chore(launch): reconcile README/store live-status + add demo-funnel analytics (#111)

Two scoped changes for the no-spend growth launch (Growth Launch Kit,
Notion page 3a1ac25eb49f81099cc9f3a4286c8ec4):

1. README.md and distribution/play-listing.md said Google Play was
   "coming soon" / internal-testing-only, while distribution/retention-analysis.md
   and the live play.google.com listing show it's actually public with 1K+
   installs. Fixed the contradiction, added Google Play as a third install
   channel, and added an accurate mention of the new offline demo mode
   ("Try a Demo" — reasoning, grep, diff, permission prompt, ~30s, no server)
   matching what app/demo.tsx + src/lib/demo-script.ts actually render.
   play-listing.md's stale pre-launch checklists are marked historical
   instead of rewritten, so #83's ASO copy/keyword work is untouched.

2. Added the demo funnel's key metric (demo-completion, per the launch
   kit) as four consent-gated PostHog events: demo_started,
   demo_step_advanced, demo_completed, demo_exited_to_connect. Pure
   property-derivation logic lives in src/lib/demo-analytics.ts (no
   RN/PostHog imports, unit-tested with node --test, same pattern as
   analytics-classify.ts) and is wired into app/demo.tsx's lifecycle.
   Updated docs/analytics.md's event table and the privacy policy's event
   list (distribution/privacy-policy.md + its two HTML mirrors) per the
   repo's "new event requires a policy update" convention.

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

distribution/play-listing.md

@@ -1,8 +1,14 @@
 # Google Play Store Listing — OpenCode Mobile
 
-Copy-paste reference for completing the Play Console store listing for `cc.agentlabs.opencode`.
+Copy-paste reference for the Play Console store listing for `cc.agentlabs.opencode`.
 Paste these values directly into Play Console. Fields are validated against Play limits.
 
+> **Status: live.** The app is publicly available on the production track —
+> https://play.google.com/store/apps/details?id=cc.agentlabs.opencode (1K+ installs;
+> see `distribution/retention-analysis.md`). The "First release strategy" and "Pending
+> before first publish" sections below are kept as a historical record of how it got
+> there — do not read them as the current state.
+
 ---
 
 ## Main store listing
@@ -322,25 +328,28 @@ Bump this file before tagging a release. Keep it under 500 chars. Per-language v
 
 ---
 
-## First release strategy
+## First release strategy (historical — completed)
 
-1. **Internal testing** track first (up to 100 testers, no review) — what CI is wired for.
+1. **Internal testing** track first (up to 100 testers, no review) — what CI was wired for.
 2. **Closed testing** — 14+ days, 12+ testers required for new org accounts before promoting to production (Google's 2023 policy).
 3. **Open testing** — optional intermediate step.
 4. **Production** — only after Closed testing requirements met.
 
-CI currently publishes to `internal` track. ✅
+Result: the app cleared this path and is now live on the production track (see the
+status note at the top of this file). CI's default dispatch track (`internal`) is
+still used for routine test builds; production releases are dispatched explicitly
+(`track=production`) — see `.github/workflows/publish-play-store.yml`.
 
 ---
 
-## Pending before first publish
+## Pending before first publish (historical — resolved)
 
-- [ ] Identity verification (government ID upload, Google review)
-- [ ] App icon (real PNG, not placeholder)
-- [ ] Adaptive icon (real PNG)
-- [ ] Feature graphic 1024×500
-- [ ] At least 2 phone screenshots
-- [ ] Privacy policy live at https://dzianisv.github.io/opencode-mobile/privacy/
-- [ ] Decide pricing model
-- [ ] Run IARC content rating questionnaire (after app created in Play Console)
-- [ ] Complete Data safety form (after app created in Play Console)
+- [x] Identity verification (government ID upload, Google review)
+- [x] App icon (real PNG, not placeholder)
+- [x] Adaptive icon (real PNG)
+- [x] Feature graphic 1024×500
+- [x] At least 2 phone screenshots
+- [x] Privacy policy live at https://dzianisv.github.io/opencode-mobile/privacy/
+- [x] Decide pricing model (free, no ads, no IAP)
+- [x] Run IARC content rating questionnaire (after app created in Play Console)
+- [x] Complete Data safety form (after app created in Play Console)