fix: track Laya language batches and normalize labels (#22)

Report post-projection Laya language detection as a busy analysis phase and normalize Laya language labels before caching and display.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

test/layaService.test.js

@@ -152,8 +152,8 @@ test('language batch sends the Laya contract and parses language confidence with
                 ok: true,
                 json: async () => ({
                     results: [
-                        { answers: { language: { choice: 'fr', answer_confidence: 0.93 } } },
-                        { answers: { language: { choice: 'en', confidence: 0.81 } } }
+                        { answers: { language: { choice: 'French', answer_confidence: 0.93 } } },
+                        { answers: { language: { choice: 'English', confidence: 0.81 } } }
                     ]
                 })
             };
@@ -181,6 +181,45 @@ test('language batch sends the Laya contract and parses language confidence with
     });
 });
 
+test('language batch preserves explicit other and maps an unfamiliar label to unknown', async () => {
+    const service = new LayaService({
+        cache: null,
+        fetch: async () => ({
+            ok: true,
+            json: async () => ({
+                results: [
+                    { answers: { language: { choice: 'Other', confidence: 0.72 } } },
+                    { answers: { language: { choice: 'Klingon', confidence: 0.99 } } }
+                ]
+            })
+        })
+    });
+
+    const response = await service.detectBatch({
+        items: [{ id: 'other', text: 'Autre' }, { id: 'strange', text: 'Qapla' }]
+    });
+
+    assert.deepEqual(response.results, [
+        { id: 'other', language: 'other', confidence: 0.72, cached: false },
+        { id: 'strange', language: 'unknown', confidence: 0.99, cached: false }
+    ]);
+});
+
+test('language batch rejects a successful HTTP response without a usable language answer', async () => {
+    const service = new LayaService({
+        cache: null,
+        fetch: async () => ({
+            ok: true,
+            json: async () => ({ results: [{ answers: { language: { confidence: 0.9 } } }] })
+        })
+    });
+
+    await assert.rejects(
+        service.detectBatch({ items: [{ id: 'missing', text: 'Missing language' }] }),
+        error => error instanceof LayaRequestError && error.statusCode === 502
+    );
+});
+
 test('identity hints send only sanitized channel metadata to Laya', async () => {
     let requestBody;
     const service = new LayaService({