# Lane C log — append-only, newest at bottom

Format per session:

    ## <date> session N
    DONE: …
    DECISIONS: …
    BLOCKED/REQUESTS: …
    NEXT: …

## 2026-07-18 session 1
DONE: M1 code-complete. Commit bb85eef.
- `requirements.txt` (fastapi, uvicorn only); `.gitignore` += `.venv/`.
- `scenegod/server.py` single file: statics (`/` no-store placeholder,
  `/web/{path}` short-cache, path-guarded), `/assets/tree` (5s cache,
  per-category grouping), `/assets/file` (traversal-guarded), `/scenes`
  CRUD with atomic write + slugify + `validate_scene`, render endpoints
  (begin/frame accept + save; end/status/out 501 until M3).
- `scripts/test_server.py`: 5 groups green (tree grouping, file stream,
  4 traversal attempts rejected, scene round-trip w/ slugify, 5 validation
  failures + 1 fade-overlap-allowed). `OK: 5 test groups passed`.
DECISIONS:
- System python3 is 3.14 (fastapi present but pydantic missing); made a
  `.venv` on python3.11 per CLAUDE.md stack rule. Tests + server use
  `.venv/bin/python`. `.venv/` gitignored.
- `web/` is under `scenegod/web/` per PLAN §2 (not repo root) — `WEB`
  points there; Lane A/B statics resolve via `/web/{path}`.
- Asset grouping: per-category primary ext set (models for chars/anims/
  props, images for backdrops, audio for audio). Non-primary image sharing
  a stem → `thumb`, not a `format`. `path` prefers glb else first model.
  Entries with no primary format dropped (thumb-only stems aren't assets).
- Clip-overlap check: violation if `next.start < a.end - a.fade`, where
  `a.end = start + (out-in)*loop`. Fade-region overlap allowed.
BLOCKED/REQUESTS: none.
NEXT: M2 (when unlocked): scene-validation hardening + asset thumbnails
endpoint. M3 render pipeline (ffmpeg encode + web/render.js) is designed in
C-server.md §C5, endpoints already stubbed — implement at SYNC-2/M3.

## 2026-07-18 session 2
DONE: M2 thumbnails + M3 render pipeline (orchestrator green-lit both). Commit b627a0f.
- `/render/begin` (uuid dir + meta.json, 503 if no ffmpeg), `/frame/{n}`
  (PNG->frames/{n:06d}.png, 400 on empty), `/end` (spawns bg ffmpeg thread:
  libx264 crf18 yuv420p, 400 if no frames), `/status` (queued|encoding|
  done|error+log tail; on-disk out.mp4 fallback after restart), `/out.mp4`.
- Boot-time `reap_renders()` deletes render dirs >48h.
- `/assets/thumb?path=` serves same-stem image sidecar (404 if none).
- `web/render.js`: draftRecord (MediaRecorder webm), finalRender
  (timeline.step -> renderActiveCamera -> toBlob -> POST, <=4 in flight,
  resize+restore renderer), download() helper. node --check clean.
- `test_server.py`: added render group (ffmpeg lavfi -> 30 PNGs -> begin ->
  post -> end -> poll -> ffprobe duration ~1s) + thumbnail asserts.
  `OK: 6 test groups passed`.
DECISIONS:
- Render state in-memory (single-process local tool); status() infers from
  disk after a restart. ponytail-commented.
- Thumbnails pass-through, no resize — Pillow would be a new dep (stack rule
  says log a REQUEST first); not worth it until dock load is measurably slow.
- finalRender total frames = round(duration*fps); relies on timeline.step
  being deterministic (orchestrator verified).
BLOCKED/REQUESTS:
- finalRender's per-frame path depends on Lane A `stage.renderActiveCamera`
  as a real render target (their M2). Server + ffmpeg path fully tested with
  synthetic frames; the browser client path is unexercised until A lands it.
NEXT: M4 is locked. When unlocked: ffmpeg audio mux (scene audio[]),
/mb/submit MODELBEAST proxy, scripts/graft_limb.py. Meanwhile available to
integration-test finalRender once Lane A's renderActiveCamera lands.

## 2026-07-18 session 3
DONE: M4 complete (unlocked after SYNC 3). Commit be65355.
- Audio mux: `/render/end` now accepts `{audio:[{path,start,gain}]}`, muxes via
  ffmpeg adelay+volume+amix -> aac -shortest; audio paths path-guarded (400 on
  missing). `render.js finalRender` passes `opts.audio` through.
- `scripts/graft_limb.py`: headless Blender (`blender -b -P ... -- --body B
  --limb L --bone NAME --out O`). Align limb root head->target bone world head,
  join armatures, parent limb root under target (keep offset), join meshes
  (vgroup weights survive). Refusal: overlapping bones -> GraftRefused ->
  exit 2 "re-skin, don't graft". No finish/decimate. `--selftest` builds
  synthetic body/limb GLBs and verifies refusal + graft paths under Blender.
- `/mb/submit`: MODELBEAST proxy, SCENEGOD_MB=1 gated (503 otherwise), token
  from ~/Documents/backnforth/.env at request time (never logged; errors
  scrub it), /api/assets multipart -> /api/jobs, mirrors meshgod/ops.py.
- `test_server.py`: 8 groups green (added audio-stream assert, MB gating,
  MB two-step contract via in-process mock — no farm jobs).
DECISIONS:
- Blender 5 glTF importer injects a stray unparented 42-vert icosphere on
  every import; `_import` now keeps only rig-connected meshes (parented to
  armature / has vgroups / armature modifier) and deletes strays. Right filter
  for a graft tool regardless.
- graft refusal check: provides = limb bones - {limb root}; refuse if
  provides ∩ body bones. Attach/root bone sharing the target name is expected.
- MB test uses a stdlib http.server mock + a 2nd scenegod instance; asserts
  Bearer token forwarded, multipart upload, asset_id chained into job payload.
BLOCKED/REQUESTS: none.
BACKLOG (from orchestrator, not urgent): draft webm via MediaRecorder is
untested in the embedded preview (rAF suspension). Needs one verification in a
real Chrome window before calling draftRecord done — client-only, needs Lane A
stage running live; deferred.
NEXT: Lane C M1-M4 all shipped. Available for polish / integration support.
Blender binary here is /Applications/Blender.app/Contents/MacOS/Blender (not
on PATH as `blender` in this session, contrary to orchestrator note).

## 2026-07-18 session 3b
DONE: optional item from orchestrator — `/rhubarb?path=` endpoint. Commit fb59601.
- `GET /rhubarb?path=` (path-guarded) -> `rhubarb -f json <wav>` -> returns
  `{metadata, mouthCues:[{start,end,value}]}` for Lane A's viseme lane.
  503 with install hint when the binary is absent (ffmpeg-style gate).
- test_server.py: +503-when-absent assert (9 groups green).
DECISIONS: synchronous subprocess (VO clips are short); rhubarb NOT installed
on ultra, so only the 503 path is exercised here — happy path (JSON parse) is
untested until `rhubarb` is on PATH. Flagged same as MediaRecorder backlog.
BLOCKED/REQUESTS: none. To fully verify: install rhubarb-lip-sync on ultra,
then GET /rhubarb?path=audio/<some>.wav.
NEXT: nothing outstanding — Lane C M1-M4 + rhubarb shipped. Standing by.