Implement spec-mandated pre-flight guardrail checks that validate plan
readiness before entering the Strategize phase:
1. Action schema validation — verifies action exists and is well-formed.
2. Actor availability — confirms all 4 actor roles registered.
3. Skill/tool existence — transitively resolves all tools/skills.
4. Automation policy — verifies profile permits execution.
5. Rollback feasibility — ensures all tools checkpointable if required.
6. Resource accessibility — shallow connectivity check on linked resources.
7. Validation attachment resolution — pre-resolves all applicable validations.
PlanPreflightGuardrail service runs all 7 checks via run_all_checks().
On first failure, raises PreflightRejection with check name and message.
Wired into plan_lifecycle_service before Strategize phase.
Behave BDD: 18 scenarios covering all 7 checks (positive + negative).
Robot Framework: 3 integration smoke tests.
ASV benchmarks: pre-flight check execution time.
ISSUES CLOSED: #582
freemo