When an agent thread hangs (truly blocked, never checks _interrupt_requested),
/stop now force-cleans _running_agents to unlock the session immediately.
Two changes:
- Early /stop intercept in the running-agent guard: bypasses normal command
dispatch to force-interrupt and unlock the session. Follows the same pattern
as the existing /new intercept.
- Sentinel /stop: force-cleans the sentinel instead of returning 'nothing to
stop yet', so /stop during slow startup actually unlocks the session.
Follow-up improvements over original PR:
- Consolidated duplicate resolve_command imports into single early resolution
- Updated _handle_stop_command to also force-clean for consistency
- Removed 10-minute hard timeout on the executor (would kill legitimate
long-running agent tasks; the /stop force-clean handles recovery)
Cherry-picked from Mibayy's PR #2498.
Co-authored-by: Mibayy <Mibayy@users.noreply.github.com>
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