fix(overlay): defer autoplay release for untokenized startup priming

- Autoplay-ready gate now ignores untokenized subtitle payloads while tokenization warmup is pending, so playback doesn't resume before the first tokenized cue
- Wire isTokenizationReady dep through main.ts and update gate/wiring tests accordingly
- Drop stale release/release-notes.md, add changelog entry under changes/

src/main/runtime/autoplay-ready-gate.ts

@@ -26,6 +26,7 @@ export type AutoplayReadyGateDeps = {
   getPlaybackPaused: () => boolean | null;
   getMpvClient: () => MpvClientLike | null;
   signalPluginAutoplayReady: () => void;
+  isTokenizationReady?: () => boolean;
   requestOverlayPointerRecovery?: () => void;
   onAutoplayReadyReleased?: (signal: AutoplayReadySignal) => void;
   isSignalTargetReady?: (signal: AutoplayReadySignal) => boolean;
@@ -217,6 +218,15 @@ export function createAutoplayReadyGate(deps: AutoplayReadyGateDeps) {
     if (!payload.text.trim()) {
       return;
     }
+    // Untokenized payloads (startup subtitle priming, tokenizer fallbacks) must
+    // not release the startup pause gate while tokenization warmup is pending —
+    // the tokenized delivery or the post-warmup release signals readiness later.
+    if (payload.tokens === null && deps.isTokenizationReady && !deps.isTokenizationReady()) {
+      deps.logDebug(
+        '[autoplay-ready] ignored untokenized signal while tokenization warmup is pending',
+      );
+      return;
+    }
 
     maybeReleaseAutoplayReadySignal({
       mediaPath: getSignalMediaPath(),