Fix presentational data hooks forcing HTML fallbacks

[chubes4]

Summary

• Keep presentation-only animation data selectors such as [data-reveal] and [data-delay] out of runtime DOM target preservation.
• Adds a php-transformer parity fixture for static marketing sections that should remain editable native blocks.
• Reduces 14-restaurant HTML fallback pressure without changing inline SVG preservation semantics.

Evidence

• composer parity: passed, 203 fixtures.
• composer test: passed, including contracts, units, parity, and install proof.
• Direct SSI 14-restaurant matrix after fix: 96.28% native, 3.72% core/html, 0 invalid editor blocks. Baseline from issue evidence: 71% native, 29% core/html.
• Direct SSI c1 matrix after fix: 7/7 fixtures succeeded, 97.40% native, 2.60% core/html, 0 invalid editor blocks.
• 2-onepager-coffee after fix: 90.82% native, 9.18% core/html, 0 invalid editor blocks.

Fallback Taxonomy

• div, p, h2, span, and section fallbacks in 14-restaurant were static editorial content carrying reveal/delay data attributes; these now convert to core group/heading/paragraph output.
• Remaining 14-restaurant reported core/html findings are inline SVG artwork (hero-flame-svg, chef-flame-art, and a small icon SVG). Those remain raw HTML intentionally because arbitrary inline SVG has no safe core/native equivalent that preserves the vector artwork.
• Script fallback remains accepted runtime preservation.

Fixes #487.

AI assistance

• AI assistance: Yes
• Tool(s): openai/gpt-5.5 via OpenCode
• Used for: Investigated fallback evidence, implemented the transformer/test change, ran verification, and drafted this PR description.