Screen backdrop (schema v5/v6) + five-scene catalog + webcam polish: live desktop/game capture as a permanent non-deletable bottom layer (Source.IsBackdrop), auto full-screen game detection (Win32FullScreenDetector) else primary display, GraphicsCapturePicker re-designation, refcounted shared ScreenCaptureManager, Live-only backdrop by policy (HasBackdrop + v5-v6 backfill + EnforceBackdropPolicy, checkbox gone), SceneCatalog (Starting/Live/BRB/Chat/Ending) with + button re-adding missing scenes, webcam mid-session transparent-container fix (GetPreviewBitmap propagation), Chat half-screen-area cap, 'Add Webcam' always opens the picker (SwapWebcamIdentityAsync, no silent resurrect), WindowsRuntimeMarshal frame-read + 5s-throttled errors, docs updated, tests (65 passing)

TASKS.md

@@ -159,7 +159,7 @@ Preview shows the transition too (WYSIWYG). No wipes/slides/LUTs beyond the four
    - **Scenes list:** drag rows to reorder scenes
    - **Sources list:** drag rows to reorder sources (this *is* the z-order) — implemented
 
-### Status: 🔶 In progress — milestone 1 (webcam) shipped; **schema v3 (Ship Branch A) shipped**: multi-scene webcam (singleton `Webcam` + per-scene `WebcamSceneConfig`), right-click border/context menu, static OSB-style borders, 50%-per-dimension webcam size cap, device-swap (`ReleaseAllAsync`); **schema v4**: round→rect restore persisted (`WebcamSceneConfig.RectWidth`/`RectHeight`) + one-time legacy-square 16:9 heal on load — 25 tests passing; scenes/sources UI (add/reorder/rename, image + background overlays with move/resize/opacity/reuse) built; screen capture, compositing, encoding pending
+### Status: 🔶 In progress — milestone 1 (webcam) shipped; **schema v3 (Ship Branch A) shipped**: multi-scene webcam (singleton `Webcam` + per-scene `WebcamSceneConfig`), right-click border/context menu, static OSB-style borders, 50%-per-dimension webcam size cap, device-swap (`ReleaseAllAsync`); **schema v4**: round→rect restore persisted (`WebcamSceneConfig.RectWidth`/`RectHeight`) + one-time legacy-square 16:9 heal on load — 25 tests passing; **screen backdrop (ship task #1) shipped**: live desktop/game capture as a permanent, non-deletable bottom layer (`Source.IsBackdrop`, schema v5), auto-detecting the full-screen game at launch/focus (else the **primary display** — never assumed monitor 0) via `Win32FullScreenDetector` (now with `GetDisplays()`/`PrimaryMonitorIndex()` for the in-app display picker), content re-designated via the OS `GraphicsCapturePicker` ("Change Capture…") or the in-app "Capture Display" submenu, refcounted/shared capture sessions in `ScreenCaptureManager` mirroring `CameraManager` — 45 tests passing; **schema v6**: `Scene.HasBackdrop`, now **Live-only by policy** — the backdrop is enforced by scene name on every load (`EnforceBackdropPolicy`: Starting/BRB/Chat/Ending never carry one; the one-time v5→v6 backfill covers all four), the scene context-menu "Backdrop" checkbox is gone (policy owns the flag), preview watermark hides when the backdrop renders, capture changed to `WindowsRuntimeMarshal.TryGetDataUnsafe` (the CsWinRT-safe frame-read) + downscale to the 1920×1080 master + 5s-throttled error logging (was flooding `startup.log` with 5 MB of cast errors and burning CPU), round webcam no longer re-rasterizes an `ImageBrush` every frame (Image + EllipseGeometry clip) — the live-mode stutter fix; **the five-scene catalog (`SceneCatalog`)**: Starting/Live/BRB/Chat/Ending is the product — work with less, never more; the (+) button only shows when a canonical scene is missing and re-adds it (its menu lists only the missing ones); **webcam-after-session-start fix**: a webcam added to a scene after the camera was already running (e.g. Chat) previously rendered a transparent container — `CameraManager.GetPreviewBitmap` + propagation in `AddWebcamToActiveSceneAsync`/`ReacquireWebcam` now hands the running shared frames to any newly added `WebcamSceneConfig` — 62 tests passing; the **Chat scene's webcam size cap** is raised from 50%-per-dimension (960×540) to half the screen AREA (~1358×764 @16:9, `MaxWebcamWidthFor`/`MaxWebcamHeightFor` keyed by canonical name) so the viewer sees the creator better — 65 tests passing; **"Add Webcam" always opens the camera picker** (deleting one scene's webcam then re-adding used to resurrect the old camera when another scene still used it — `SwapWebcamIdentityAsync` now swaps the app-wide identity if a different camera is chosen, same path as "Change Webcam…"); scenes/sources UI (add/reorder/rename, image + background overlays with move/resize/opacity/reuse) built; window capture, compositing, encoding pending
 
 ---
 
@@ -178,10 +178,11 @@ Preview shows the transition too (WYSIWYG). No wipes/slides/LUTs beyond the four
    - **1080p60 @ 8 Mbps** (default — mainstream ceiling, GPU hardware-encoded so the gaming
      machine never notices; upload headroom stays comfortable)
    - Vertical 1080×1920 @ 60fps @ 8 Mbps (9:16 phone tier)
-   - 1440p/4K = the paid unlock tiers (monetization), not the standard offering
    The composition master is always 1920×1080; a tier is an output rect + target resolution
    (see `ai.md` "Resolution tiers"). Vertical output = the centered 607×1080 crop of the master
    scaled to 1080×1920 (semi-crop preview is already implemented; the encoder applies the same rect).
+   1080p60 is the ceiling by design — "if you want 1440 or 4K or 8K → OBS is your solution"; the app
+   targets the most mainstream creator, not power users.
    Ladder is sculpted by a **cached probe** (IP-only TCP vs public ingest host; no auth required).
    Quality is greyed out while live because the declared resolution can't change mid-stream — but
    with `variable`, we can **auto step-down** bitrate/resolution on the fly with zero API calls
@@ -237,15 +238,20 @@ Preview shows the transition too (WYSIWYG). No wipes/slides/LUTs beyond the four
    **Save Layout As… / Open Layout…** switch the active file; auto-save writes to whatever is active.
 4. **Auto-save (invisible)** — ~1.5s debounce on scene add/remove/reorder/rename/hide, source
    add/remove/reorder, and any source transform change; flush on window close.
-5. **Schema** — `Scene` (Id, Name, IsHidden, IsChatScene, SortOrder), `Asset` (Id, Hash, Data,
+5. **Schema** — `Scene` (Id, Name, IsHidden, IsChatScene, HasBackdrop, SortOrder), `Asset` (Id, Hash, Data,
    PixelWidth, PixelHeight), `Source` (Id, SceneId FK cascade, AssetId FK, Type, Name, IsEnabled,
    X/Y/Width/Height/Opacity, MonitorIndex, DeviceId, ClipShape, IsMirrored, SortOrder) —
-   `user_version` **4** (v1 → v2 = `ALTER TABLE` adds the two webcam columns; v3 = singleton
+   `user_version` **6** (v1 → v2 = `ALTER TABLE` adds the two webcam columns; v3 = singleton
    `Webcam` + per-scene `WebcamSceneConfig`; v4 = `WebcamSceneConfig.RectWidth`/`RectHeight` for the
-   round-to-rect restore). `WindowHandle` stays in-memory (per-session). Save = transactional
-   rewrite; orphaned assets pruned.
-6. **Startup** — load the active file; seed the default five scenes (Starting/Live/BRB/Chat/Ending)
-   only when the DB is empty.
+   round-to-rect restore; v5 = `Source.IsBackdrop` + `Source.CaptureKey` for the live-capture
+    backdrop; v6 = `Scene.HasBackdrop` — the backdrop is **Live-only by policy**
+    (one-time backfill turns Starting/BRB/Chat/Ending off and drops their backdrop
+    sources; `EnforceBackdropPolicy` re-normalizes every load). `WindowHandle` stays in-memory
+    (per-session). Save = transactional rewrite; orphaned assets pruned.
+6. **Startup** — load the active file; seed the five canonical scenes
+   (Starting/Live/BRB/Chat/Ending, `SceneCatalog`) only when the DB is empty. The (+)
+   button re-adds a missing canonical scene and is hidden once all five are present;
+   adding beyond the five is rejected — work with less, never more.
 
 ### Status: ✅ Implemented