feat: type local module interfaces

[Lord1Egypt]

Summary

• parse local imports into typed function interfaces without executing modules
• cache interfaces by canonical path and SHA-256 content hash
• resolve transitive imports and preserve E0030 cycle detection
• use path-aware checking from run, check, test, and evaluator module loading

Verification

• cargo test --release
• cargo clippy --all-targets -- -D warnings
• cargo fmt --check
• tools/phase0_audit.py check

[gemini-code-assist]

Caution

The consumer version of Gemini Code Assist on GitHub has been sunset. All code review activity has officially ceased.