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Publish bounded semantic snapshots for accessibility - #542
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This was referenced Sep 19, 2026
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Closes #541. Advances #262 and #268; enables SceneTech/AppScene#30.
WebScene now publishes a bounded immutable semantic snapshot for top-level and nested documents, with deterministic tree structure, generations, roles, computed text, states, relationships, focus, origins, and transformed bounds. Request-driven worker construction avoids per-frame scans, and epoch-protected retirement prevents stale publication while preserving acquired lease lifetime.
Validation intentionally deferred under the current fast-merge instruction:
git diff --checkpassed; focused native, ABI, contract, lifecycle, cap, and performance regressions were authored but not executed. AppScene native peer publication and semantic action/live-region follow-ups remain tracked.