Publish bounded semantic live-region events - #558
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Closes #546. Advances #262 and enables SceneTech/AppScene#185.
WebScene now publishes bounded immutable semantic live-region event leases with ordered sequences, document/frame generations, stable region identity, role, politeness, relevant/atomic/busy/initial/truncation flags, UTF-8 text, batch generation, and explicit dropped-event accounting. The worker supports explicit aria-live plus implicit status/alert/log, composed-tree coalescing, atomic/relevant/busy behavior, duplicate suppression, initial-alert-only behavior, nested ownership, hidden/inert/detached exclusion, and navigation/low-memory/teardown race retirement.
Bounds: 256 queued events, 64 per lease, 64 KiB per event, 1 MiB text, 256 live regions, 4,096 fragments per region, and 16,384 DOM visits per checkpoint. Partial scans fail closed and loss is reported.
Validation intentionally deferred:
git diff --checkpassed; native/C ABI/browser, terminal/problems/tasks/chat, cap, ordering, lifecycle and performance regressions were authored but not executed. AppScene announcement delivery #185, UIA/AT-SPI #183/#184, measured deltas #547, and packaged VoiceOver/Narrator/Orca acceptance remain open.