fix(hachidori): keep the hachidori tag alongside SubMiner's Anki tags

- Untouched default templates now get configured tags plus `hachidori` instead of replacing it
- Tags edited in Hachidori settings are left as written
- Update Anki integration docs and changelog fragment

src/core/services/tokenizer/hachidori-anki-settings.test.ts

@@ -83,7 +83,7 @@ test('fresh Hachidori settings inherit deck, tags, a unique model and configured
   assert.deepEqual(await h.sync(), { updated: true, matched: true, pending: false });
   assert.deepEqual(
     await h.run('[options.anki.url, options.anki.deck, options.anki.model, options.anki.tags]'),
-    ['http://127.0.0.1:8766', 'Mining', 'Japanese', config.tags],
+    ['http://127.0.0.1:8766', 'Mining', 'Japanese', [...config.tags, 'hachidori']],
   );
   assert.deepEqual(
     await h.run(
@@ -102,6 +102,16 @@ test('fresh Hachidori settings inherit deck, tags, a unique model and configured
   assert.equal(await h.run('writes'), 1);
 });
 
+test('leaves tags edited in Hachidori settings alone', async () => {
+  const h = await harness({
+    templates: [
+      { id: 'default', name: 'Default', deck: 'Mining', model: 'Japanese', tags: ['SubMiner'] },
+    ],
+  });
+  await h.sync();
+  assert.deepEqual(await h.run('options.anki.tags'), ['SubMiner']);
+});
+
 // SubMiner's new-card polling only watches ankiConnect.deck, so the first
 // template's deck follows it the way Yomitan's term card deck does.
 test('moves the first template to the SubMiner deck and preserves the rest of custom templates', async () => {

src/core/services/tokenizer/hachidori-anki-settings.ts

@@ -49,8 +49,10 @@ export const HACHIDORI_ANKI_SETTINGS_SCRIPT = String.raw`
         // SubMiner's new-card polling only watches its configured deck, so the
         // first template follows it like Yomitan's term card deck.
         if (deck) template.deck = deck;
+        // SubMiner's tags join Hachidori's own so cards show which backend mined
+        // them. Only the untouched default is filled; edits in Hachidori settings win.
         if (hints?.tags && JSON.stringify(first.tags) === JSON.stringify(['hachidori'])) {
-          template.tags = [...hints.tags];
+          template.tags = [...new Set([...hints.tags, 'hachidori'])];
         }
         let pending = false;
         // Advanced templates include intentionally blank fields. Preserve them