Parent: #262. Provider prerequisite: #541/#542. Platform consumer: SceneTech/AppScene#30.
Publish a bounded generation-aware stream of semantic live-region changes for polite/assertive/status/alert/log behavior. Coalesce mutations according to aria-live/atomic/relevant semantics, preserve deterministic order, cap retained text/events, prevent announcements from hidden/detached/stale documents, and retire queues on navigation/teardown. AppScene owns native announcement delivery.
Acceptance includes Chromium-shaped browser contracts, worker/native ordering and cap regressions, terminal/problems/tasks/chat scenarios, duplicate suppression, and lifecycle/memory/performance gates. Execution and platform announcement acceptance remain deferred.
Parent: #262. Provider prerequisite: #541/#542. Platform consumer: SceneTech/AppScene#30.
Publish a bounded generation-aware stream of semantic live-region changes for polite/assertive/status/alert/log behavior. Coalesce mutations according to aria-live/atomic/relevant semantics, preserve deterministic order, cap retained text/events, prevent announcements from hidden/detached/stale documents, and retire queues on navigation/teardown. AppScene owns native announcement delivery.
Acceptance includes Chromium-shaped browser contracts, worker/native ordering and cap regressions, terminal/problems/tasks/chat scenarios, duplicate suppression, and lifecycle/memory/performance gates. Execution and platform announcement acceptance remain deferred.