fix(dancer): adopt explicit skirt and add mesh-only v4 replay

dancer/README.md

@@ -1,12 +1,15 @@
 # The dancer
 
+**Current producer mesh declaration:** `config.json` carries the owner-selected smear50 bottomwear as an explicit payload at parts 1.64.0, with `bottomwear` still in `turn.depths`. Its setup seam is zero. This is separate from the immutable accepted dance replay below. Producer reproduction and the remaining motion/preservation blockers are recorded under `provenance/smear50-producer.json`.
+
 **Current accepted dance: owner v3, 2026-10-24.** Run `sh build-accepted-dance.sh` from this directory. The corpus stores the accepted rig/motion once and replays them with released core; no trial checkout, acquisition, generation, retarget or hand authoring is needed. [V3 source and commands](accepted-dance/v3/README.md) and `declared-repairs-v3.json` bind the exact native-frame target. The setup keeper below is separate base provenance. The corpus-only v3 default replay exited 0: all three compiled hashes and native 391-PNG concatenation `b75fc5696ac468f3ea9f58cc892d79389d66bf6ce7aeb31428f95350b9121029` match the accepted target exactly; gate 23 PASS / 0 FAIL / 13 SKIP / 14 excluded. [Actual v3 proof](accepted-dance/v3/reproduction-evidence.json).
 
 | Dance version | Source date | Record / selection |
 | --- | --- | --- |
 | v1 | 2026-10-24 | Accepted R3/v5, [trial #52](https://github.com/rig-c/examples/pull/52) and [corpus #53](https://github.com/rig-c/examples/pull/53); original declarations/evidence retained; explicit `sh build-accepted-dance.sh --version v1 work/accepted-v1` |
 | v2 | 2026-10-24 | Intermediate generated holds and lifted-jacket strip, [#38](https://github.com/rig-c/examples/issues/38); recorded, not promoted |
 | v3 | 2026-10-24 | Owner-named final, [#56](https://github.com/rig-c/examples/issues/56), [trial #57](https://github.com/rig-c/examples/pull/57); permanent hip waist, generated chest holds, compensated +17u chest lift and front-slot lowering; current default |
+| v4 | 2026-10-25 | Explicit smear50 mesh-only candidate, [#71](https://github.com/rig-c/examples/issues/71); original eval 20/4, bottomwear folds 0; [source, reproduction and evidence](accepted-dance/v4/README.md); opt in with `sh build-accepted-dance.sh --version v4 work/accepted-v4`; owner eye acceptance pending |
 
 Generated painting and saved rig inputs accepted on 2026-10-22. Origin:
 accepted dance-skirt v3/v5; original painting and See-through runs, 2026-10-13.
@@ -20,7 +23,7 @@ Each input's origin is recorded in `source-manifest.json`.
   `layers/full/` and `layers/head/` each contain 29 tagged parts and saved
   metadata. Each `layers.json` retains original server filename/depth
   provenance; exported parts are addressed by `parts/<tag>.png`.
-- `config.json` preserves the v3 keeper producer values with 11 physics constraints; its added `x-repairs` metadata pins the declared hand record.
+- `config.json` states the explicit smear50 producer mesh with the original 11 physics declarations. `provenance/keeper-config-before-smear50.json` preserves the exact previous keeper for historical replay. `x-repairs` still pins the unchanged historical hand record.
   `config-base.json` is the historical 9-constraint input, not the active
   keeper. `under/`, `stress.json` and `requirements.json` close the declared
   build dependencies.
@@ -38,24 +41,28 @@ No reference video, audio, picture-in-picture, installed dependency tree or priv
 log is included. The current accepted dance payload is explicitly stored once under accepted-dance/v3/. Generation model names are source records; model binary hashes
 are not available in those records.
 
-## Reproduce the keeper-config build
+## Reproduce the current producer build
 
 From this directory, with Bun and Python 3:
 
 ```sh
 sh build.sh
 ```
 
-This command builds `config.json`; it does not build `accepted/rig.json`.
-**It may exit 1: the recorded current run below did so at the seam check.**
-Output is ignored under `work/`. The accepted rig has the separate core build described below.
+This command builds `config.json`; the explicit producer passes the unchanged setup seam at mean 0 and 0 pixels over 40. Output is ignored under `work/`. The saved accepted rig has the separate core build described below.
+
+The adopted canonical producer bytes are in `producer/rig/`. A fresh rebuild and byte/RGBA inventory comparison runs as:
+
+```sh
+bun tools/verify-producer.mjs --out work/fresh-producer
+```
+
+Choose a new output directory for each rebuild. The verifier refuses changed/missing files, changed decoded PNG pixels, a red check, or changed active config/package pins. It verifies all 31 producer files; it does not claim the original accepted dance can be played on this different producer rig.
 
-Direct package pins are `@rig-c/parts` 1.60.0, `rig-c` 2.67.2 and the official
-round-trip runtime `@esotericsoftware/spine-core` 4.3.13. The recorded Nova run
-used Bun 1.4.2, Node v24.21.0 and Python 3.12.3. `check-inputs.py` checks file
+The current frozen producer install pins `@rig-c/parts` 1.64.0, direct `rig-c` 2.67.2 and official `@esotericsoftware/spine-core` 4.3.13. Parts resolves its own compatible rig-c 2.70.0, recorded in `bun.lock`; that is the compiler its build/check invokes. The new Nova producer runs use Bun 1.4.4. Historical dance replay keeps its separate frozen package pins. `check-inputs.py` checks file
 hashes and config/map closure; it does not render or establish rig correctness.
 
-## Recorded current build, 2026-10-23
+## Historical keeper-config build, 2026-10-23
 
 One targeted closure and keeper-config build ran on Nova. Inputs were unchanged
 through the run. No fallback build or rig modification was performed.
@@ -80,15 +87,14 @@ The documented diagnostic is to inspect the `seam pair` lines and
 No corrective config, art, geometry, limit or gate changes were made. This
 config-build refusal does not establish a regression or a failure of the
 separate accepted hand-built rig. The config gap is recorded for a separate parts issue and does not block use
-of the saved accepted rig. No producer fix is included.
+of the saved accepted rig. This historical refusal is retained as provenance; the current explicit producer above resolves its setup seam.
 
 ## Input integrity
 
 `source-manifest.json` lists repository-relative input paths, byte counts,
 SHA-256 hashes, source hashes and origins. `path-normalization.json` records the
-two See-through metadata image-path changes. Keeper producer values and historical base config bytes are preserved exactly.
-The keeper adds only `x-repairs` metadata; removing that field and writing
-two-space JSON with one trailing LF recovers its original recorded hash.
+two See-through metadata image-path changes. Historical base config bytes and the archived pre-smear50 keeper are preserved exactly.
+Removing only `x-repairs` from the archived keeper and writing two-space JSON with one trailing LF recovers its original recorded hash. The active config additionally declares the explicit skirt; its canonical producer inventory has a separate config hash.
 Accepted image bytes and map values are preserved.
 
 ## Build the accepted rig
@@ -97,7 +103,7 @@ The accepted v3 source is the hand-built transplant recorded by
 `replace_shins.py`, using the weighted-shins output from the parts 1.57 source
 build. `port_config.py` writes the keeper producer-input config and port ledger;
 it does not write the accepted rig. Its external historical dependencies were
-not followed or executed for this package. Keeper geometry and producer values remain unchanged; only the declared-record metadata pin is added.
+not followed or executed for this package. The archived keeper geometry and producer values remain unchanged. Historical replay readers explicitly use that archive for their original config preimage; they do not substitute the new active producer mesh.
 
 From this directory:
 

dancer/accepted-dance/v4/README.md

@@ -0,0 +1,57 @@
+# Mesh-only dance candidate v4
+
+V4 replaces only `skins.default.bottomwear.bottomwear` in immutable v3 with the
+owner-selected smear50 payload. Motion bytes, all other attachments, bones,
+constraints, slots and skeleton remain identical. `provenance.json` binds the
+sources and payload. V3 remains the default pending owner video acceptance.
+
+From `dancer/`, select this replay explicitly:
+
+```sh
+sh build-accepted-dance.sh --version v4 work/accepted-v4
+```
+
+The frozen runtime installs from the dancer lockfile: released core 2.67.2,
+Spine runtime 4.3.13. Python 3 and Bun are required. The real compile reader runs
+before the build; the unchanged gate runs before render. A fresh output path is
+required. Numbered PNGs are deleted after their ordered-byte receipt is written.
+For staged measurement, `tools/reproduce-smear50.py` also supports `--build-only`,
+`--render-only` and explicit `--keep-frames`. Measurement tools need retained
+frames until the sheet/video verdict; delete them after recording the receipt.
+
+The separate config producer uses parts 1.64.0 and its resolved core 2.70.0.
+It is not the accepted dance rig and cannot consume its missing control bones.
+These dance measurements apply only to this v4 replay.
+
+| Original instrument / fixed viewport | V3 | V4 |
+| --- | ---: | ---: |
+| Left share >= .60, rounded to three decimals, original eval.py | 31 | 20 |
+| Right share >= .60, same instrument | 13 | 4 |
+| Bottomwear fold frames, all 391 samples | 0 | 0 |
+| Known shins fold frames, reported separately | 269 | 269 |
+| f254 left share | .860 | .745 |
+| f266 right share | .799 | .671 |
+| Worst minimum singular value, f278 | .119286 | .196432 |
+
+These are a reduction, not elimination of the visible stair artifact. M1 tip
+trajectory deviation is 0 units. Maximum silhouette deviation against accepted
+v3 is 15.425046 pixels at f279, including 14.164224 pixels of setup shift. The
+older 4.6-pixel figure used a different bind baseline and is not this comparison.
+
+The gate reports 23 PASS, 0 FAIL, 13 SKIP, 14 excluded for each version. V3's three
+compiled hashes and 391-frame native concatenation reproduce its accepted
+record exactly. The new render receipts bind source/build hashes, commands,
+viewport, geometry/folds and all ordered native PNG bytes in `evidence/`.
+Original private measurement scripts remain outside this repository; their exact
+hashes and actual outputs are recorded in `evidence/measurement.json`.
+
+![Fixed f254 and f266 comparison](evidence/smear50-f254-f266.jpg)
+
+Owner review receives the f240–290 H.264 video privately: full figure plus both
+flanks at 4x nearest, v3 left and v4 right; 3072x1600, 51 frames at 30 fps,
+SAR 1:1, 1,367,689 bytes. The stream and SHA-256 are in the video receipt.
+`tools/smear50-preview.py` reproduces that layout from retained v3/v4 frames;
+provide Pillow and explicit ffmpeg/ffprobe executables. Original PNGs were
+hash-checked and deleted after the sheet was read (391 per version). The small
+sheet, video receipt and native render receipts remain. Owner eye acceptance is
+pending; this record does not promote v4 or change the default.

dancer/accepted-dance/v4/evidence/measurement.json

@@ -0,0 +1,89 @@
+{
+  "spec": "dancer-smear50-measurement/1",
+  "scripts": {
+    "crops.py": "9dc426f90200d5e685f4ce79b9fdab4cdd3ec3220caf49c6dd11f98e247a398b",
+    "measure.py": "926889c5d0de5f95dafa31cbf49a9a223a33c4f137ec68c5ee50291fb763f509",
+    "meshlib.py": "caa05921a79905cdbcc0d9f5e430453889e08db879e1b830cf211b7c0ea77ded",
+    "stats.py": "b1307685be5a706d26cf19589f4635305c361f04e69f5cdfac01292b3280f69c",
+    "eval.py": "2aab0abce78e67ed498e428b6b9e485783a0cacd51cb32215041c28f4ad8b1c8",
+    "rawworld.py": "eee098da469935e36106ee3ecaac8a4da99fe5b10dfeab732d187fae794f4f20"
+  },
+  "Pillow": "12.2.0",
+  "v3": {
+    "left60": 31,
+    "right60": 13,
+    "maxL": [
+      0.978,
+      278
+    ],
+    "maxR": [
+      0.799,
+      266
+    ],
+    "f0": [
+      0.235,
+      0.101
+    ],
+    "f254L": 0.86,
+    "f266R": 0.799
+  },
+  "v4": {
+    "left60": 20,
+    "right60": 4,
+    "maxL": [
+      0.839,
+      278
+    ],
+    "maxR": [
+      0.678,
+      265
+    ],
+    "f0": [
+      0.2,
+      0.073
+    ],
+    "f254L": 0.745,
+    "f266R": 0.671
+  },
+  "bottomwearFoldFrames": {
+    "v3": 0,
+    "v4": 0
+  },
+  "v4Motion": {
+    "tipDevUnits": 0,
+    "tipDevFrame": 0,
+    "tipDevPx": 0.0,
+    "silDevPxMax": [
+      15.425045979525779,
+      279
+    ],
+    "silDevPxMean": 2.8935517237246833,
+    "f254dev": 14.665617879656104,
+    "f266dev": 13.067361493953495,
+    "peaks": {
+      "leftPeak": 253,
+      "rightPeak": 319,
+      "lowPeak": 230
+    },
+    "basePeaks": {
+      "leftPeak": 253,
+      "rightPeak": 319,
+      "lowPeak": 230
+    },
+    "setupShiftPx": 14.164224029640692,
+    "ampL": -79.80469511064244,
+    "baseAmpL": -65.2551616610527,
+    "ampR": 112.5421740000642,
+    "baseAmpR": 103.84880163626102
+  },
+  "bar3": true,
+  "framesDeletedAfterSheetReview": {
+    "v3": 391,
+    "v4": 391
+  },
+  "ownerVideoAcceptance": "pending; v3 remains default",
+  "knownShinsFoldFrames": {
+    "v3": 269,
+    "v4": 269
+  }
+}

dancer/accepted-dance/v4/evidence/smear50-v3-v4-f240-290.receipt.json

@@ -0,0 +1,38 @@
+{
+  "spec": "dancer-smear50-video/1",
+  "window": [
+    240,
+    290
+  ],
+  "fps": 30,
+  "left": "v3",
+  "right": "v4",
+  "cropBoxes": {
+    "left": [
+      220,
+      380,
+      420,
+      580
+    ],
+    "right": [
+      420,
+      380,
+      620,
+      580
+    ]
+  },
+  "scale": 4,
+  "filter": "nearest",
+  "stream": {
+    "codec_name": "h264",
+    "width": 3072,
+    "height": 1600,
+    "sample_aspect_ratio": "1:1",
+    "duration": "1.700000",
+    "nb_frames": "51"
+  },
+  "bytes": 1367689,
+  "sha256": "47660797dcc7f765e8fc22cbc978db627fa7969f89b3ee25c9f391d4ffd53d35",
+  "ffmpeg": "ffmpeg version 8.0.1-essentials_build-www.gyan.dev Copyright (c) 2000-2025 the FFmpeg developers",
+  "captionSHA256": "d8fa309a95ced3e6fb9ac4716155b77f9d92040b53453898c5a89cad0e923158"
+}

dancer/accepted-dance/v4/evidence/v3-render-receipt.json

@@ -0,0 +1,81 @@
+{
+  "spec": "dancer-smear50-render/1",
+  "version": "v3",
+  "sourceRigSHA256": "a1860937f20890818a206a2b15318eaf2bf9e253d58584976b8aa9697f73e135",
+  "sourceMotionSHA256": "46189464040b3ef8b42357399e1c8b0c1c4cbf6feedeabb24927eb09242f5aa7",
+  "build": {
+    "skeleton.json": "4e6024989f06a15525bf5cb32a47bb7aa55a75d8adf58505ce6b1a12efb49f77",
+    "skeleton.atlas": "bd9d9414f016e94407a61685455888a7aad6781acdd9d634a0a9f3c0c432cdf1",
+    "skeleton.model.json": "a94c7cbee992acaf87c0e283efc1bbd44766441f791776064e929bd59a2f0e81"
+  },
+  "commands": [
+    {
+      "label": "readers",
+      "command": [
+        "bun",
+        "<corpus>/tools/read-smear50.ts",
+        "<corpus>/node_modules/rig-c",
+        "<workspace>/hand/v3/rig.json",
+        "<workspace>/hand/v3/motion.json",
+        "<workspace>/build"
+      ]
+    },
+    {
+      "label": "build",
+      "command": [
+        "bun",
+        "<corpus>/node_modules/rig-c/cli.ts",
+        "build",
+        "--rig",
+        "hand/v3/rig.json",
+        "--motion",
+        "hand/v3/motion.json",
+        "--out",
+        "build",
+        "--profile",
+        "spine"
+      ]
+    },
+    {
+      "label": "render",
+      "command": [
+        "bun",
+        "<corpus>/node_modules/rig-c/cli.ts",
+        "render",
+        "--candidate",
+        "build",
+        "--animation",
+        "zero-two-r3-hand",
+        "--fps",
+        "30",
+        "--viewport-from",
+        "<corpus>/accepted-dance/viewport.json",
+        "--geometry",
+        "--folds",
+        "--out",
+        "render"
+      ]
+    }
+  ],
+  "frames": 391,
+  "fps": 30,
+  "viewport": {
+    "x": -575.1001332056925,
+    "y": -22.832002283065037,
+    "width": 1038.3634465496543,
+    "height": 1353.8478314199037,
+    "scale": 0.7090900304454161,
+    "pixelWidth": 736,
+    "pixelHeight": 960
+  },
+  "background": [
+    232,
+    232,
+    232,
+    255
+  ],
+  "sha256": "b75fc5696ac468f3ea9f58cc892d79389d66bf6ce7aeb31428f95350b9121029",
+  "deleted": false,
+  "geometrySHA256": "c64ec1d79ae5a62f09a67a9fed5d0aeef9b6b73a5989b57ef123ebefb3a3ee4a",
+  "foldsSHA256": "ccdba93c059893fb854cad12aff9b73e7cf6ed8d50822df420dc3927c59fec3a"
+}