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diff --git a/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/manifest.json b/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/manifest.json
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diff --git a/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/spline/reprojection.json b/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/spline/reprojection.json
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diff --git a/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/spline/reprojection_residuals.npz b/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/spline/reprojection_residuals.npz
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diff --git a/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/spline/spline_fit.json b/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/spline/spline_fit.json
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diff --git a/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/spline/spline_init.json b/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/spline/spline_init.json
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diff --git a/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/steps/colors.json b/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/steps/colors.json
new file mode 100644
index 0000000000000000000000000000000000000000..bfa6ebade0ddfd56f0e097805bb015a0144b9746
--- /dev/null
+++ b/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/steps/colors.json
@@ -0,0 +1,67 @@
+{
+  "status": "ok",
+  "settings": {
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+    "two_sided": false,
+    "depth_tolerance_m": 0.025,
+    "first_hit_tolerance_m": 0.0002,
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diff --git a/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/steps/diagnose-depth.json b/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/steps/diagnose-depth.json
new file mode 100644
index 0000000000000000000000000000000000000000..bd22cbeda89e148c1dcca0042b9e8834784baffe
--- /dev/null
+++ b/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/steps/diagnose-depth.json
@@ -0,0 +1,110 @@
+{
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+  "settings": {
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+      80
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+        80
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+      "interior_erosion_px": 2,
+      "correction_applied": false,
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diff --git a/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/steps/fit.json b/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/steps/fit.json
new file mode 100644
index 0000000000000000000000000000000000000000..91b76c2579214d53518c842d6e2d304a102fa891
--- /dev/null
+++ b/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/steps/fit.json
@@ -0,0 +1,202 @@
+{
+  "status": "ok",
+  "settings": {
+    "object": {
+      "name": "orange_round_belt",
+      "representation": "tube",
+      "fitter_source": "spline_estimation.round_belt_backend (accepted A/B priors)",
+      "dimension_source": "owner 2.95 mm cord radius (RP S-E, 2026-09-26)",
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+      "ribbon_width_m": null,
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+      "step_angle_deg": 30,
+      "u_resolution": null,
+      "overlap_rule": "ring_separation",
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+    "relative_loss_tolerance": 1e-07,
+    "reprojection": {
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+      "direction": "visible mask pixels to projected centerline",
+      "ribbon_twist_stage": null,
+      "mask": "accepted object outside hand/occluder union",
+      "view_aggregation": "equal view means",
+      "distance": "metric image plane using per-view median visible belt depth and fx/fy",
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+      "huber_delta_m": 0.005,
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+      "baseline_run": null
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diff --git a/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/steps/hybrid.json b/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/steps/hybrid.json
new file mode 100644
index 0000000000000000000000000000000000000000..da34ffc6511d35f4523e5fc1f0f775f3aa8bf973
--- /dev/null
+++ b/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/steps/hybrid.json
@@ -0,0 +1,24 @@
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diff --git a/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/steps/inputs.json b/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/steps/inputs.json
new file mode 100644
index 0000000000000000000000000000000000000000..b3c2116a3c237c437de5864148337ddcf54527fb
--- /dev/null
+++ b/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/steps/inputs.json
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\ No newline at end of file
diff --git a/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/steps/review.json b/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/steps/review.json
new file mode 100644
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\ No newline at end of file
diff --git a/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/steps/tube.json b/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/steps/tube.json
new file mode 100644
index 0000000000000000000000000000000000000000..58014e25824ab301387e173169d0b64eeeb46084
--- /dev/null
+++ b/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/steps/tube.json
@@ -0,0 +1,60 @@
+{
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+  "settings": {
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\ No newline at end of file
diff --git a/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/tube/geometry.npz b/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/tube/geometry.npz
new file mode 100644
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diff --git a/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/tube/triangle_areas.npz b/sessions/session_20260921_230338_900969/preprocessing/orange-belt-prior-v1/native/tube/triangle_areas.npz
new file mode 100644
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