Auto-commit: v2.10 — Fix Huey consumer never starting (loglevel= TypeError)

Root cause: Consumer(huey, workers=1, worker_type='thread', loglevel=20)
raised TypeError on every app start because Huey 2.6.0 does not accept
a `loglevel` keyword argument. The exception was silently caught and only
printed to stdout, so the consumer never ran and all tasks stayed 'queued'
forever — causing the 'Preparing environment / Waiting for logs' hang.

Fixes:
- web/app.py: Remove invalid `loglevel=20` from Consumer(); configure
  Huey logging via logging.basicConfig(WARNING) instead. Add persistent
  error logging to data/consumer_error.log for future diagnosis.
- core/config.py: Replace emoji print() calls with ASCII-safe equivalents
  to prevent UnicodeEncodeError on Windows cp1252 terminals at import time.
- core/config.py: Update VERSION to 2.9 (was stale at 1.5.0).
- ai_blueprint.md: Bump to v2.10, document root cause and fixes.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

core/config.py

@@ -27,9 +27,9 @@ ADMIN_USER = get_clean_env("ADMIN_USERNAME")
 ADMIN_PASSWORD = get_clean_env("ADMIN_PASSWORD")
 
 if FLASK_SECRET == "dev-secret-key-change-this":
-    print("⚠️ WARNING: Using default FLASK_SECRET_KEY. This is insecure for production.")
+    print("WARNING: Using default FLASK_SECRET_KEY. This is insecure for production.")
 
-if not API_KEY: raise ValueError("❌ CRITICAL ERROR: GEMINI_API_KEY not found.")
+if not API_KEY: raise ValueError("CRITICAL ERROR: GEMINI_API_KEY not found in environment or .env file.")
 
 # --- DATA DIRECTORIES ---
 DATA_DIR = os.path.join(BASE_DIR, "data")
@@ -51,7 +51,7 @@ if GOOGLE_CREDS:
     if os.path.exists(GOOGLE_CREDS):
         os.environ["GOOGLE_APPLICATION_CREDENTIALS"] = GOOGLE_CREDS
     else:
-        print(f"⚠️ Warning: GOOGLE_APPLICATION_CREDENTIALS file not found at: {GOOGLE_CREDS}")
+        print(f"Warning: GOOGLE_APPLICATION_CREDENTIALS file not found at: {GOOGLE_CREDS}")
 
 # --- DEFINITIONS ---
 LENGTH_DEFINITIONS = {
@@ -65,4 +65,4 @@ LENGTH_DEFINITIONS = {
 }
 
 # --- SYSTEM ---
-VERSION = "1.5.0"
+VERSION = "2.9"