README.md:
- Added provider error recovery section (item 5) covering transient
vs permanent error classification and auto-resume behavior
- Updated crash recovery to mention headless auto-restart with backoff
- Fixed numbered list (was 1-11 with duplicate 7, now 1-12 sequential)
docs/parallel-orchestration.md:
- Updated worker crash recovery section to reflect v2.27 persistent
state — workers now survive crashes via disk state recovery