[hsmith-dev]

What and why

Gap 0.7 (stacked on #6): the Matrix features that used to answer "not available on Matrix yet".

• Pins use m.room.pinned_events, so other clients see them.
• Mute uses a room push rule; saved items live in account data dev.chatcraft.saved. Both follow you across devices and restarts.
• Room directory: channel.directory searches the homeserver's public rooms; Browse channels lists them with Join buttons. channel.join accepts a room id or #alias:server.
• Public channels get an address. Many homeservers (Synapse by default) only let admins list rooms in the directory; the creator is told, and the address still works.

Bugs found while testing (fixed)

• A message's sender (which carries no name) reset that person's display name to their username.
• Quick restarts got stale account data (e.g. a mute) from Synapse's sync response cache, because every launch sent the same from-scratch sync. The first sync now continues from the stored token; the snapshot reads the store and fetches history itself.
• Room version 12 ids have no :server part; joining by id assumed one.

Testing

• cargo xtask ci passes; all Matrix integration tests pass.
• New integration test against Synapse covers both directory policies (listed → join from the directory; not listed → creator is told, join by address), a pin seen by the other person, and saved items and mutes surviving a restart.
• Mapper regression test for the name reset.

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