fix: register aitbc_cli.core in sys.modules before loading core/main.py

- Register aitbc_cli.core module pointing to core/ directory before loading
- Register aitbc_cli.core.main in sys.modules before exec_module
- Fixes No module named 'aitbc_cli.core' error when core/main.py imports
- Allows core/main.py to import from aitbc_cli.commands.* correctly

cli/aitbc_cli/__init__.py

@@ -26,16 +26,30 @@ def __getattr__(name: str):
     if name not in __all__:
         raise AttributeError(f"module {__name__!r} has no attribute {name!r}")
 
-    # Load core/main.py directly via spec_from_file_location to avoid package resolution issues
+    # Set up sys.modules for proper package resolution
+    # core/ is a sibling of aitbc_cli/, but imports reference it as aitbc_cli.core
+    # We need to register these in sys.modules before loading core/main.py
     import importlib.util
     from pathlib import Path
     
-    cli_path = Path(__file__).parent.parent / "core" / "main.py"
-    spec = importlib.util.spec_from_file_location("aitbc_cli_core_main", cli_path)
+    cli_dir = Path(__file__).parent
+    core_dir = cli_dir.parent / "core"
+    
+    # Register aitbc_cli.core as a module pointing to the core/ directory
+    if "aitbc_cli.core" not in sys.modules:
+        core_spec = importlib.util.spec_from_file_location("aitbc_cli.core", core_dir / "__init__.py")
+        if core_spec and core_spec.loader:
+            core_module = importlib.util.module_from_spec(core_spec)
+            sys.modules["aitbc_cli.core"] = core_module
+    
+    # Load core/main.py and register it as aitbc_cli.core.main
+    cli_path = core_dir / "main.py"
+    spec = importlib.util.spec_from_file_location("aitbc_cli.core.main", cli_path)
     if spec is None or spec.loader is None:
         raise ImportError(f"Unable to load modular CLI entrypoint from {cli_path}")
     
     module = importlib.util.module_from_spec(spec)
+    sys.modules["aitbc_cli.core.main"] = module
     spec.loader.exec_module(module)
     
     value = module.cli if name == "cli" else module.main