feat: store watcher fallback for dispatcher#34
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When the poll lock is held by another process (e.g. MCP server), the dispatcher now watches SQLite for new messages instead of polling iLink directly. This allows on_message handlers and run_background() to work alongside the MCP server. - Add max_rowid() and query_since_rowid() to MessageStore - Add _store_watch_loop() as fallback dispatcher target - Extract _dispatch_messages() to share logic between poll and watch loops - _start_dispatcher() auto-detects poll lock state and chooses strategy
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Summary
Closes #33.
on_messagehandlers andrun_background()work alongside the MCP server without any code changesmax_rowid()/query_since_rowid()toMessageStore,_store_watch_loop()and_dispatch_messages()toWeiLinkTest plan
tests/test_store_watcher.py— all pass