v0.12.0

A cold-start release. Opt in and a quantized model's second cold load
skips the bf16 read and the quantize: MiniMax H3 loads in 19 s instead of
113 s on an RTX 3090. The caches that build up on a server's disk now have
a page, and the music-video cut planner stops treating Whisper's
hallucinations as lyrics.

Quantized-component cache (#815, #825, #826, #827)

• DW_QUANTIZED_CACHE=1 keeps each SDNQ on-the-fly-quantized component on
  disk (safetensors plus JSON, under <HF_HOME>/dw-quantized or
  DW_QUANTIZED_CACHE_DIR) and reads it back on the next load of the same
  key. Measured on an RTX 3090: H3 cold 112.7 s -> 18.7 s, warm 67.5 s ->
  4.0 s. An H3 configuration holds about 43 GB.
• It covers a modular pipeline's load_components (H3) and a component
  loaded on its own through from_pretrained (LTX-2.5's transformer and
  its Gemma text encoder, saved under their own tensor names so they load
  back). A hit is placed on the config's return_device.
• The key pins the snapshot commit, the quantizer config and the sdnq,
  diffusers, transformers and torch versions; a save is refused when it
  would leave less than min(50 GiB, 10%) free, and a quantized_cache
  job event names every hit, miss, save and skip with its reason. The cache
  never fails a job. Off by default; docs/QUANTIZATION.md has the details.

Disk caches (#828, #832, #833, #834, #837)

• GET /api/caches lists dw's caches of derived data - inductor
  (torch.compile kernels), triton (SDNQ's jit and autotune kernels)
  and quantized - with size, files, last use and the volume's free
  space; DELETE /api/caches/{name} clears one, refused while a job runs
  or a download is active. The quantized cache lists its entries and
  DELETE /api/caches/quantized/entries/{id} removes one.
• The web UI's Server page has a Caches panel for the same, asking before
  a clear and quoting what the clear costs. get_server_info carries the
  list for an agent.

Transcription and cuts (#822, #823)

• music-video-cuts transcribes the vocal stem rather than the full mix,
  so an instrumental intro no longer folds into the first word. Chunks
  that are silent, overlong, wordless or a repetition loop are marked
  suspect; plan_cuts leaves them out and warns once per run.
• get_gallery_metadata's envelope takes interval_seconds (0.05 to
  3600, default 1.0) so an agent can place a cut to a frame. More than
  2400 bins is refused unless the default interval would give more.

Fixes

• The inherited cost estimate is withheld when an inline workflow runs
  more steps or frames than the template it came from, instead of
  quoting the template's number (#821: a 7x under-quote).
• assess_output shot findings carry index and start_frame, so a
  repeated shot name is unambiguous (#835).
• dialogue-short and music-video expose match_levels_dbfs (#836).
• A default cache root that appears after the server starts is marked,
  so triton stays clearable after the first run (#837).
• deploy.sh restarts a dw.serve run as a loaded launchd daemon on
  macOS.
• A component's attention_backend pin stays on that component. diffusers
  also made it the process-wide default, so after an H3 run with
  attention_backend=sage_hub the worker sent every later model through
  sage, and Music3 failed with Unsupported head_dim: 256 (LTX's attention
  mask is refused the same way). Music3 and LTX templates need no pin of
  their own.