Bridge static form visual parity

[chubes4]

Summary

• Refresh Block Format Bridge to consume the static form surrogate improvements from Refresh h2bc static form parity block-format-bridge#129.
• Bridge source CSS selectors for converted static form labels and controls so native surrogate markup inherits artifact form styling.
• Keep fallback output clean while improving Ember & Rye visual parity for issue Finish Ember & Rye website artifact visual parity #305.

Dependencies

• Depends on Fix static form surrogate parity html-to-blocks-converter#421.
• Depends on Refresh h2bc static form parity block-format-bridge#129.

Evidence

• Clean frozen import: pass=true, fallback_count=0, core_html_block_count=0, invalid_block_count=0.
• Latest visual parity mismatch ratio: 0.3749690120306234, down from the prior WIP baseline 0.3843813804446461.
• Local verification required temporarily deactivating data-machine, because its older bundled prefixed BFB/h2bc copy can shadow the root SSI dependency until refreshed.

Testing

• php tests/smoke-website-artifact-document-metadata.php
• Frozen Ember & Rye artifact import quality report
• Local visual parity harness against generated theme ember-rye-parity-fix

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode (GPT-5.5)
• Used for: Drafted the dependency update, CSS bridge, smoke assertion updates, and local verification commands; Chris remains responsible for review and validation.