docs: implementation plan for the five user-reported site-builder issues
23 TDD tasks across five phases: HTML block (render/export mismatch, code-only panel, editor toolbar), tree integrity (orphan repair + Unplaced recovery), reset page/site, Layers virtual rows for array-prop composites, and in-builder issue reporting (endpoint, table, root-only admin page). Off-canvas drop prevention is scoped as an investigation whose acceptance criterion is a written mechanism, not a guessed fix. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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