Step 6a & 6b: Clean up orphan code in __init__.py

- Remove orphan exports: register_function, list_functions, get_model, get_max_tokens, get_temperature, MODEL_CONFIG
- Remove unused imports: register_function, list_functions, get_model, get_max_tokens, get_temperature, MODEL_CONFIG
- Keep only actively used exports and imports
- get_function remains (used internally)

backend/igny8_core/ai/__init__.py

@@ -3,7 +3,7 @@ IGNY8 AI Framework
 Unified framework for all AI functions with consistent lifecycle, progress tracking, and logging.
 """
 
-from igny8_core.ai.registry import register_function, get_function, list_functions
+from igny8_core.ai.registry import get_function
 from igny8_core.ai.engine import AIEngine
 from igny8_core.ai.base import BaseAIFunction
 from igny8_core.ai.ai_core import AICore
@@ -27,11 +27,7 @@ from igny8_core.ai.constants import (
 )
 from igny8_core.ai.prompts import PromptRegistry, get_prompt
 from igny8_core.ai.settings import (
-    MODEL_CONFIG,
     get_model_config,
-    get_model,
-    get_max_tokens,
-    get_temperature,
 )
 
 # Don't auto-import functions here - let apps.py handle it lazily
@@ -41,9 +37,7 @@ __all__ = [
     'AIEngine',
     'BaseAIFunction',
     'AICore',
-    'register_function',
     'get_function',
-    'list_functions',
     # Validators
     'validate_ids',
     'validate_keywords_exist',
@@ -64,10 +58,6 @@ __all__ = [
     'PromptRegistry',
     'get_prompt',
     # Settings
-    'MODEL_CONFIG',
     'get_model_config',
-    'get_model',
-    'get_max_tokens',
-    'get_temperature',
 ]