fix: resolve CI linting and type errors

src/promptforge/core/__init__.py

@@ -0,0 +1,28 @@
+"""Core prompt management modules."""
+
+from .prompt import Prompt, PromptVariable
+from .template import TemplateEngine
+from .config import Config
+from .git_manager import GitManager
+from .exceptions import (
+    InvalidPromptError,
+    ProviderError,
+    ValidationError,
+    GitError,
+    RegistryError,
+    MissingVariableError,
+)
+
+__all__ = [
+    "Prompt",
+    "PromptVariable",
+    "TemplateEngine",
+    "Config",
+    "GitManager",
+    "InvalidPromptError",
+    "ProviderError",
+    "ValidationError",
+    "GitError",
+    "RegistryError",
+    "MissingVariableError",
+]