Preserve runtime-targeted form controls

[chubes4]

Summary

• render core/search with concrete form/input markup so search blocks expose DOM targets in serialized HTML
• carry runtime-targeted search input IDs/classes onto the generated input element
• preserve runtime-targeted readable form controls as sanitized native HTML instead of collapsing them to prose

Root cause

Runtime DOM selector detection was already passing IDs/classes into runtime_dom_selectors, but the form/search conversion family still converted controls into semantic block summaries. core/search had no generated HTML in BlockFactory, and readable form controls such as selects/checkboxes could become paragraphs, so script-addressable control selectors disappeared from generated markup.

Verification

• php tests/contract/run.php
• php tests/parity/run.php --fixture=artifact-runtime-target-container-preservation
• composer test

Expected impact

Targets search and form-control runtime gaps, especially selectors such as #note-search, .search-input, .js-sort-select, and .js-filter-check. This should reduce runtime_target_gap findings in fixtures with search controls, filters, sortable product/catalog controls, and readable forms while leaving broader JS selector mining unchanged.

AI assistance

• AI assistance: Yes
• Tool(s): openai/gpt-5.5 via OpenCode
• Used for: Diagnosis, implementation, test updates, and PR description drafting.