Closes#550 (all four):
- Cancellation: track live subprocesses; POST /ansible/runs/<id>/cancel
(operator) SIGTERMs then SIGKILLs after a grace; new 'cancelled' status
(+ migration 0019, ALTER TYPE in autocommit). Queued runs cancel cleanly
before launch. Cancel button on run detail.
- Concurrency: global semaphore (ansible.max_concurrent_runs, default 3,
Settings→Ansible) caps simultaneous runs; excess show 'queued' (new status)
until a slot frees. Semaphore bound lazily per running loop.
- Structured results: parse PLAY RECAP into per-host ok/changed/unreachable/
failed/skipped + capture failed-task lines, stored in new results JSON
column (migration 0020); rendered as a host-summary table on run detail.
Keeps live streaming (no json-callback swap).
- Retention: full output written to a persistent log artifact
(/data/ansible/runs/<id>.log, env-overridable) beyond the 1 MB DB cap and
across restarts; in-memory replay buffer bounded + GC'd after completion;
Download-log route. Boot reconciliation now also sweeps stale 'queued'.
Unit tests for recap parsing + cancel flagging. Status colors updated across
run list / detail / schedules.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
