HANDOFF — 2026-10-09 (TASK 51 webcam background Remove + Blur — BUILT)

Branch

main (no feature branch). Pushed through f8dd107; everything after is local, not pushed (push at the creator's call).

The in-flight "pinned chat" work unit: Models/YouTube.cs, ViewModels/MainViewModel.Chat.cs, untracked Helpers/RelayCommandGeneric.cs, and its hunks in Controls/LeftPanel.xaml (lines ~599–610, the chat area). TASK 51 slice 5 edited the SAME file in a different region (the webcam properties, ~line 287); only the TASK 51 hunk was staged (git apply --cached of that hunk alone) — the pinned-chat hunks are still unstaged and untouched.
The creator's untracked logo art in Assets/ (llamacasty text.*, llamacasty-text-nobg*.png, thin logo wordmark.png).

Engine — Google's MediaPipe Selfie Segmenter (landscape, Apache-2.0) converted to ONNX by tools/selfie-seg/ and verified vs MediaPipe's own runtime; embedded resource; onnxruntime CPU.
Blur — background at ¼ res, 3 box passes, mask-blended; Remove gets edge feather.
Config — WebcamSceneConfig.BackgroundEffect + BackgroundStrength, persisted (additive cols).
Hookup — CameraManager renders per-scene effect variants (one segmentation per raw frame on a latest-frame-drop worker; raw path untouched); VM SyncWebcamEffects() declares/adopts them. Synthetic 720p Debug: segment 1.6 ms, Remove 3.3 ms, Blur 17.5 ms.
UI — Background section in the webcam's Layers properties: Remove / Blur PillToggles, radio-exclusive, + Strength slider (visible while an effect is on). Also this session: 64-bit requirement (PlatformTarget=x64), GPL-3.0-or-later licensing, README rewrite, TASK 55 (disk hygiene) + TASK 56 (secret scan before going public) queued.

Full suite 412 passed / 0 failed, 0 build warnings. New: BackgroundEffectEngineTests (Remove, Blur, bundled-model contract), CameraManagerTests (variant reaches compositor + preview, raw stays raw), LayoutStorePersistenceTests (per-scene roundtrip + legacy migration), WebcamBackgroundPillTests (radio semantics + XAML wiring).
Known environment flakes (not regressions): Mix_HonorsProviderGains… (fails while system audio plays), RealMouseDrag… (needs an idle desktop).

Creator's real-camera check (TASK 51): toggle Remove/Blur on a webcam, watch edges/lighting, and read startup.log → "background effects avg … ms/frame".
onnxruntime.dll ~17 MB; TASK 48's MSIX publish must pin -r win-x64 (x64-only already enforced).
Still stale, not rewritten: ai.md "Windows packaging" (Store IAP / branding-flash paid delta) and "Monetization" sections; MARCOM.md asset table (llama-logo.png doesn't exist).
TASK 56: secret-scan the full history BEFORE the Gitea repo (gramps/LlamaCasty) goes public.
Carried: "Use default background" toggle still not working (from 2026-10-07).

Creator runs the app: webcam → Layers properties → Background → Remove / Blur + Strength.