Update src/qa.py

src/qa.py

@@ -22,6 +22,25 @@ from gen_ai_hub.proxy.langchain.openai import ChatOpenAI
 
 print("✅ qa.py (GPT-4o via Gen AI Hub + Bullet-Aware Retrieval + Cache) loaded from:", __file__)
 
+# ==========================================================
+# 🧱 Permanent Embedding Cache Directory
+# ==========================================================
+CACHE_EMB_DIR = os.path.join(os.path.dirname(__file__), "embed_cache")
+os.makedirs(CACHE_EMB_DIR, exist_ok=True)
+
+# Verify write permission
+try:
+    test_file = os.path.join(CACHE_EMB_DIR, "test_write.tmp")
+    with open(test_file, "w") as f:
+        f.write("ok")
+    os.remove(test_file)
+    print(f"✅ Cache directory ready and writable: {CACHE_EMB_DIR}")
+except Exception as e:
+    print(f"⚠️ Cache directory not writable ({CACHE_EMB_DIR}): {e}")
+    CACHE_EMB_DIR = "/tmp/embed_cache"
+    os.makedirs(CACHE_EMB_DIR, exist_ok=True)
+    print(f"🔄 Fallback to temporary cache: {CACHE_EMB_DIR}")
+
 # ==========================================================
 # 1️⃣ Hugging Face Cache Setup
 # ==========================================================