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/config/resolve/anki-connect.test.ts

@@ -70,6 +70,20 @@ test('accepts knownWords.decks object format with field arrays', () => {
   );
 });
 
+test('accepts knownWords.addMinedWordsImmediately boolean override', () => {
+  const { context, warnings } = makeContext({
+    knownWords: { addMinedWordsImmediately: false },
+  });
+
+  applyAnkiConnectResolution(context);
+
+  assert.equal(context.resolved.ankiConnect.knownWords.addMinedWordsImmediately, false);
+  assert.equal(
+    warnings.some((warning) => warning.path === 'ankiConnect.knownWords.addMinedWordsImmediately'),
+    false,
+  );
+});
+
 test('converts legacy knownWords.decks array to object with default fields', () => {
   const { context, warnings } = makeContext({
     knownWords: { decks: ['Core Deck'] },