thread/delete API (#25018)
## Why Clients can archive and unarchive threads today, but there is no app-server API for permanently removing a thread. Deletion also needs to cover the full session tree: deleting a main thread should remove spawned subagent threads and the related local metadata instead of leaving orphaned rollout files, goals, or subagent state behind. ## What - Adds the v2 `thread/delete` request and `thread/deleted` notification, with the response shape kept consistent with `thread/archive`. - Implements local hard delete for active and archived rollout files. - Deletes the requested thread's state DB row as the commit point, then best-effort cleans associated state including spawned descendants, goals, spawn edges, logs, dynamic tools, and agent job assignments. - Updates app-server API docs and generated protocol schema/TypeScript fixtures.
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