9ae240b0 committed its tests and its documentation and none of its
implementation: four files instead of twelve. The `git add` that should have
staged the rest named a pathspec for requirements-acestep.txt, which did not
exist, so git refused the whole invocation and I did not check its output
before committing. The message described work that was not in the tree, and
the suite at that commit could not have passed.

This is that work:

* video.py — LTX-2.x gets its own pipeline classes. This diffusers has
  LTX2Pipeline, LTX2ImageToVideoPipeline, a video AND an audio VAE, but only
  the LTX 0.9 family was mapped, so every LTX-2 entry in models.json sat
  parked: the name matched and the class did not. Split on the version in the
  name, since both families are just called "LTX" and a fine-tune keeps its
  base version (10Eros is LTX2.3, PinkCherry is LTX23).

* hf_loading.py — `civitai:<modelVersionId>` references, and a GGUF component
  that fails to load now fails the load instead of being skipped. A skipped
  component is simply absent from the dict, so the base pipeline loaded its
  own full-precision copy: the operator asked for a 14 GB quantized
  transformer and got a 38 GB bf16 one, while the VRAM estimate still said
  14 GB and the planner therefore freed about a third of what the load needed.

* presenter.py — LatentSync and MuseTalk as first-class engines, ahead of
  wav2lip for a clip (wav2lip works at 96x96 and upscales, which is the soft
  mouth on a 1080p reel). Both are video-driven, so sadtalker still leads for
  a still portrait. Recognised from a shim on PATH or a managed install whose
  weights are already present — never "could be downloaded", because a compose
  job is the wrong place to fetch 5 GB.

* cache/__init__.py + app.py — the loop stall. scan_cache_dir is not a
  listing: it stats every blob of every revision of every repo, measured at
  27.3 SECONDS on this machine's 900 GB cache, and it was called from a
  per-model VRAM estimate, a GGUF path lookup and a POLLED endpoint, all on
  the event loop. 6631 stalls over 0.5s, worst 13.0s, serving nothing. Both
  halves were needed: memoised for 30s (short enough that a model downloaded
  while the server runs still becomes visible) and the poll moved to
  asyncio.to_thread, since memoising alone still puts the first 27-second call
  on the loop.

* manager.py — /v1/models reads `modes` from a video entry's long-standing
  `video_subtypes` as well as the newer spellings.

* requirements-acestep.txt — the file whose absence caused this. It is marked
  NOT YET INSTALLED, because it is: the install was refused as external code,
  nothing in it has been run, and the audio_gen loader refuses an ACE-Step
  model explicitly rather than mis-loading it as a MusicGen.

Suite: 15 failed, 5194 passed — the same 15 as the baseline.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014T3rZnmWyKjWZerwsb27jZ