[aviggiano]

Summary

• adds pure declaration-only sibling and ancestor artifact-output resolvers
• binds ancestors by exact sealed attempt and artifact directory instead of logical IDs or conventional filenames
• retains multiple loop attempts and same-contract sibling outputs while rejecting stale, duplicate, forged, or rebound declarations

Validation

• Runtime dependency build
• Runtime build and schema-registry verification
• Runtime test TypeScript compilation
• Focused resolver tests: 6/6
• Focused ESLint, Prettier, and git diff checks

Stacked on draft #457 and tracks #439. This PR is intentionally draft and must not be merged independently.