* fix(memory): close sqlite connections in kickoff task outputs storage
`with sqlite3.connect(...) as conn` only commits or rolls back; it never
closes the connection, which then survives in a reference cycle until a
cyclic GC pass. Every Crew kept an open handle on
latest_kickoff_task_outputs.db, so on Windows the file stayed locked and
any later delete, rename or temp-dir cleanup failed with PermissionError
(WinError 32). Wrap each connection in contextlib.closing, keeping the
existing commit/rollback semantics, and add regression tests.
* test(memory): cover rollback and close on a failed write
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Co-authored-by: Vidit Ostwal <110953813+Vidit-Ostwal@users.noreply.github.com>
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