Refine Figma DOM box classification

[chubes4]

Summary

• Finalized Homeboy agent-task cook run figma-wave3-hairline-recovery-finalize into review-ready branch fix/figma-dom-box-classification.

Proof provenance

• Proof runner: Homeboy agent-task cook loop
• Proof ID: agent-task-finalization:figma-wave3-hairline-recovery-finalize
• Homeboy run ID: figma-wave3-hairline-recovery-finalize
• Manual proof: none recorded by this Homeboy finalization

Publication intent

• Schema: homeboy/agent-task-publication-intent/v1
• Action: review_request
• Target kind: code_review
• Adapter: github_pull_request
• Base: trunk
• Head: fix/figma-dom-box-classification

Source refs

• Refine Figma DOM box classification #599
• Lab cook cannot promote or retrieve successful agent-task patch artifacts Extra-Chill/homeboy#8077

Source relationship

• Related finding ID: none recorded
• Source packet ID: none recorded
• Change kind: runtime-fix
• Supersedes: none recorded
• Depends on: none recorded

Runtime guardrails

• Why this is not broader than the packet evidence: Only source-faithful visible LINE/VECTOR zero-axis hairlines gain the renderer rounding exception.
• Evidence discriminators preserved: source visual axis 0.0 rendered as a positive DOM axis <=1px
• Nearby contracts preserved: missing, non-finite, negative, invisible, both-axis, mismatched, and ordinary content collapse still warn

Attempt summary

Recovered after Homeboy Lab promotion gap #8077; independent review findings corrected and deterministic gates passed.

Gate results

• php-contracts: passed (targeted)
• browser-contracts: passed (targeted)
• independent-review: passed (targeted)

Verification capability

• targeted_checks_run: composer --working-dir=figma-transformer test, npm test --prefix php-transformer/tools/visual-parity, git diff --check
• targeted_checks_unavailable: none recorded
• ci_expected: none recorded
• manual_reviewer_check: none recorded

CI-equivalent coverage

• CI-equivalent required gate: CI-equivalent required gate was not recorded; targeted proof must not be treated as full CI coverage

Changed files

• figma-transformer/scripts/figma-fixture-matrix-quality.php
• figma-transformer/tests/contract/FixtureMatrixContract.php

Artifact refs

• none recorded

Final status

• Status: review-ready
• Base: trunk
• Head: fix/figma-dom-box-classification
• Merge/deploy: not performed

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode via Homeboy
• Model: openai/gpt-5.6-sol
• Used for: Diagnosed real-file DOM evidence, implemented the classifier correction, and independently reviewed contract coverage.