jif 293de27177
Add SQLite storage for local agent message boards ( #46966 ) ...
## What changed
Add `LocalAgentMessageBoard` with persistent channels, posts, and subscriptions scoped by `SessionId`. Support channel creation, posting and replies, subscription changes, and bounded reads using Unicode character offsets.
Serialize mutations across independent handles with immediate transactions. Deduplicate retries by caller and request ID, reject changed requests that reuse an ID, and return existing post metadata without repeating notifications. Deliver deduplicated notifications after commit; notification failures leave committed posts successful and readable.
## Testing
Add integration tests covering concurrent retries across independent handles, reopening persisted boards, subscription routing, board isolation, Unicode reads, invalid recipients, inactive recipients, and notification failures.
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jif
293de27177