Switch known-word cache to incremental sync and doctor refresh

- Load persisted known-word cache on startup; reconcile adds/deletes/edits on timed sync
- Add `knownWords.addMinedWordsImmediately` (default `true`) for immediate mined-word updates
- Route full rebuild to explicit `subminer doctor --refresh-known-words` and expand tests/docs

src/core/services/startup.test.ts

@@ -93,3 +93,104 @@ test('runAppReadyRuntime minimal startup skips Yomitan and first-run setup while
 
   assert.deepEqual(calls, ['bootstrap', 'reload-config', 'handle-initial-args']);
 });
+
+test('runAppReadyRuntime headless refresh bootstraps Anki runtime without UI startup', async () => {
+  const calls: string[] = [];
+
+  await runAppReadyRuntime({
+    ensureDefaultConfigBootstrap: () => {
+      calls.push('bootstrap');
+    },
+    loadSubtitlePosition: () => {
+      calls.push('load-subtitle-position');
+    },
+    resolveKeybindings: () => {
+      calls.push('resolve-keybindings');
+    },
+    createMpvClient: () => {
+      calls.push('create-mpv');
+    },
+    reloadConfig: () => {
+      calls.push('reload-config');
+    },
+    getResolvedConfig: () => ({}),
+    getConfigWarnings: () => [],
+    logConfigWarning: () => {
+      calls.push('config-warning');
+    },
+    setLogLevel: () => {
+      calls.push('set-log-level');
+    },
+    initRuntimeOptionsManager: () => {
+      calls.push('init-runtime-options');
+    },
+    setSecondarySubMode: () => {
+      calls.push('set-secondary-sub-mode');
+    },
+    defaultSecondarySubMode: 'hover',
+    defaultWebsocketPort: 0,
+    defaultAnnotationWebsocketPort: 0,
+    defaultTexthookerPort: 0,
+    hasMpvWebsocketPlugin: () => false,
+    startSubtitleWebsocket: () => {
+      calls.push('subtitle-ws');
+    },
+    startAnnotationWebsocket: () => {
+      calls.push('annotation-ws');
+    },
+    startTexthooker: () => {
+      calls.push('texthooker');
+    },
+    log: () => {
+      calls.push('log');
+    },
+    createMecabTokenizerAndCheck: async () => {
+      calls.push('mecab');
+    },
+    createSubtitleTimingTracker: () => {
+      calls.push('subtitle-timing');
+    },
+    createImmersionTracker: () => {
+      calls.push('immersion');
+    },
+    startJellyfinRemoteSession: async () => {
+      calls.push('jellyfin');
+    },
+    loadYomitanExtension: async () => {
+      calls.push('load-yomitan');
+    },
+    handleFirstRunSetup: async () => {
+      calls.push('first-run');
+    },
+    prewarmSubtitleDictionaries: async () => {
+      calls.push('prewarm');
+    },
+    startBackgroundWarmups: () => {
+      calls.push('warmups');
+    },
+    texthookerOnlyMode: false,
+    shouldAutoInitializeOverlayRuntimeFromConfig: () => false,
+    setVisibleOverlayVisible: () => {
+      calls.push('visible-overlay');
+    },
+    initializeOverlayRuntime: () => {
+      calls.push('init-overlay');
+    },
+    runHeadlessInitialCommand: async () => {
+      calls.push('run-headless-command');
+    },
+    handleInitialArgs: () => {
+      calls.push('handle-initial-args');
+    },
+    shouldRunHeadlessInitialCommand: () => true,
+    shouldUseMinimalStartup: () => false,
+    shouldSkipHeavyStartup: () => false,
+  });
+
+  assert.deepEqual(calls, [
+    'bootstrap',
+    'reload-config',
+    'init-runtime-options',
+    'run-headless-command',
+  ]);
+});