fix(flow): improve tail capture and final chunk ASR recovery

- Add FlowUtteranceEndCoordinator with 350ms silence drain and 150ms post-roll - Extend FinalChunkRecovery for short/empty final chunks in chunked pipeline - Snapshot partial at mic stop and guard final transcript in FlowSessionManager - Unify tail drain presets (iosFlow/macMLX) and expand diagnostics Co-authored-by: Rocky <hkgood@users.noreply.github.com>
2026-07-26 10:13:40 +00:00
parent e6f99d2744
commit c7ee891a90
16 changed files with 485 additions and 42 deletions
@@ -558,12 +558,10 @@ public final class LiveDictationController: ObservableObject {
        drainTracker.beginDrain()

        let policy = FlowCaptureTailDrainPolicy.flowDefault
-        while true {
-            let decision = drainTracker.shouldFinish(policy: policy)
-            if decision.finished { break }
-            if Task.isCancelled { break }
-            try? await Task.sleep(nanoseconds: 20_000_000)
-        }
+        _ = await FlowUtteranceEndCoordinator.awaitTailCapture(
+            tracker: drainTracker,
+            policy: policy
+        )

        // Trailing speech is preserved by the live `.draining` forwarding
        // loop above. We deliberately do NOT signal `.endOfStream` to the