# HANDOFF — 2026-11-05 (TASK 64 — green/blue screen for clips)

## State

- `main`. TASK 21 complete (video file layer + its soundtrack). TASK 64 shipped through slice E:
  a clip with a green or blue backdrop is **offered** a key on add ("Looks like a green screen —
  Remove it"), accepting it keys the background **inside the decode pipe** (bundled ffmpeg
  `colorkey`/`despill`), with Amount/Softness/Fringe in the panel and the settings persisted.
  Sessions are keyed by **path + look**, so identical looks share one decoder.
- Detection stays silent on lawns/pitches (confidence = coverage × hue tightness) and ignores
  letterbox bars. It never acts on its own.
- Tests: `ChromaKeyDetectorTests` (pure) + `ChromaKeyApplyTests` (pipe asks ffmpeg to key; offer →
  accept → keyed session feeds the resolver; survives save). App build 0 warnings; full suite green
  apart from the two documented pre-existing failures.

## Next action

- TASK 64 slice F: the **"Auto Green/Blue Screen"** opt-in setting (App Settings, high confidence
  only) and wiring alert clips to the same settings block.
- Then TASK 49 (chat profanity filter). Day 3's TASK 32/33 resilience slices remain outstanding —
  32·4 (fragmented MP4) is the smallest.
- Do not push absent a checkpoint request.

## Landmines

- `LayerReorderPersistenceTests.RealMouseDrag_OnTheLayerList_PersistsTheReorder` injects physical
  mouse input. Do not run it while the desktop is in use.
- Integration tests constructing `MainWindow` must set a temporary `LayoutPathOverride` and clear it in `finally`.
- Media sessions are keyed by **path + look** (`MainViewModel.MediaSessionKey`); never acquire by raw
  path, and release through `ReleaseMediaIfUnused`.
- Bundled FFmpeg stays outside the single-file exe (`ExcludeFromSingleFile="true"`).