feat(tracker): Phase 1 plugin — Matrix + SQLite, rules-only

Sibling to journal/, implements the Community Organizer spec
(docs/community-organizer-spec.md) over maubot:

  !add <text>            freeform inbox capture; rules classify
  !task <text> [#tag…]   explicit task
  !sidequest [#tag…]     optional / passion-project item
  !remind in <N>(s|m|h|d) <text>   chat-side timed reminder
  !done <id>             close task or sidequest
  !list [type]           query open items
  !setup add/remove      per-room shortcut config

One @command.passive dispatcher routes universal verbs to handlers
and unknown verbs through the per-room shortcut table. Avoids the
multi-line @command.new footgun (per ~/dev/CLAUDE.md) and lets
shortcuts coexist with universal verbs without decorator priority
games.

Rules classifier (classify.py) is intentionally conservative — only
buckets on clear shapes (buy keywords, past-tense markers, todo
intent, remind prefixes); ambiguous capture lands in `!list inbox`.
LLM fallback is Phase 2b on a dedicated inference node.

Reminders (scheduler.py) replay from DB on bot start so restarts
don't lose pending timers; missed-while-down stay open for query.

`nostr_event_id` column reserved for Phase 2a — Matrix-local only
for now.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

README.md

@@ -10,6 +10,7 @@ castle hosts; the actual plugin code lives here.
 | Plugin | Purpose |
 |---|---|
 | [`journal/`](./journal/) | Farm-journal bot. `!journal <text>` records what you did, scoped per-user/room/timestamp. `!journal show [@user]` and `!journal today` query back. |
+| [`tracker/`](./tracker/) | Community-organizer bot. `!add` / `!task` / `!sidequest` / `!remind` / `!done` / `!list` / `!setup`. Implements the [Community Organizer spec](./docs/community-organizer-spec.md) — per-room shortcuts, 5-level priority, rules-based inbox classifier. |
 
 ## Community Organizer protocol