513a5c90b1
Council sessions are long-running: athena-junior launches members then waits for them via background_wait. Two changes prevent premature kills: - Force run_in_background=true when subagent_type resolves to athena-junior, avoiding the 10-minute sync poll timeout (MAX_POLL_TIME_MS) - Exempt athena-junior from the 30-minute TASK_TTL_MS hard cutoff since council members have their own independent TTLs - Fix missing bulk_launch field in AthenaOverrideConfigSchema (type error)