v1 task queue: add TASK 19-23 (transitions, hotkeys, media source, audio sync, studio mode)

- TASKS.md: added 5 new tasks for v1 feature completeness, execution order, updated backlog
- MONETIZATION.md: added v1 feature completeness section (competitive gap analysis)
- ai.md: added v1 task queue note in Current limitations/TODOs
- HANDOFF.md: updated session state and next steps
- ViewModels/SocialsDialogViewModel.cs: removed isPremium parameter (social slot locks)
- ViewModels/MainViewModel.cs: removed isPremium argument from SocialsDialogViewModel constructor
- ytLive.Tests/SocialsDialogViewModelTests.cs: updated 5 tests for unlocked slots

ai.md

@@ -1,8 +1,10 @@
 # ytLlive — AI Guide
 
 > Memory map entry point. Conventions live in [`schema.md`](schema.md); task
-> status and YouTube API research in [`TASKS.md`](TASKS.md); directory maps in
-> each folder's `index.md`. Reading order: this file → `TASKS.md` → `<dir>/index.md` → source.
+> status and YouTube API research in [`TASKS.md`](TASKS.md); brand/marketing
+> palette and launch strategy in [`MARCOM.md`](MARCOM.md) (gitignored — read
+> it before any branding or marketing work); directory maps in each folder's
+> `index.md`. Reading order: this file → `TASKS.md` → `MARCOM.md` → `<dir>/index.md` → source.
 
 ## Response style
 
@@ -25,6 +27,20 @@ of reassurance. In that mode:
 This is an occasional, explicitly-invoked mode — **never the default**. The
 default response style above stays in effect unless invoked.
 
+## Brand
+
+Brand palette and official assets live in `MARCOM.md` (gitignored — read it for hex values,
+asset file names, and marketing copy). The brand red `#e94560` is the primary accent used
+throughout the UI.
+
+### AI transparency
+
+This project is built through AI-assisted pair-programming. All code is generated
+under the supervision of an experienced developer with decades of coding experience.
+Architecture decisions, product direction, and quality gates are human-owned;
+AI accelerates implementation. This is a testimonial to successful human-AI
+collaboration, not autonomous code generation.
+
 ## Run
 
 ```bash
@@ -113,9 +129,16 @@ C# / WPF (.NET 8) following MVVM:
 
 - `Helpers/OAuthCredentials.cs` contains the real ClientId/ClientSecret. Auth is complete and the session **persists via Windows DPAPI** (`Helpers/TokenStore.cs` → `%APPDATA%\ytLlive\ytLlive.auth`, CurrentUser scope), reloaded best-effort at startup with a proactive refresh of a near-expiry access token. Sign-in/Change Account lives **inside the Start Stream dialog** (two-state flow — no separate Connect button). A **graceful End Livestream signs out**: `StopStream()` clears the session + token, so the next go-live needs a fresh sign-in; a crash never runs End, so the token survives and the creator stays signed in. `YouTubeAuthService` takes an optional `HttpClient` + `sessionChanged` callback (test seam + save hook; services are still constructed in `MainViewModel`)
 - Scene/source/asset layout + the social bar persist (SQLite, schema v8); the OAuth session persists (DPAPI); the paid-unlock state does not (yet — subscription entitlement verification pending, TASK 10)
-- `YouTubeStreamService` manages the **variable reusable stream** (shipped 2026-08-16): `GetOrCreateReusableStreamAsync` lists `liveStreams?mine=true` and reuses the existing `cdn.isReusable` stream, creating it only on first use (`resolution=variable`, `frameRate=variable`); the stream is cached via `LayoutStore` (`SaveReusableStream`/`LoadReusableStream`, Settings table) and bound at broadcast insert (`contentDetails.boundStreamId`). Health (shipped 2026-08-16): `GetStreamHealthAsync(streamId)` polls `liveStreams?part=status` for `healthStatus` + `configurationIssues[]` → `StreamHealth`; banner decision in pure `StreamHealthReporter`
+- `YouTubeStreamService` manages the **variable reusable stream** (shipped 2026-08-16): `GetOrCreateReusableStreamAsync` lists `liveStreams?mine=true` and reuses the existing `cdn.isReusable` stream, creating it only on first use (`resolution=variable`, `frameRate=variable`); the stream is cached via `LayoutStore` (`SaveReusableStream`/`LoadReusableStream`, Settings table) and bound at broadcast insert (`boundStreamId`). Health (shipped 2026-08-16): `GetStreamHealthAsync(streamId)` polls `liveStreams?part=status` for `healthStatus` + `configurationIssues[]` → `StreamHealth`; banner decision in pure `StreamHealthReporter`
 - Webcam capture is shipped (milestone 1); the live desktop/game backdrop is shipped (ship task #1); **the output compositor (TASK 4 ship step 1) is SHIPPED**, **the FFmpeg locator (TASK 4 ship step 2) is SHIPPED**, **the encoder + RTMP push (TASK 4 ship step 3) is SHIPPED**, **WASAPI audio capture (TASK 4 ship step 4) is SHIPPED** — full plan in `TASKS.md`; the frame-pipeline wiring follows (its own PR)
 - `StreamConfig` defaults (`TargetBitrate=6000`, `Resolution="1920x1080"`) are stale — the live dropdown drives `StreamHealth.CurrentBitrate`/`FPS` instead
+- **v1 task queue (2026-08-19):** 5 new tasks added for v1 feature completeness:
+  - TASK 19: Scene transitions (Cut/Fade/Move/Custom) — required for professional polish
+  - TASK 20: Hotkeys (global keyboard shortcuts) — the single biggest UX gap
+  - TASK 21: Media source (video file playback) — starting soon videos, BRB loops
+  - TASK 22: Audio sync offset — lip-sync correction for USB mics/capture cards
+  - TASK 23: Studio mode (lightweight preview) — preview next scene before live
+  - These were identified through competitive analysis and are table-stakes for any streaming software in 2025-2026. Full details in `TASKS.md`.
 
 ### Screen backdrop capture (TASK 3 ship task #1)
 
@@ -589,38 +612,41 @@ Apply this to every UI decision:
 
 ## Monetization (design decision — the branding flash is the sword)
 
-Free forever: all streams unlimited, no time caps, no per-feature paywalls. The **one paid line is an
-annual subscription** (settled 2026-08-14 — replaces the earlier "one-time unlock" shape):
+Full pricing, discount codes, and Polar product details in `MONETIZATION.md` (gitignored).
+Brand palette and assets in `MARCOM.md` (gitignored). This section covers the in-app model.
 
-- **Free:** a periodic full-frame branding flash — "made with ytLlive!" rendered big and centered at
-  ~25% opacity for about one second (soft 250ms fade in/out), repeated every 300s, on the live output
-  (and on v0.2 local recordings). Implemented as `BrandFlashLayer` in the preview compositor
+Free forever: **all features unlocked for everyone** — no feature lock between free and paid.
+The **only difference is watermarking**. This is deliberate: no creator will tolerate a watermark,
+and as a good-guy developer, we give them complete access to every feature so no one can call us
+crooked.
+
+- **Free:** a periodic full-frame branding flash — "made with LlamaCasty!" rendered big and centered
+  at ~25% opacity for about one second (soft 250ms fade in/out), repeated every 300s, on the live
+  output (and on local recordings). Implemented as `BrandFlashLayer` in the preview compositor
   (`MainWindow.xaml` CanvasGrid) + `BrandFlashTimer` in `MainViewModel` — cadence 300s, first flash
   ~5s after go-live, only while live or recording. An always-on watermark can be cropped or covered;
   an intermittent full-frame flash can't be cropped and is impractical to edit around on a live feed.
-  **The flash is also the free tier's billboard** — every free stream advertises ytLlive to its own
-  viewers; the free tier is distribution, not compromise.
-- **Paid (annual subscription):** branding flash removed (flips `BrandFlashEnabled` off) + **Alerts**
-  (Super Chat / membership / subscribe pop-ins). Alerts is the recurring-value engine — a live-API
-  feature we maintain forever, which is the strongest argument for a yearly bill.
+  **The flash is also the free tier's billboard** — every free stream advertises LlamaCasty to its
+  own viewers; the free tier is distribution, not compromise.
+- **Paid (annual subscription):** branding flash removed (flips `BrandFlashEnabled` off). That's it.
+  No feature gating. Alerts, social bar slots, voice filters, TRAX, recording — everything is free.
 - **Pricing:** early-access founders rate **$49.99/yr** → **$99/yr list at GA** (v1). **Grandfathering:
   early adopters keep $49.99/yr for as long as the subscription is maintained**; a lapse means renewal
   at list. That's the whole policy — no escalation matrix (a realistic product lifetime is a few years;
   keep the promise simple).
-- **Billing:** NOT locked to itch.io (creator's call 2026-08-14). Hunted fact — **itch.io has no native
-  subscription billing** (no annual/recurring product billing; only pay-what-you-want, pre-orders,
-  early-access, keys, and a Patreon integration). **Chosen platform: Polar (polar.sh)** — open-source
-  MoR (Apache 2.0), handles payments, subscriptions, license keys, and global tax compliance.
-  Startup Program gives Scale plan free for 12 months. Details in `MONETIZATION.md`.
+- **Billing:** **Polar (polar.sh)** — open-source MoR (Apache 2.0), handles payments, subscriptions,
+  license keys, and global tax compliance. Startup Program gives Scale plan free for 12 months.
+  Product: `d105dfa1-497e-423b-8cd4-e0ee2e3abbc0`. Checkout: `llamacasty.com` → Polar hosted page.
+  Discounts: `LLAMAFOUNDER` (100% off, 50 uses), `LLAMA50` (50% off, 12 months). Details in `MONETIZATION.md`.
 - **Support (creator's model):** in-app bug-reporting mechanism → issues into git; most queries are
   how-tos / feature requests / manual-skimmers. Maintenance cadence = "when I get around to it" with
   emergency patches; not a 24/7 service promise.
 
-Deliberately rejected: always-on watermark (obscurable — replaced by the flash), hard stream-time
+**What was rejected:** always-on watermark (obscurable — replaced by the flash), hard stream-time
 cutoffs (the worst dead end — a stream dying mid-broadcast reads as broken, and YouTube streams
-routinely run 2-4 hours), soft-limit nagging, freemium tiers, and donation-only (relies on the
-kindness of strangers). Resolution/quality ceilings are **deferred** — that decision belongs to the
-resolution & streaming-constraints conversation, not monetization.
+routinely run 2-4 hours), soft-limit nagging, freemium feature tiers, and donation-only (relies on
+the kindness of strangers). Resolution/quality ceilings are **deferred** — that decision belongs to
+the resolution & streaming-constraints conversation, not monetization.
 
 ## Auth gates Go Live, but not exploration