docs(rust): phase 15 as built — the map and events on a phone (PLAN.md §31.5–§31.7)

- PLAN.md §31.5: what was built in website and Android-app, where the
  build departed from §31.2, and the seven-step emulator walk.
- §31.6: what the walk found: the zoom lost twice (fixed), the tally a
  stand-in cannot feed, the off-grid row the frame clamps, the "wiped
  Dec 31, 1" header, the card that outlives its marker.
- §31.7: what is not proven (a real player, a counted tally, a UO site).
- Phase row 15 and the Android plan's M17 marked built and walked.
- EVENTS.md § API surface: the public calendar's run entries carry
  runId (D125). BACKEND_DESIGN defers event routes to that table.
- PLAYER_WALK.md: the map and events on a phone, for the person-parts.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E14m6SuuY6i1vASFeGDBeY

website/EVENTS.md

@@ -1847,7 +1847,7 @@ no URL moved.
 | `DELETE /admin/events/series/:seriesId` | admin, editor | delete it, detaching its definitions; answers with how many |
 | `GET /admin/events/calendar` | staff | the calendar for a window: materialised runs and projected occurrences (Phase 4) |
 | `GET/PUT /admin/events/actions` | admin | which actions are enabled on this deployment, and their per-run caps (Phase 6). `admin` on the read as well as the write; the PUT takes one action at a time |
-| `GET /public/events` | — | **the calendar** (Phase 14a): upcoming, live and recent, by series. Runs and projections interleaved and each saying which it is, ascending by instant. Instants are UTC and every entry carries the EVENT's own zone; the reader's zone places them. Rehearsals and unlisted events are absent. A run is an INTERVAL, not an instant: an entry is in the window when the run OVERLAPS it, so one that began before the window and has not ended is still "what is on" (Phase 16a — reading the start instant alone made this route serve only the first of its three words, while the event's own page said `live`). Defaults to seven days back through 31 days out — the tail is where "recent" lives — and the window may span at most 92; the anonymous surface is the one with no login in front of it. Projections are forecast from NOW, never into the tail, since a slot the runner has already passed did not happen |
+| `GET /public/events` | — | **the calendar** (Phase 14a): upcoming, live and recent, by series. Runs and projections interleaved and each saying which it is, ascending by instant. Instants are UTC and every entry carries the EVENT's own zone; the reader's zone places them. Rehearsals and unlisted events are absent. A run is an INTERVAL, not an instant: an entry is in the window when the run OVERLAPS it, so one that began before the window and has not ended is still "what is on" (Phase 16a — reading the start instant alone made this route serve only the first of its three words, while the event's own page said `live`). Defaults to seven days back through 31 days out — the tail is where "recent" lives — and the window may span at most 92; the anonymous surface is the one with no login in front of it. Projections are forecast from NOW, never into the tail, since a slot the runner has already passed did not happen. A `run` entry carries its `runId` (Rust D125), the same id the event page publishes on each occurrence and `?run=` takes, so a client holding a run id from elsewhere (a module's map marker) can find its event; a projection has none, because nothing is committed to it |
 | `GET /public/events/:slug` | — | **one event** (Phase 14a): storyline, arc, what is live, what is next, what happened recently, and a results table once one is published. Takes an optional `?run=`, which is what an announcement's link carries, so a mail about last Friday's occurrence does not open next Friday's; a run belonging to some other event is **ignored rather than refused**, because a stale link in a months-old mail should land on the event it was about. A draft, an archived definition and an unlisted one all answer 404 |
 | `GET /public/events/series/:slug` | — | **the arc** (Phase 14a). A series with no listed events is a 404, not an empty page: the arc is a label on its definitions, so a page for an empty one would publish the fact that an operator has named something they have not announced |
 | `GET /player/events/history` | auth | **this account's participation** (Phase 14a) — the run, when it was, the score a module reported, and the rank once results were published (null until then, which is a real state rather than an error). Self-scoped on the session with **no id parameter**, deliberately: a route that took one would be a middleware mistake away from publishing who attended what. Keyset-paged on the participation row's id. It obeys the calendar's two exclusions, so attending an unannounced event does not disclose that it exists |