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docs(memory): split capture (backdrop, webcam, effects, vertical tier) out of ai.md

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Unit 2 of slimming the mandatory read. Verbatim move again - the four capture
blocks leave ai.md unchanged in content, and one stub carries the law.

- docs/ai/capture.md: 'Screen backdrop capture', 'Webcam capture', 'Webcam
  background effects' and 'Vertical (9:16) tier camera placement', byte-
  identical, grouped under backdrop / webcam / vertical headings, with a
  'Related in ai.md' footer.
- ai.md stub keeps: the locked-Background model and NormalizeBackgrounds;
  ActiveBackgroundImage is fed by static art only (2026-08-23 regression);
  window:/picker: keys are session-scoped and a live pin beats auto-detect;
  the settled WinRT interop paths (TryGetDataUnsafe, from-DXGIDevice); the
  VideoFrame seam, own-catch subtype ladder and no fallback camera; one app-
  level webcam identity with live-lock attainability; CameraManager as the one
  effects processing point with per-session mask smoothing; geometry-only
  vertical tier and the model-level rect lock.
- docs/ai/index.md gains the capture.md row; Services/index.md (2) and
  TASKS/task-38-window-backdrop.md repointed.

ai.md 1,975 -> 1,558 lines. No source touched; no push.
This commit is contained in:
gramps
2026-10-26 10:26:53 -07:00
parent 804b1d2f5f
commit 096bf6debe
5 changed files with 521 additions and 453 deletions
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docs/ai/index.md
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@@ -10,6 +10,7 @@ Read the file whose row matches the task. There is no required reading order.
| File | Covers | Read when |
|------|--------|-----------|
| [`frame-pipeline.md`](frame-pipeline.md) | Render budget & measurement (`FrameCadence`, per-element composite timing, scene dump), `SceneCompositor` design + `StripPool`, and `FramePump` from scene snapshot to encoder (pacing, pool/paste caches, backpressure, teardown, health stats) | Touching the compositor, the render loop, per-frame cost, `Services/Encoder/*`, or debugging dropped/juddering frames |
| [`capture.md`](capture.md) | The locked Background layer (screen/game/window capture, WinRT GraphicsCapture interop), the webcam seam + `CameraManager` sessions, MediaPipe background effects, and the vertical 9:16 tier's per-scene camera placement | Touching any frame source, the Background row, camera acquisition/conflicts, background effects, or vertical-tier camera geometry |
## Split-out yet to come