Every re-attempted phase now starts with a clean slate:
- phase_runner::launch_phase DELETEs prior status IN ('failed',
'cancelled') topology_runs for the phase before enqueuing the
new ones. Completed runs are kept for audit; only the failure
noise from earlier attempts goes.
- POST /api/missions/{id}/phases/{phase_id}/retry — resets a
failed/cancelled phase to 'pending' (auth-scoped to the calling
workspace + guarded on mission.status='running'). phase_runner
picks it up on the next 10s tick.
- MissionCanvas phase card grows a coral 'Retry' button, visible
only when phase.status='failed' and mission.status='running'.
Click → resets + refreshes; the prior failed run rows disappear
from the card as soon as phase_runner enqueues the new attempt.
Design: auto-purge in phase_runner rather than a separate 'clear
failed runs' endpoint. Users don't have to manually clean up before
retrying; the runner does it as part of the natural work of firing
a fresh attempt.
Verified: cargo check + tsc + eslint --quiet all green.