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diff --git a/sessions/session_20260921_225744_574043/preprocessing/orange-belt-prior-v1/native/spline/reprojection.json b/sessions/session_20260921_225744_574043/preprocessing/orange-belt-prior-v1/native/spline/reprojection.json
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diff --git a/sessions/session_20260921_225744_574043/preprocessing/orange-belt-prior-v1/native/spline/spline_init.json b/sessions/session_20260921_225744_574043/preprocessing/orange-belt-prior-v1/native/spline/spline_init.json
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diff --git a/sessions/session_20260921_225744_574043/preprocessing/orange-belt-prior-v1/native/steps/colors.json b/sessions/session_20260921_225744_574043/preprocessing/orange-belt-prior-v1/native/steps/colors.json
new file mode 100644
index 0000000000000000000000000000000000000000..8f040f09dc34f5860dcf3dda690d377b2adf978f
--- /dev/null
+++ b/sessions/session_20260921_225744_574043/preprocessing/orange-belt-prior-v1/native/steps/colors.json
@@ -0,0 +1,67 @@
+{
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diff --git a/sessions/session_20260921_225744_574043/preprocessing/orange-belt-prior-v1/native/steps/diagnose-depth.json b/sessions/session_20260921_225744_574043/preprocessing/orange-belt-prior-v1/native/steps/diagnose-depth.json
new file mode 100644
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--- /dev/null
+++ b/sessions/session_20260921_225744_574043/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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+      "correction_applied": false,
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diff --git a/sessions/session_20260921_225744_574043/preprocessing/orange-belt-prior-v1/native/steps/fit.json b/sessions/session_20260921_225744_574043/preprocessing/orange-belt-prior-v1/native/steps/fit.json
new file mode 100644
index 0000000000000000000000000000000000000000..20fb484e18ec48cc9495bea3a53b04eaa94b2ecd
--- /dev/null
+++ b/sessions/session_20260921_225744_574043/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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+      "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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+      "std_ratio": 2.0,
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diff --git a/sessions/session_20260921_225744_574043/preprocessing/orange-belt-prior-v1/native/steps/hybrid.json b/sessions/session_20260921_225744_574043/preprocessing/orange-belt-prior-v1/native/steps/hybrid.json
new file mode 100644
index 0000000000000000000000000000000000000000..7319e1de16773af683c160da8975cead9e9e691a
--- /dev/null
+++ b/sessions/session_20260921_225744_574043/preprocessing/orange-belt-prior-v1/native/steps/hybrid.json
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diff --git a/sessions/session_20260921_225744_574043/preprocessing/orange-belt-prior-v1/native/steps/inputs.json b/sessions/session_20260921_225744_574043/preprocessing/orange-belt-prior-v1/native/steps/inputs.json
new file mode 100644
index 0000000000000000000000000000000000000000..c36239199c36a2c1c5ab6a6ea2089cb190decd98
--- /dev/null
+++ b/sessions/session_20260921_225744_574043/preprocessing/orange-belt-prior-v1/native/steps/inputs.json
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diff --git a/sessions/session_20260921_225744_574043/preprocessing/orange-belt-prior-v1/native/steps/review.json b/sessions/session_20260921_225744_574043/preprocessing/orange-belt-prior-v1/native/steps/review.json
new file mode 100644
index 0000000000000000000000000000000000000000..6650fa32fc50489c1879c6ea6b9d6fdd40d12e8a
--- /dev/null
+++ b/sessions/session_20260921_225744_574043/preprocessing/orange-belt-prior-v1/native/steps/review.json
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+{
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\ No newline at end of file
diff --git a/sessions/session_20260921_225744_574043/preprocessing/orange-belt-prior-v1/native/steps/tube.json b/sessions/session_20260921_225744_574043/preprocessing/orange-belt-prior-v1/native/steps/tube.json
new file mode 100644
index 0000000000000000000000000000000000000000..5d268bcffc7fb87d9dc27f539b64835c96fa4263
--- /dev/null
+++ b/sessions/session_20260921_225744_574043/preprocessing/orange-belt-prior-v1/native/steps/tube.json
@@ -0,0 +1,60 @@
+{
+  "status": "ok",
+  "settings": {
+    "radius_m": 0.00295,
+    "step_t": 0.125,
+    "step_angle_deg": 30
+  },
+  "outputs": {
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+      "watertight": true,
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+      "winding_consistent": true,
+      "signed_volume_m3": 1.667425946654692e-05,
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+    "files": {
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+}
\ No newline at end of file
diff --git a/sessions/session_20260921_225744_574043/preprocessing/orange-belt-prior-v1/native/tube/geometry.npz b/sessions/session_20260921_225744_574043/preprocessing/orange-belt-prior-v1/native/tube/geometry.npz
new file mode 100644
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+++ b/sessions/session_20260921_225744_574043/preprocessing/orange-belt-prior-v1/native/tube/geometry.npz
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diff --git a/sessions/session_20260921_225744_574043/preprocessing/orange-belt-prior-v1/native/tube/triangle_areas.npz b/sessions/session_20260921_225744_574043/preprocessing/orange-belt-prior-v1/native/tube/triangle_areas.npz
new file mode 100644
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+++ b/sessions/session_20260921_225744_574043/preprocessing/orange-belt-prior-v1/native/tube/triangle_areas.npz
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