feat(backdrop): Capture Window… in-app window pin (TASK 38, Good Dog ONE test)

Click-to-pin an open window as the full-bleed Live backdrop, via the existing
window:<hwnd> capture path (same render layer as game/desktop). Session-scoped:
window:/picker: keys heal to auto on reload (HWND-recycle hazard); pin wins
while the window enumerates, then auto-fallbacks (game → desktop → static); a
dead window's capture session heals to auto, no dead ends.

Fix: ScreenCaptureSourceFactory.Resolve hex-parsed "window:0x<Hwnd>" WITHOUT
stripping the 0x prefix — NumberStyles.HexNumber rejects it, so every pin
resolved null ("No capture target for this key") and the heal silently rolled
back. Same flaw in IsAliveWindowPin (pin-wins guard was dead). Both fixed.

Commit also carries an out-of-scope prerequisite: PillRadioTests.cs:105 had a
committed stray token ("...PrimaryStartButtonLabel soil;", CS1003) blocking the
whole test-project compile — token removed.

Plus the previous session's uncommitted pricing docs (one-time $29/$49) that
share TASKS.md/ai.md/HANDOFF.md.

TASKS/task-10-monetization.md

@@ -1,10 +1,12 @@
-# TASK 10 — Monetization: watermark-only subscription + Polar billing
+# TASK 10 — Monetization: watermark-only one-time license + Polar billing
 
 > Catalog: [`TASKS.md`](../TASKS.md) — status and requirements live here.
 
 
-**Goal:** annual subscription via Polar.sh that removes the branding watermark. All features are
-free — the only difference between free and paid is the watermark.
+**Goal:** a **one-time perpetual license** via Polar.sh that removes the branding watermark. All features
+are free — the only difference between free and paid is the watermark. (Model changed 2026-09-21 from
+annual subscription to one-time "own it": $29 founder / $49 list lifetime. See `MONETIZATION.md` →
+Pricing for the reasoning.)
 
 **Related work — monetization awareness (2026-09-01, ungated, free):** this task's billing is the
 *payer* side; the *product* also carries built-in, ungated monetization awareness for every creator —
@@ -19,9 +21,10 @@ session report → journey tracker → Alerts (TASK 3 item 20).
 
 **Business details (pricing, Polar product/checkout/discounts) in `MONETIZATION.md` (gitignored).**
 
-**Polar product:** `d105dfa1-497e-423b-8cd4-e0ee2e3abbc0` (LlamaCasty, $99/yr, currently `private`)
+**Polar product:** `d105dfa1-497e-423b-8cd4-e0ee2e3abbc0` (LlamaCasty, ⚠️ currently configured as
+$99/yr **subscription** — must be re-created as a **one-time** product: $29 founder / $49 list lifetime)
 **Checkout:** `llamacasty.com` → Polar hosted page (~80% configured)
-**Discounts:** `LLAMAFOUNDER` (100% off, 50 uses, `once`), `LLAMA50` (50% off, 12 months, unlimited)
+**Discounts:** `LLAMAFOUNDER` (100% off, 50 uses, `once`), `LLAMA50` (50% off, `once`)
 **Org ID:** `c05fb364-b967-4f6c-adf2-8a144e46d085` (org-scoped OAT — `organization_id` can be omitted from API calls)
 **Key prefix:** `LCYT-`
 **Validate endpoint:** `POST https://api.polar.sh/v1/customer-portal/license-keys/validate` (no auth required for client-side validation)
@@ -34,6 +37,8 @@ session report → journey tracker → Alerts (TASK 3 item 20).
 4. ✅ **BrandFlash → watermark toggle** — `IsPremium` property setter flips `BrandFlashEnabled = !value`. Flash stops immediately on premium activation. Flash asset VideoFrame rendering deferred to TASK 4 compositor.
 5. ✅ **Remove social slot locks** — all 6 social bar slots open to everyone (no `IsPremium` gating on slots 3-6) — shipped as TASK 10c
 6. ✅ **"Unlock Premium" button** — `PremiumUrl` set to Polar checkout; `IsPremiumAvailable` is true; button lights up in the About hub.
-7. ✅ **Renewal/lapse handling** — startup re-validates against Polar API. Lapse → `IsPremium = false` → flash returns. Grace period: 14 days offline.
+7. ✅ **Licensing model** — startup re-validates against Polar API. **Perpetual key (2026-09-21): the
+   license never expires, `IsPremium` never lapses, and the flash does not return.** The former
+   renewal/lapse path is dead. Offline grace period (14 days) still applies to the validation call only.
 8. 🔶 **Velopack auto-updates** — NuGet packages + bootstrap in `App.xaml.cs`. Update URL self-hosted on DO droplet (pending configuration).