Detect scoped runtime selector dependencies

[chubes4]

Summary

• Detect simple element-scoped querySelector/querySelectorAll runtime DOM dependencies.
• Detect simple closest() runtime DOM dependencies.
• Extend runtime target parity coverage through the artifact compiler contract and parity fixture.

Verification

• composer test

AI assistance

• AI assistance: Yes
• Tool(s): openai/gpt-5.5 via OpenCode
• Used for: Mining fixture selector patterns, implementing runtime dependency detection, updating tests, and running verification.