user 68558ce5b5 feat: per-channel hashcash proof-of-work for PRIVMSG anti-spam ...

Add per-channel hashcash requirement via MODE +H <bits>. When set,
PRIVMSG to the channel must include a valid hashcash stamp in the
meta.hashcash field bound to the channel name and message body hash.

Server validates stamp format, difficulty, date freshness, channel
binding, body hash binding, and proof-of-work. Spent stamps are
persisted to SQLite with 1-year TTL for replay prevention.

Stamp format: 1:bits:YYMMDD:channel:bodyhash:counter

Changes:
- Schema: add hashcash_bits column to channels, spent_hashcash table
- DB: queries for get/set channel hashcash bits, spent token CRUD
- Hashcash: ChannelValidator, BodyHash, StampHash, MintChannelStamp
- Handlers: validate hashcash on PRIVMSG, MODE +H/-H support
- Pass meta through fanOut chain to store in messages
- Prune spent hashcash tokens in cleanup loop (1-year TTL)
- Client: MintChannelHashcash helper for CLI
- Tests: 12 new channel_test.go + 10 new api_test.go integration tests
- README: document +H mode, stamp format, and usage

2026-03-17 04:53:33 -07:00

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