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Route bounded semantic accessibility actions - #553
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This was referenced Sep 19, 2026
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Closes #545. Advances #262 and enables SceneTech/AppScene#185.
WebScene semantic snapshots now advertise action capabilities and accept bounded generation-stamped native requests for focus, press, toggle, increment/decrement, set value, and UTF-16 text selection. Admission copies strict UTF-8 payloads and distinguishes invalid, stale, unsupported, full, and oversized requests. Worker dispatch revalidates the current snapshot, document/frame generations, semantic identity, connection, visibility, inert/disabled/read-only state, and capability; navigation, low memory, node retirement, and teardown discard stale work.
Bounds are 256 pending requests, 64 per worker batch, 64 KiB per value, and 1 MiB queued values. No platform objects cross the ABI.
Validation intentionally deferred:
git diff --checkpassed; native/C ABI/browser, cap, ordering, stale-generation, lifecycle, and performance regressions were authored but not executed. Live regions #546, measured deltas #547, and AppScene platform action/acceptance #185 remain open.