Nothing ever removed an indexed row: redacted messages stayed searchable
with full plaintext and rendered as normal results. Now: a client-level
RoomEvent.Redaction listener deletes the row, leave/ban clears the room
(clearRoom finally has a caller), m.replace edits upsert the original
row instead of indexing the "* fallback" separately, and cached rows
whose local event is redacted render through the existing
redacted_because placeholder. Unit-tested.
Fixes#14
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA
