docs(commercial): one source of truth for the money — prices, entitlement, channels

The commercial plan was spread over five documents written in five different weeks,
and they contradicted each other: product.md sold the Store, decisions.md called the
Store dead then re-opened, Distribution.md (736 lines) still described Polar as a
download host, MARCOM.md quoted "no subscription" next to a paid tier, and README.md
promised "free forever". An outsider could not tell what ships.

docs/ai/commercial.md is now the only place money is decided: free = whole app at a
921,600 px / 30 fps output profile covering the recording as well as the stream; Pro =
$10/mo or $400 lifetime through Polar, key bound to the buyer's YouTube channel ID via
a claim page, 2 activations, 7–14 day lease with offline grace, fail closed, never
downgrade a running stream; one portable zip + winget primary, Steam and the Store
parked; Azure Trusted Signing (~$9.99/mo), no EV; Founding 200 promo; ~$135/yr costs;
anti-piracy posture and what is permanently rejected.

Everything else now points at it instead of restating it:
- product.md — money sections replaced with pointers; packaging rewritten to
  winget-first, Store parked; signing updated to Trusted Signing.
- decisions.md — graveyard with cause of death for free-forever, the Store ordering,
  the updater, and the 2026-10-30 reversal of the quality-ceiling rejection.
- Distribution.md — rewritten to release mechanics only (artifact, GitHub Releases,
  winget manifest, signing, checklist, takedown): 736 → 120 lines.
- TASKS.md — TASK 54 rewritten, TASK 48's route settled, TASK 10 superseded, five new
  rows (entitlement seam, output-profile gate, licence UI, system messages, packaging).
- README.md — "free forever" replaced with the real split.
- capture.md — obs-backgroundremoval is GPL-3.0 and so licence-INCOMPATIBLE since the
  proprietary EULA; the old "compatible" line was falsified by that change.
- TASKS/task-10, task-48, task-51, task-54 — superseded-banner at the top of each, so
  none of them reads as current policy.
- HANDOFF.md — rewritten: plan settled, next code unit is the entitlement seam.

MARCOM.md and MONETIZATION.md (gitignored) were corrected in place: policy pointer at
the top of each, the flash removed from every live claim, the Polar fee break-even
corrected to ~$900/mo, and the projections flagged as written against a dead model.

docs/ai/capture.md

@@ -312,8 +312,9 @@ This replaces the old five-seeder cluster (`Seed{Starting,Brb,Ending,Chat}Backgr
   `verify_against_mediapipe.py` feeds the same frame to MediaPipe's `ImageSegmenter` (original
   .tflite) and onnxruntime (our .onnx): max |diff| 5e-5, 100% binary agreement on two images.
   ⛔ Do NOT swap in PINTO model-zoo #109 (it's ML Kit's model, extracted — not Apache provenance).
-  obs-backgroundremoval is GPL-3.0 — license-compatible since LlamaCasty went GPL-3.0 (2026-10-09),
-  but none of its code is used; if any is ever borrowed, it needs its copyright notice kept.
+  obs-backgroundremoval is GPL-3.0 and therefore **licence-incompatible since the app went
+  proprietary (2026-10-30)** — none of its code is used, and none may be borrowed into this
+  codebase without a licence ruling first. Google's model is the provenance that matters.
 - **Contract:** input `[1,144,256,3]` RGB /255 NHWC → output `[1,144,256,1]` person probability. The
   whole frame is stretched (not cropped) to 256×144, so the mask maps back by normalized coordinates.
 - **Shipping:** `Assets/Models/selfie_segmenter_landscape.onnx` is an **EmbeddedResource** (in git,