feat: implement modular capability system with automatic discovery

- Move release management to capabilities/release-management/ with complete Makefile
- Create automatic capability discovery system in scripts/capability_discovery.mk
- Add capability-manager subagent for managing modular architecture
- Implement target delegation system enabling capability-name-target patterns
- Create Makefiles for markitect-content, markitect-utils, and issue-facade capabilities
- Remove legacy release management code and documentation from main project
- Update main Makefile to use capability discovery and delegation
- Add comprehensive capability status, help, and management targets

The capability system provides:
- Automatic discovery of capabilities with Makefiles
- Clean target delegation without conflicts
- Modular architecture following established patterns
- Comprehensive help and status reporting
- Zero-conflict capability integration

🤖 Generated with [Claude Code](https://claude.ai/code)

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

capabilities/release-management/src/release_management/registries/base.py

@@ -0,0 +1,101 @@
+"""
+Base registry interface and configuration.
+
+This module defines the common interface that all registry implementations must follow.
+"""
+
+from abc import ABC, abstractmethod
+from pathlib import Path
+from typing import Dict, List, Optional, Any
+from dataclasses import dataclass
+
+
+@dataclass
+class RegistryConfig:
+    """Base configuration for package registries."""
+    name: str
+    type: str
+    url: str
+    auth_token_env: Optional[str] = None
+
+    def get_auth_token(self) -> Optional[str]:
+        """Get authentication token from environment variable."""
+        if self.auth_token_env:
+            import os
+            return os.getenv(self.auth_token_env)
+        return None
+
+
+class RegistryInterface(ABC):
+    """Abstract interface for package registries."""
+
+    def __init__(self, config: RegistryConfig):
+        """Initialize the registry with configuration."""
+        self.config = config
+
+    @abstractmethod
+    def upload_package(self, package_path: Path, dry_run: bool = False) -> bool:
+        """Upload a package to the registry.
+
+        Args:
+            package_path: Path to package file (.whl or .tar.gz)
+            dry_run: If True, show what would be done without uploading
+
+        Returns:
+            True if upload successful, False otherwise
+        """
+        pass
+
+    @abstractmethod
+    def check_auth(self) -> bool:
+        """Check if authentication is properly configured.
+
+        Returns:
+            True if authenticated, False otherwise
+        """
+        pass
+
+    @abstractmethod
+    def list_packages(self) -> List[Dict[str, Any]]:
+        """List packages in the registry.
+
+        Returns:
+            List of package information dictionaries
+        """
+        pass
+
+    @abstractmethod
+    def get_package_info(self, package_name: str) -> Optional[Dict[str, Any]]:
+        """Get information about a specific package.
+
+        Args:
+            package_name: Name of the package
+
+        Returns:
+            Package information dictionary or None if not found
+        """
+        pass
+
+    @abstractmethod
+    def delete_package_version(self, package_name: str, version: str,
+                              dry_run: bool = False) -> bool:
+        """Delete a specific version of a package.
+
+        Args:
+            package_name: Name of the package
+            version: Version to delete
+            dry_run: If True, show what would be done without deleting
+
+        Returns:
+            True if deletion successful, False otherwise
+        """
+        pass
+
+    @abstractmethod
+    def get_registry_info(self) -> Dict[str, Any]:
+        """Get information about the registry configuration.
+
+        Returns:
+            Dictionary with registry information
+        """
+        pass