poc

Generates and validates Foundry PoC tests from attack scenario documents. Use when: (1) Audit Phase 3 invokes Skill(vigilo:poc) for each High/Medium finding, (2) A finding at .vigilo/findings/ needs PoC validation, (3) Converting attack scenarios into executable Foundry tests. Outputs: test/poc/{finding-id}.t.sol, .vigilo/poc/ validation logs.