Zoom: compose the box as a real 2x layer above the background (Unit: zoom layer + magnification proof)

Right-click now creates a transient ZoomSceneElement at z-index 1 whose pixels are a
genuine 2x magnified sample of the backdrop (live capture under art), composited into
stream/recording like any layer while the output crop stays the tier. All shapes are
centered on the click and clamped to frame; healed on load/scene-create, never persisted,
hidden from the layers list + element template (IsZoomLayer). BuildCompositorOptions is
now internal = always tier crop (test seam). ZoomFrameBuilder is a pure static sampler
(box/2 window centered on the box center, single-slot cache) proven by a banded-backdrop
test; LayerReorderPersistenceTests drag resolves rows by item since the collapsed zoom
row shifts container indices. Also books TASK 51 (webcam background Remove + Blur) and
syncs memory docs (HANDOFF, MyMistakes, indexes). Full suite: 405 passed, 0 warnings.

TASKS.md

@@ -66,6 +66,7 @@
 | 48 | Distribution & packaging: **MSIX + Store IAP** | 🔶 In progress — **✅ route decided 2026-09-27 (Store MSIX + Store IAP)**; **item 1 (bundle ffmpeg) SHIPPED 2026-09-28** | [`TASKS/task-48-distribution-msix.md`](TASKS/task-48-distribution-msix.md) |
 | 49 | Chat profanity filter (local, opt-in, non-persistent, user word list) | ☐ Queued (2026-09-27) | [`TASKS/task-49-chat-profanity-filter.md`](TASKS/task-49-chat-profanity-filter.md) |
 | 50 | One-button "Publish this video" (resumable upload of the local recording) | ☐ Queued (2026-09-28) | [`TASKS/task-50-publish-recording.md`](TASKS/task-50-publish-recording.md) |
+| 51 | **Webcam background effects: Remove + Blur** | ☐ **v1 requirement** — booked 2026-10-08; queued behind the zoom build | [`TASKS/task-51-webcam-bg-effects.md`](TASKS/task-51-webcam-bg-effects.md) |
 
 ---
 
@@ -177,7 +178,9 @@ second encoder path needing a "redirect". Record+simulcast is one ffmpeg with tw
     exclusive camera lock.** API probe already done — see HANDOFF.md, incl. the `SetFormatAsync`
     dead end.
   - ⛔ **No fallback-camera feature, ever** — *"that's bypassing the user's explicit choice."*
-  - ⛔ **No background removal** — re-affirmed out 2026-10-05.
+  - **Background removal + blur = v1 requirement (2026-10-08)** — reverses the 2026-10-05
+    exclusion. Bundled ONNX + onnxruntime, no downloads, no GPU requirement. Per-element
+    Remove/Blur + strength. See [`TASKS/task-51-webcam-bg-effects.md`](TASKS/task-51-webcam-bg-effects.md).
 - **TASK 40 — App Settings round** — plan saved 2026-09-22 (`TASKS/task-40-app-settings-round.md`),
   four units, one Good Dog test each: **A** active web camera section under Recordings (Change…
   sub-menu = live enumeration incl. vcams; Tune… config dialog via `ICameraControlProbe`, live-only
@@ -379,9 +382,12 @@ See [`TASKS/research-youtube-api.md`](TASKS/research-youtube-api.md) — authori
 These were explicitly ruled out:
 
 - **D3D11 swap compositor** (superseded by software compositor; TASK 3 item 16)
-- **Background removal** (ONNX/DirectML; TASK 3 item 19) — ⛔ **re-affirmed out 2026-10-05**: *"no - not
-  doing it. the note is correct and accurate."* A vcam app does it free; an in-app model is a runtime,
-  a GPU/driver matrix, and per-scene lighting tuning. **Never reopen without a new ruling.**
+- **Background removal + blur** (ONNX/DirectML; TASK 3 item 19) — ⛔ ruled out 2026-10-05
+  (*"no - not doing it... a vcam app does it free; an in-app model is a runtime, a GPU/driver
+  matrix, per-scene lighting tuning"*). **REVERSED 2026-10-08 — now a v1 requirement**
+  ([`TASKS/task-51-webcam-bg-effects.md`](TASKS/task-51-webcam-bg-effects.md)): bundled
+  ~2–5 MB ONNX model + onnxruntime, CPU-capable, no downloads, no NVIDIA. NVIDIA VFX SDK
+  (~1 GB per-client redistributable, RTX 2000+) remains ruled out.
 - **OBS-style source expansion** (game capture, browser source, media playlist, VLC, color-key, MIDI — the minimal source set is deliberate; creators who need more have graduated to OBS)
 - **Multi-layout** (auto-save, single layout; multi-layout = OBS territory)
 - **Cross-process stream resume** (API makes it impossible; creator ruling 2026-09-01)