting hand stays occluder-only; hand_B absent."
+    }
+  ]
+}
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/proposal_prompts_v1.json b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/proposal_prompts_v1.json
new file mode 100644
index 0000000000000000000000000000000000000000..80a2150471df43b23aaf0b14f3715a20de981c10
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/proposal_prompts_v1.json
@@ -0,0 +1,175 @@
+{
+ "proposer": "c1_claude_20261026",
+ "prompts": [
+  {
+   "instance": "object",
+   "points": [
+    [
+     901,
+     550
+    ],
+    [
+     1007,
+     494
+    ],
+    [
+     1146,
+     572
+    ],
+    [
+     1007,
+     644
+    ],
+    [
+     1107,
+     628
+    ],
+    [
+     1020,
+     560
+    ],
+    [
+     959,
+     464
+    ]
+   ],
+   "labels": [
+    1,
+    1,
+    1,
+    1,
+    1,
+    0,
+    0
+   ],
+   "box": [
+    886,
+    478,
+    1158,
+    660
+   ],
+   "note": "grey timing belt; interior and fingers negative",
+   "serial": "23007103",
+   "t": 0
+  },
+  {
+   "instance": "hand_A",
+   "points": [
+    [
+     1001,
+     400
+    ],
+    [
+     968,
+     455
+    ],
+    [
+     940,
+     438
+    ],
+    [
+     1046,
+     361
+    ],
+    [
+     1060,
+     338
+    ]
+   ],
+   "labels": [
+    1,
+    1,
+    1,
+    0,
+    0
+   ],
+   "box": [
+    915,
+    320,
+    1080,
+    480
+   ],
+   "note": "right hand (bracelet); bracelet negative; sleeve negative",
+   "serial": "23007103",
+   "t": 0
+  },
+  {
+   "instance": "occluder",
+   "points": [
+    [
+     1428,
+     183
+    ],
+    [
+     1600,
+     326
+    ],
+    [
+     1714,
+     40
+    ],
+    [
+     1357,
+     54
+    ],
+    [
+     1528,
+     433
+    ],
+    [
+     1428,
+     340
+    ],
+    [
+     1214,
+     254
+    ],
+    [
+     1001,
+     400
+    ],
+    [
+     1828,
+     254
+    ],
+    [
+     1800,
+     540
+    ],
+    [
+     1100,
+     226
+    ]
+   ],
+   "labels": [
+    1,
+    1,
+    1,
+    1,
+    1,
+    1,
+    1,
+    1,
+    0,
+    0,
+    0
+   ],
+   "box": [
+    900,
+    0,
+    1919,
+    560
+   ],
+   "note": "whole visible person including the resting left hand; backdrop and calibration board negative",
+   "serial": "23007103",
+   "t": 0
+  },
+  {
+   "serial": "23007103",
+   "instance": "hand_B",
+   "t": 0,
+   "absence_stop": 309,
+   "note": "nonparticipating left hand: not a controller; its visible pixels (resting on the table edge) belong to the occluder"
+  }
+ ]
+}
\ No newline at end of file
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/propose_c6a_v1.log b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/propose_c6a_v1.log
new file mode 100644
index 0000000000000000000000000000000000000000..f376265bc250811c6b36d0a8327535f9ee660ba9
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/propose_c6a_v1.log
@@ -0,0 +1 @@
+23007103/hand_A t=0: 13391 seed px -> /mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/23007103/correction_overlays_c6a_v1/23007103/hand_A_t0000.png
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/propose_c6a_v1_argv.json b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/propose_c6a_v1_argv.json
new file mode 100644
index 0000000000000000000000000000000000000000..a2c5e18d0e33882c06adbcfc7862bae00cea2890
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/propose_c6a_v1_argv.json
@@ -0,0 +1,19 @@
+[
+  "/mnt/data0/magna/belt_perception_wt_c6a_lab_input_preparation_20261027/.venv/bin/python",
+  "scripts/phystwin_real_rgbd.py",
+  "propose",
+  "--session",
+  "/mnt/data2/magna/belt_perception/converted_datasets/sessions/session_20260921_232242_960732",
+  "--frames",
+  "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/23007103/inspection/frames.npz",
+  "--proposal",
+  "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/23007103/proposal_corrections_c6a_v1.json",
+  "--output",
+  "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/23007103/annotations",
+  "--overlays",
+  "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/23007103/correction_overlays_c6a_v1",
+  "--checkpoint",
+  "/mnt/data2/magna/belt_perception/third_party/phystwin_external/checkpoints/sam2.1_hiera_large.pt",
+  "--device",
+  "cuda"
+]
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/propose_c6a_v1_result.json b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/propose_c6a_v1_result.json
new file mode 100644
index 0000000000000000000000000000000000000000..04300fb8c6a6f8ef6cb3a197d276aa1d6fbe0444
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/propose_c6a_v1_result.json
@@ -0,0 +1,5 @@
+{
+  "returncode": 0,
+  "wall_seconds": 7.231879234313965,
+  "accepted": false
+}
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/review_c6a_v1.log b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/review_c6a_v1.log
new file mode 100644
index 0000000000000000000000000000000000000000..0f40b5b9d6f032b367668fb6497ddb7bdf7f0a57
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/review_c6a_v1.log
@@ -0,0 +1 @@
+Wrote 4 role videos, 5 sheets and boundary clips to /mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/23007103/review_media_c6a_v1
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/review_c6a_v1_argv.json b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/review_c6a_v1_argv.json
new file mode 100644
index 0000000000000000000000000000000000000000..7b11994831deb324d745360a92005ee11cd814bf
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/review_c6a_v1_argv.json
@@ -0,0 +1,27 @@
+[
+  "/mnt/data0/magna/belt_perception_wt_c6a_lab_input_preparation_20261027/.venv/bin/python",
+  "scripts/phystwin_real_rgbd.py",
+  "review-media",
+  "--session",
+  "/mnt/data2/magna/belt_perception/converted_datasets/sessions/session_20260921_232242_960732",
+  "--frames",
+  "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/23007103/inspection/frames.npz",
+  "--annotations",
+  "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/23007103/annotations",
+  "--masks",
+  "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/23007103/masks",
+  "--output",
+  "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/23007103/review_media_c6a_v1",
+  "--view",
+  "23007103",
+  "--t",
+  "0",
+  "--t",
+  "77",
+  "--t",
+  "154",
+  "--t",
+  "231",
+  "--t",
+  "308"
+]
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/review_c6a_v1_result.json b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/review_c6a_v1_result.json
new file mode 100644
index 0000000000000000000000000000000000000000..dfff2c8e69a90eab3f63e0b089b15b6752f92403
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/cameras/23007103/review_c6a_v1_result.json
@@ -0,0 +1,5 @@
+{
+  "returncode": 0,
+  "wall_seconds": 45.04236578941345,
+  "accepted": false
+}
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/phystwin_window.yaml b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/phystwin_window.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..8ddd8254dec2f774f10055ddbb09894263d75906
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/phystwin_window.yaml
@@ -0,0 +1,89 @@
+schema_version: 1
+kind: phystwin_interaction_window
+session:
+  path: /mnt/data2/magna/belt_perception/converted_datasets/sessions/session_20260921_232242_960732
+  session_id: session_20260921_232242_960732
+annotation_interface:
+  method: rerun
+  rerun_timeline: sync_time_ns
+  rerun_launch_command: uv run --no-sync python -m dataset_converter.visualize_rerun
+    --session-path /mnt/data2/magna/belt_perception/converted_datasets/sessions/session_20260921_232242_960732
+    --sensor-types zed
+  timestamp_copy_instructions: Scrub the sync_time_ns timeline in Rerun. Copy the
+    current integer-nanosecond timestamp at the desired start/end moments.
+  notes: ''
+timebase:
+  policy: native_anchor_overlap
+  sync_policy: AnchorStreamSyncPolicy
+  overlap: true
+  anchor_serial: '12540311'
+  anchor_stream_id: zed_12540311_left_rgb
+  timestamp_unit: ns
+  timestamp_reference: sync_time_ns
+  period_ns_estimate: 33437929
+  fps_estimate: 29.906158
+manual_annotation:
+  start_global_timestamp_ns: 1790047397776770663
+  end_global_timestamp_ns: 1790047408079927643
+  start_condition: hand_or_forearm_visible_and_in_contact_with_object
+  end_condition: before_release_or_contact_break
+  expected_visible_hands_or_arms: 1
+  object_description: grey timing belt
+  controller_description: 'hand_A = person''s right hand (bracelet); hand_B = person''s
+    left hand. Participating: hand_A; the other hand is proposed as a reviewed absence,
+    its visible pixels belong to the occluder'
+  annotator_notes: 'C1 AGENT PROPOSAL 2026-10-26, NOT owner-accepted. Proposed anchor-12540311
+    converted frames [278, 585] inclusive. Start = first hand contact: in 17736741
+    (index = anchor index before the anchor drop at 495) fingertips reach the belt
+    wall at conv 278 and wrap it over 279-284 (start_17736741_s1_276-288_zoom.jpg);
+    the top-down anchor view cannot resolve the touch. End = last frame before release:
+    after the belt is set back on the table (~anchor 570-580), the grip is intact
+    through 17736741 conv 586 (= anchor 585; mapping from boundary_end_a586.jpg, dt
+    -12 ms), fingers start to open at 17736741 587-589 and the hand leaves 593+ (end_17736741_s1_584-596_zoom.jpg).
+    No regrasp or second hand at stride 10 (17736741 250-640; 12933256 280-600).'
+resolved_window:
+  start_sync_index: 277
+  end_sync_index_exclusive: 585
+  start_anchor_timestamp_ns: 1790047397776770663
+  end_anchor_timestamp_ns: 1790047408079927643
+  frame_count: 308
+  duration_s: 10.303157
+per_camera_resolution:
+  '12540311':
+    start_source_frame_index: 278
+    end_source_frame_index_exclusive: 586
+    start_source_timestamp_ns: 1790047397776770663
+    end_source_timestamp_ns: 1790047408079927643
+    start_delta_ns: 0
+    end_delta_ns: 0
+  '12933256':
+    start_source_frame_index: 278
+    end_source_frame_index_exclusive: 587
+    start_source_timestamp_ns: 1790047397771242679
+    end_source_timestamp_ns: 1790047408073517752
+    start_delta_ns: -5527984
+    end_delta_ns: -6409891
+  '17736741':
+    start_source_frame_index: 278
+    end_source_frame_index_exclusive: 587
+    start_source_timestamp_ns: 1790047397764328186
+    end_source_timestamp_ns: 1790047408067253189
+    start_delta_ns: -12442477
+    end_delta_ns: -12674454
+  '23007103':
+    start_source_frame_index: 278
+    end_source_frame_index_exclusive: 587
+    start_source_timestamp_ns: 1790047397781583954
+    end_source_timestamp_ns: 1790047408085256495
+    start_delta_ns: 4813291
+    end_delta_ns: 5328852
+validation:
+  within_all_camera_overlap: true
+  start_before_end: true
+  min_abs_camera_delta_ns: 0
+  max_abs_camera_delta_ns: 12674454
+  warnings: []
+created_by: manual
+created_at: '2026-10-26T12:44:00+00:00'
+updated_at: '2026-10-26T12:44:00+00:00'
+
diff --git a/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/window_binding.json b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/window_binding.json
new file mode 100644
index 0000000000000000000000000000000000000000..1e9ccba7bdf012acacbc04c43a7f64344b4155c5
--- /dev/null
+++ b/sessions/session_20260921_232242_960732/preprocessing/mask-supplier-window-anchor0278-0585/native/window_binding.json
@@ -0,0 +1,45 @@
+{
+  "session": "session_20260921_232242_960732",
+  "participating_hands": [
+    "hand_A"
+  ],
+  "proposal": {
+    "start_anchor_frame": 278,
+    "end_anchor_frame_inclusive": 585,
+    "start_ns": 1790047397776770663,
+    "end_ns": 1790047408079927643,
+    "rationale": "Start = first hand contact: in 17736741 (index = anchor index before the anchor drop at 495) fingertips reach the belt wall at conv 278 and wrap it over 279-284 (start_17736741_s1_276-288_zoom.jpg); the top-down anchor view cannot resolve the touch. End = last frame before release: after the belt is set back on the table (~anchor 570-580), the grip is intact through 17736741 conv 586 (= anchor 585; mapping from boundary_end_a586.jpg, dt -12 ms), fingers start to open at 17736741 587-589 and the hand leaves 593+ (end_17736741_s1_584-596_zoom.jpg). No regrasp or second hand at stride 10 (17736741 250-640; 12933256 280-600)."
+  },
+  "window_yaml": "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/phystwin_window.yaml",
+  "per_camera": true,
+  "cameras": {
+    "12540311": {
+      "frames": "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/12540311/inspection/frames.npz",
+      "own_converted_half_open": [
+        278,
+        586
+      ]
+    },
+    "12933256": {
+      "frames": "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/12933256/inspection/frames.npz",
+      "own_converted_half_open": [
+        278,
+        587
+      ]
+    },
+    "17736741": {
+      "frames": "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/17736741/inspection/frames.npz",
+      "own_converted_half_open": [
+        278,
+        587
+      ]
+    },
+    "23007103": {
+      "frames": "/mnt/data2/magna/belt_perception_shared/phystwin_model_corpus_expansion/lab/session_20260921_232242_960732/window_anchor0278-0585/cameras/23007103/inspection/frames.npz",
+      "own_converted_half_open": [
+        278,
+        587
+      ]
+    }
+  }
+}