docs: refresh submission-readiness docs; fix app-icon alpha blocker

[Adron]

Summary

Brings the three tracking docs back in line with the shipped code — all of them
overstated what was left to build — and fixes one real App Store submission
blocker found while auditing the assets.

What's included

• fix(assets) (4f9e30d) — AppIcon-1024.png shipped as RGBA. Every pixel was
  fully opaque, but upload validation rejects the presence of an alpha channel
  (ITMS-90717), so the first archive upload would have failed. Re-saved as RGB
  with the RGB pixel data unchanged; the dark-appearance variant keeps its alpha,
  which Apple expects.
• the-gaps-access.md (bbfe693) — G1–G7 were fixed 2026-08-15 and merged
  2026-08-16 (PRs fix(access): subscriber-gate list-watcher management (G1) #17–fix(access): route WatchersListView 401s through handleUnauthorized (G7) #23), but the doc still read as an open backlog. Added a
  closure callout, a per-gap status column, and file/line evidence verified against
  the current tree. The free-user gating path stays flagged as an open coverage
  hole — the only test account is a subscriber.
• App-Store-Deployment.md — §0 still listed GitHub, tag discovery, offline
  sync, post-as-org, and doc inline images as unbuilt. Rewrote the shipped-phases
  table and feature summary, ticked Tier 0/Tier 1 (Phase 9 split into shipped code
  vs. its two open portal steps), converted the deferred-blockers table to
  statuses, added Associated Domains to the App ID / capability steps, and extended
  the smoke-test list.
• the-gaps.md — the "remaining" row was stale:
  feat/github-oauth-universal-links is merged, supportsNativeAuth is true, and
  the entitlement is in the repo. Split into phases 17–19 plus the two genuinely
  open items (G11 presence, bare /lists/:id inbound), and updated asks A1/A2.
• App-Store-Deployment-Checklist.md — rewritten around what's actually left,
  recording this session's verifications: privacy/support/terms URLs 200, AASA live
  with the correct appID and cached by Apple's CDN, Release signing config,
  exactly two entitlements, and no usage-description strings required (media comes
  only from out-of-process PhotosPicker).
• Screenshot sizing correction — iPhone 15 Plus renders 1290×2796, not the
  1242×2688 the docs claimed for the 6.5" slot. A verified 6.5" simulator
  (iPhone 11 Pro Max on iOS 17.5) is named in both docs; both required capture
  sizes were confirmed against a running build.
• New App-Store-Listing-Copy.md — subtitle, promotional text, description,
  keywords, What's New, review notes, age-rating answers, and a privacy nutrition
  label audited against APIClient request bodies (adds Photos/Videos and
  Search History, which the old table missed). Every field length-checked and
  free of billing language per Guideline 3.1.1.
• README — GitHub sign-in is no longer hidden; the backend mobile OAuth branch
  shipped 2026-08-14.

Testing

• xcodebuild -scheme InterlinedList -destination 'platform=iOS Simulator,id=302E002E-…' -parallel-testing-enabled NO -skip-testing:InterlinedListTests/E2EReadOnlyTests test — 823 tests, 0 failures, ** TEST SUCCEEDED **
• Rebuilt after the icon change — ** BUILD SUCCEEDED **, asset catalog clean
• App installed and launched on iPhone 16 Pro Max and the 6.5" simulator; capture
  confirmed at exactly 1320×2868 and 1242×2688
• Live checks: /privacy, /help, /terms → 200; /.well-known/apple-app-site-association
  → 200 application/json with appID: BJA9558E4B.com.interlinedlist.app; Apple CDN copy → 200

Follow-ups (not in this PR)

• Store screenshots still need capturing — the pipeline is verified, but driving the
  app past login needs simulator tap/type tooling that wasn't available in this
  session (use qa-screenshotter or capture by hand).
• Everything else outstanding is off-machine: Apple portal (App ID + Push +
  Associated Domains → regen profile), APNs .p8, demo reviewer account, ASC record,
  build bump, archive → TestFlight → submit.

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