docs(phase-16): record 16.2 absorption + 16.3 anonId landing

PLAN/COMPLETED mark 16.2 absorbed into 16.1 and 16.3 landed (no migration). Folder CLAUDE.md files reflect anonId now accepted/persisted + the distinct-listener queries.

PLAN.md

@@ -250,8 +250,8 @@ The phase deferred behind the home-hero **Plays** stat card (`NowPlayingStats.ra
 **Sequenced BOTTOM-UP (Daniel directive 2026-06-19): foundation first, the live card LAST.** Reverses the earlier "visible win early" framing — Daniel does not care about the live card until the whole substrate and all metrics are finished. Strict chain: `16.1 → 16.2 → 16.3 → (16.4 optional) → 16.5`. 16.1 is the only cold-start wave; 16.5 (the card) is the capstone built last.
 
 - **16.1 — Foundation: capture seam + transport + event log (nothing reads it yet).** Player-service play tracker (high-water mark + engagement floor), share tracker in `SharePopover` (debounced), `sendBeacon` interop + unload handler, `POST api/event/{play,share}` (proxied, rate-limited), append-only `play_event`/`share_event` log + incremental `play_counter` rollup, server-side release resolution + derived release totals. **No `anonId` yet; no card consumption.** Cold-start wave. **Landed:** 2026-06-19 on dev. Migration `20260619155610_AddPlayShareTelemetry` authored but not applied (Daniel-gated).
-- **16.2 — Completion-bucket classification + shares.** Three-bucket classification (D1) correct and exhaustive end to end (tracker → payload → log → per-bucket counter columns); share-channel split (link/embed). **Depends on 16.1.**
-- **16.3 — Unique-listener `anonId` layer (lowest-priority metric, D5).** Option A: mint/read client first-party `localStorage` id, thread `anonId` onto payloads (nullable in the log), count distinct server-side (all-time, D3). **The last metric layer** — folded into "everything finished," explicitly last-built of the substrate. **Depends on 16.1; builds on 16.2.**
+- **16.2 — Completion-bucket classification + shares.** Three-bucket classification (D1) correct and exhaustive end to end (tracker → payload → log → per-bucket counter columns); share-channel split (link/embed). **Depends on 16.1.** **Landed:** absorbed into 16.1 — all §4.1 deliverables shipped inside the wave 16.1 foundation: `PlayBucket` enum (`Partial`/`Sampled`/`Complete`, exhaustive/non-overlapping) wired tracker → payload → log → per-bucket counter columns (`PlayCounter.PartialCount`/`SampledCount`/`CompleteCount`, `TotalPlays` computed sum); `ShareChannel` enum (`Link`/`Embed`) on `ShareEvent.Channel`; API-boundary bucket validation. The only §4.2 item not built is the optional `share_count` rollup on `play_counter` — correctly deferred (shares are not on the home-card hot path; per-target reads are speculative wave 16.4).
+- **16.3 — Unique-listener `anonId` layer (lowest-priority metric, D5).** Option A: mint/read client first-party `localStorage` id, thread `anonId` onto payloads (nullable in the log), count distinct server-side (all-time, D3). **The last metric layer** — folded into "everything finished," explicitly last-built of the substrate. **Depends on 16.1; builds on 16.2.** **Landed:** 2026-06-19 on dev (merge 297805b). No migration — `anon_id varchar(64)` columns and `IX_play_event_anon_id`/`IX_share_event_anon_id` indexes already shipped in the 16.1 migration.
 - **16.4 — Per-target / CMS stats surfaces.** `[speculative]` — `GET api/stats/{track,release}/{key}` + CMS analytics views (bucket/channel splits, leaderboards). Not committed; the event log already supports it. Off the critical path to the card; build before the capstone only if a surface wants it. **Depends on 16.1–16.3.**
 - **16.5 — Home Plays-card payoff (CAPSTONE, built LAST).** Extend `HomeStatsDto` + `GetHomeStatsAsync` with `TotalPlays` (+ secondary line = unique listeners, D7); flip `NowPlayingStats`'s third card from placeholder to live through the existing `GET api/stats/home` round-trip. **The final wave — built only once 16.1–16.3 are in place.**