Filter flush_pending() to only git-commit for terminal stages
(1_upcoming and 6_archived) while still broadcasting WatcherEvents
for all stages so the frontend stays in sync.
Reduces pipeline commits from 5+ to 2 per story run. No system
dependencies on intermediate commits were found.
Preserves merge_failure front matter cleanup from master.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
3a1d7012b4