feat(stats): add launcher stats command and build integration

- Launcher stats subcommand with cleanup mode
- Stats frontend build integrated into Makefile
- CI workflow updated for stats package
- Config example updated with stats section
- mpv plugin menu entry for stats toggle

launcher/parse-args.test.ts

@@ -58,3 +58,26 @@ test('parseArgs maps dictionary command and log-level override', () => {
   assert.equal(parsed.dictionaryTarget, process.cwd());
   assert.equal(parsed.logLevel, 'debug');
 });
+
+test('parseArgs maps stats command and log-level override', () => {
+  const parsed = parseArgs(['stats', '--log-level', 'debug'], 'subminer', {});
+
+  assert.equal(parsed.stats, true);
+  assert.equal(parsed.logLevel, 'debug');
+});
+
+test('parseArgs maps stats cleanup to vocab mode by default', () => {
+  const parsed = parseArgs(['stats', 'cleanup'], 'subminer', {});
+
+  assert.equal(parsed.stats, true);
+  assert.equal(parsed.statsCleanup, true);
+  assert.equal(parsed.statsCleanupVocab, true);
+});
+
+test('parseArgs maps explicit stats cleanup vocab flag', () => {
+  const parsed = parseArgs(['stats', 'cleanup', '-v'], 'subminer', {});
+
+  assert.equal(parsed.stats, true);
+  assert.equal(parsed.statsCleanup, true);
+  assert.equal(parsed.statsCleanupVocab, true);
+});