Fix OpenCode 2 tools in multiple directories and duplicate captures

[ishaanxgupta]

Summary

• Every directory saved every session. OpenCode delivers every location's events to every plugin instance, and some events have no location. With per-directory owners, each loaded directory captured every session. Each runtime now handles only sessions in its own directory: it checks the event's location, or looks up the session's directory once and caches the answer.
• Replay on shutdown. cleanup() cleared session state before its final flush, so the flush re-sent every batch it had already saved. It now flushes first.
• Replay after a reload or restart. A new runtime started with an empty record of saved batches and re-sent earlier turns of any resumed session. Saved batch ids are now kept in plugin storage, loaded before capturing, and removed when the session is deleted.
• Unbounded retries after a timeout. A write that timed out on the client may still have reached the server, but it was re-sent after every later turn. A batch is now tried at most 3 times, in both the V1 and V2 plugins.