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>

web/app.py

@@ -97,13 +97,26 @@ with app.app_context():
 import threading as _threading
 
 def _start_huey_consumer():
+    import logging as _logging
+    _logging.basicConfig(level=_logging.WARNING)
     try:
         from huey.consumer import Consumer
-        consumer = Consumer(huey, workers=1, worker_type='thread', loglevel=20)
-        print("✅ System: Huey task consumer started.")
+        consumer = Consumer(huey, workers=1, worker_type='thread')
+        print("System: Huey task consumer started.")
         consumer.run()
     except Exception as e:
-        print(f"⚠️ System: Huey consumer failed to start: {e}")
+        msg = f"System: Huey consumer failed to start: {e}"
+        print(msg)
+        # Write the error to a persistent log so it is visible even when stdout is lost
+        try:
+            import os as _os
+            from core import config as _cfg
+            _err_path = _os.path.join(_cfg.DATA_DIR, "consumer_error.log")
+            with open(_err_path, 'a', encoding='utf-8') as _f:
+                import datetime as _dt
+                _f.write(f"[{_dt.datetime.now()}] {msg}\n")
+        except Exception:
+            pass
 
 _is_reloader_child = os.environ.get('WERKZEUG_RUN_MAIN') == 'true'
 _is_testing = os.environ.get('FLASK_TESTING') == '1'