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Implement step-level progress persistence and plan resume with graceful shutdown handling. - Add ResumeCheckpoint, ResumeMetadata, ResumeEligibility, ResumeSummary domain models (resume.py) - Add PlanResumeService with validate_eligibility(), build_resume_summary(), resume_plan(dry_run), record_step_checkpoint(), record_shutdown() - Add last_completed_step and last_checkpoint_id fields to Plan model - Add 'plan resume' CLI command with --dry-run flag - Update plan lifecycle docs (ADR-006) with resume behavior section - Add Behave tests (24 scenarios in plan_resume.feature) - Add Robot Framework integration tests (10 tests) - Add ASV benchmarks for resume overhead Closes #328