# HANDOFF — 2026-10-09 (TASK 51 slice 1 shipped: background-effects engine)

## Branch
- main (no feature branch). Pushed through `f8dd107`; the TASK 51 slice-1 commit sits on top,
  **not pushed** (push at the user's call).

## Dirty files (NOT mine — do NOT commit or co-edit)
- The in-flight "pinned chat" work unit: `Models/YouTube.cs`, `ViewModels/MainViewModel.Chat.cs`,
  `Controls/LeftPanel.xaml`, untracked `Helpers/RelayCommandGeneric.cs`.
- The creator's untracked logo art in `Assets/` (`llamacasty text.*`, `llamacasty-text-nobg*.png`,
  `thin logo wordmark.png`).

## What just happened — TASK 51 slice 1 (engine)
- **Model:** Google's official MediaPipe Selfie Segmenter (landscape, 144×256, Apache-2.0),
  converted to ONNX by our own `tools/selfie-seg/convert_tflite_to_onnx.py` and **verified against
  MediaPipe's own runtime** (`verify_against_mediapipe.py`, max |diff| 5e-5). Embedded in the exe
  (`Assets/Models/selfie_segmenter_landscape.onnx`, 430 KB, in git).
- **Code:** `Services/BackgroundEffects/` — `IPersonSegmenter` seam, `OnnxPersonSegmenter`
  (onnxruntime 1.31.0 CPU, never throws), `BackgroundEffectProcessor` (None passthrough, Remove =
  alpha mask, Blur = passthrough until slice 2). `Models/BackgroundEffect.cs` enum.
- **Not wired:** nothing calls it yet — no config, UI, or camera hookup. Zero risk to the live path.
- **Docs:** ai.md (stale "background removal PERMANENTLY OUT" bullet replaced by the reversal + a
  "Webcam background effects" section + a model-provenance licensing guard), THIRD-PARTY-NOTICES
  items 11 (ONNX Runtime, MIT) + 12 (MediaPipe model, Apache-2.0 with §4b change note),
  TASK 51 file + TASKS.md row, Services/Models indexes, MyMistakes conversion recipe.

## Tests
- Full suite **408 passed / 0 failed**, 0 build warnings. New: `BackgroundEffectEngineTests` (Remove
  integration test with a fake segmenter; bundled-model contract test vs a MediaPipe reference mask,
  fixtures in `ytLive.Tests/Fixtures/`).

## Known issues / follow-ups
- **64-bit only (2026-10-09):** `PlatformTarget=x64` in both csproj files (verified: ytLive.dll PE
  machine 0x8664, 408/408 green). TASK 48 item 2 carries the x64-only MSIX + `-r win-x64` publish.
- `onnxruntime.dll` is ~17 MB; an RID-less build copies every RID's native folder — TASK 48's MSIX
  publish must pin win-x64.
- `THIRD-PARTY-NOTICES.txt` + ai.md Licensing now say **GPL-3.0-only** (2026-10-09: `LICENSE`,
  `ADDITIONAL-TERMS.md` with §7 b/c/e, icon+logo all rights reserved, README License section; both
  files ship beside the exe). **Still to do when the repo goes public:** add the public repo URL
  (source offer) to the notices header + README; scan git history for secrets first. Still stale
  and NOT yet rewritten: ai.md "Windows packaging" (Store IAP / branding-flash paid delta) and
  "Monetization" sections, MARCOM.md asset table (`llama-logo.png` doesn't exist), README's
  "Why ytLlive" OBS comparison (breaks the no-comparison copy rule once public).
- Carried: "Use default background" toggle still not working (from 2026-10-07).

## Next step
- TASK 51 slice 2: **Blur** in `BackgroundEffectProcessor` (separable box/gaussian, strength), one
  integration test. Then slice 3 config + persistence, slice 4 camera-path hookup + perf check on the
  creator's box, slice 5 properties-panel UI.