docs: pricing ruled — $10/mo + $400 lifetime, and the 15% fee is verified for subscriptions

Reconcile the pending doc edits with the creator's actual ruling, and close the
revenue-share question that was blocking the monthly price.

Verified from the App Developer Agreement v8.10 PDF itself (downloaded and
text-extracted, not a search excerpt). Section 6(b) has only three tiers:
6(b)(i) 15% for Apps and their In-App Products *not listed in* 6(b)(iii);
6(b)(ii) 12% Games-only; 6(b)(iii) 30% for Xbox console apps/games, Xbox
non-subscription IAP, and Windows 8/Phone 8. LlamaCasty is a Windows PC App,
so 6(b)(i) governs BOTH tiers -- there is no subscription surcharge. The
agreement's own changelog (v8.0, Oct 26 2017) states it outright: "implement
the 85/15 revenue share for non-Game subscriptions."

  => $10/mo nets $8.50 (~$102/yr); $400 lifetime nets $340.

Also confirmed: the 15% applies after VAT/GST (Net Receipts definition),
payouts are monthly above a $50 threshold, and no better small-indie rate
exists in the standard terms.

Creator ruling recorded: $10/mo subscription or $400 lifetime, no annual, no
.99. This supersedes the 2026-09-21 one-time $29 -> $49 model.

Two obligations ADA 6(h) attaches to the recurring tier, recorded because they
change its risk profile and are the reason lifetime is the hedge: we must
fulfil the subscription for the entire period as marketed (on breach Microsoft
may refund the full amount plus taxes in its sole discretion), and raising the
price disables auto-renew -- so $10 is effectively locked for the product's life.

Stale facts fixed in the same change rather than appended:
- research-store-certification.md: IARC was 11.11.1/11.11.2 in one table and
  10.11.1 in another; corrected to 10.11.x.
- research-store-certification.md: policy 10.8.1/10.8.2 still asserted "Polar
  explicitly permitted" and "tick the third-party purchase box". Void now that
  Store IAP is the route and Polar is being torn down.
- task-48: the working YouTube demo account (10.3.1) was accidentally dropped
  from the certification list during the Store-IAP edit. Restored -- a reviewer
  cannot use the app without one.
- MyMistakes.md: the verified-fact-vs-decided-outcome lesson now closes its
  loop (the creator did rule the way the research pointed), and records the
  over-correction that followed.

Docs-only. No code, no build, no tests.

HANDOFF.md

@@ -1,8 +1,38 @@
 # HANDOFF — current state
 
 **Branch:** `main` (pre-1.0, no feature branches — creator ruling 2026-08-24).
-**Last pushed:** `e78c58f` (Store certification research). This unit (recording the Store MSIX
-+ Store IAP ruling) is **docs-only** — no code touched, no build, no tests run.
+**Last pushed:** `b2036a3`. This unit (reconciling the pricing ruling + verifying the Store
+revenue share) is **docs-only** — no code touched, no build, no tests run.
+
+## ✅ DECIDED 2026-09-27 — pricing: `$10/mo` subscription, or `$400` lifetime, **no annual**
+
+**Creator's ruling, verbatim: *"Let's just go with $10 monthly recurring subscription for option
+A and, for option B, a lifetime sub for $400. No annual."* ⛔ **No `.99` prices** (earlier
+ruling: *"Let's stop with the x.99 stuff - I find that irritating. Just say: ten bucks a
+month"*). This **supersedes** the 2026-09-21 one-time `$29 → $49` model and the old `$99/yr`
+sub. No feature gating: free gets everything, the branding flash is the only paid delta.
+
+**✅ Store revenue share VERIFIED — 15%, and subscriptions are NOT penalised.** Read from the
+ADA v8.10 PDF itself (downloaded, text-extracted — not a search excerpt). §6(b)(i) charges
+**15%** on "any Apps (and any In-App Products in such Apps) that are **not listed in Section
+6(b)(iii)**"; 12% is Games-only; 30% covers Xbox console apps/games, Xbox non-subscription
+IAP, and Windows 8/Phone 8. LlamaCasty is a Windows PC App — not a Game, not Xbox, not Win8 —
+so **6(b)(i) governs both tiers.** The agreement's own changelog (**v8.0, Oct 26 2017**) says
+it outright: *"implement the **85/15 revenue share for non-Game subscriptions**."*
+
+⇒ **`$10/mo` nets `$8.50/mo` (~$102/yr). `$400` lifetime nets `$340`.** Also confirmed: the
+15% applies *after* VAT/GST (Net Receipts), payouts are monthly above a **$50** threshold, and
+no better small-indie rate was found in the standard terms.
+
+**⛔ Two obligations §6(h) attaches to the recurring tier** (why lifetime is the hedge):
+(1) we must **fulfil the subscription for the entire period as marketed**, and on breach
+Microsoft may refund the customer *"the full amount, plus taxes... in Microsoft's sole
+discretion"*; (2) **raising the price disables auto-renew** — so `$10` is effectively locked
+for the product's life absent Microsoft's price-change process.
+
+**⏳ Still open:** the `$50` subscriber→lifetime upgrade-discount SKU was discussed and is
+**not approved** — do not declare it. Individual vs Company Partner Center account still
+unanswered (get it right before enrolling).
 
 ## ✅ DECIDED 2026-09-27 — distribution is the Microsoft Store: MSIX + Store IAP
 
@@ -25,11 +55,9 @@ thinks I'm expired" bug class. **Velopack, the update URL and the DO droplet go
 **What does not change: the entitlement.** Free gets everything; the branding flash stays the
 ONLY paid delta. Store IAP changes how `IsPremium` is *obtained*, never what it *gates*.
 
-**⏳ Still open: the price.** The Store revenue share is unverified (⚠️ assume no percentage —
-check current terms before setting a price), and `MONETIZATION.md`'s `$29 → $49` one-time
-decision is re-opened against a fresh instinct toward a ~$99/yr subscription. **No price is
-encoded anywhere until the creator settles it.** Note the storefront changed, so the old
-"~$69 floor" and "don't break the launch-price promise" notes now refer to Store tiers.
+**⛔ The old "still open: the price" note is retired — the price is settled, see the top of
+this file.** The old "~$69 floor" and "don't break the launch-price promise" notes refer to
+the old Polar storefront and are **not** current.
 
 ### The first code unit: bundle ffmpeg (TASK 48 item 1)