Add runtime parity repair diagnostics

[chubes4]

Summary

• Add source document path, target id/class, repair bucket, suggested primitive, actionability, and materialization hints to runtime dependency parity rows.
• Pass the artifact entry path into the runtime dependency parity report so missing DOM target findings identify the owning source file.
• Extend PHP transformer contract coverage for missing canvas runtime target diagnostics projected through the conversion report.

Tests

• composer test:canonical
• composer test

AI assistance

• AI assistance: Yes
• Tool(s): openai/gpt-5.5 via OpenCode
• Used for: Implementing and testing Blocks Engine transformer diagnostics for fixture matrix parity work.