Summary

Reference validation rules are defined in SARIF but not implemented in imports.rs or any other validator.

Rules to Implement

• REF-001: Import file not found
• REF-002: Broken markdown link

Deliverables

• Add REF rules to crates/agnix-core/src/rules/imports.rs or new file
• Wire file existence checks
• Add test fixtures in tests/fixtures/refs/
• Tests for each rule

References

• knowledge-base/VALIDATION-RULES.md