feat(mcp): implement Git Operations MCP server with Gitea provider

Implements the Git Operations MCP server (Issue #58) providing:

Core features:
- GitPython wrapper for local repository operations (clone, commit, push, pull, diff, log)
- Branch management (create, delete, list, checkout)
- Workspace isolation per project with file-based locking
- Gitea provider for remote PR operations

MCP Tools (17 registered):
- clone_repository, git_status, create_branch, list_branches
- checkout, commit, push, pull, diff, log
- create_pull_request, get_pull_request, list_pull_requests
- merge_pull_request, get_workspace, lock_workspace, unlock_workspace

Technical details:
- FastMCP + FastAPI with JSON-RPC 2.0 protocol
- pydantic-settings for configuration (env prefix: GIT_OPS_)
- Comprehensive error hierarchy with structured codes
- 131 tests passing with 67% coverage
- Async operations via ThreadPoolExecutor

Closes: #105, #106, #107, #108, #109

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

mcp-servers/git-ops/config.py

@@ -0,0 +1,155 @@
+"""
+Configuration for Git Operations MCP Server.
+
+Uses pydantic-settings for environment variable loading.
+"""
+
+import os
+from pathlib import Path
+
+from pydantic import Field
+from pydantic_settings import BaseSettings
+
+
+class Settings(BaseSettings):
+    """Application settings loaded from environment."""
+
+    # Server settings
+    host: str = Field(default="0.0.0.0", description="Server host")
+    port: int = Field(default=8003, description="Server port")
+    debug: bool = Field(default=False, description="Debug mode")
+
+    # Workspace settings
+    workspace_base_path: Path = Field(
+        default=Path("/var/syndarix/workspaces"),
+        description="Base path for git workspaces",
+    )
+    workspace_max_size_gb: float = Field(
+        default=10.0,
+        description="Maximum size per workspace in GB",
+    )
+    workspace_stale_days: int = Field(
+        default=7,
+        description="Days after which unused workspace is considered stale",
+    )
+    workspace_lock_timeout: int = Field(
+        default=300,
+        description="Workspace lock timeout in seconds",
+    )
+
+    # Git settings
+    git_timeout: int = Field(
+        default=120,
+        description="Default timeout for git operations in seconds",
+    )
+    git_clone_timeout: int = Field(
+        default=600,
+        description="Timeout for clone operations in seconds",
+    )
+    git_author_name: str = Field(
+        default="Syndarix Agent",
+        description="Default author name for commits",
+    )
+    git_author_email: str = Field(
+        default="agent@syndarix.ai",
+        description="Default author email for commits",
+    )
+    git_max_diff_lines: int = Field(
+        default=10000,
+        description="Maximum lines in diff output",
+    )
+
+    # Redis settings (for distributed locking)
+    redis_url: str = Field(
+        default="redis://localhost:6379/0",
+        description="Redis connection URL",
+    )
+
+    # Provider settings
+    gitea_base_url: str = Field(
+        default="",
+        description="Gitea API base URL (e.g., https://gitea.example.com)",
+    )
+    gitea_token: str = Field(
+        default="",
+        description="Gitea API token",
+    )
+    github_token: str = Field(
+        default="",
+        description="GitHub API token",
+    )
+    github_api_url: str = Field(
+        default="https://api.github.com",
+        description="GitHub API URL (for Enterprise)",
+    )
+    gitlab_token: str = Field(
+        default="",
+        description="GitLab API token",
+    )
+    gitlab_url: str = Field(
+        default="https://gitlab.com",
+        description="GitLab URL (for self-hosted)",
+    )
+
+    # Rate limiting
+    rate_limit_requests: int = Field(
+        default=100,
+        description="Max API requests per minute per provider",
+    )
+    rate_limit_window: int = Field(
+        default=60,
+        description="Rate limit window in seconds",
+    )
+
+    # Retry settings
+    retry_attempts: int = Field(
+        default=3,
+        description="Number of retry attempts for failed operations",
+    )
+    retry_delay: float = Field(
+        default=1.0,
+        description="Initial retry delay in seconds",
+    )
+    retry_max_delay: float = Field(
+        default=30.0,
+        description="Maximum retry delay in seconds",
+    )
+
+    # Security settings
+    allowed_hosts: list[str] = Field(
+        default_factory=list,
+        description="Allowed git host domains (empty = all)",
+    )
+    max_clone_size_mb: int = Field(
+        default=500,
+        description="Maximum repository size for clone in MB",
+    )
+    enable_force_push: bool = Field(
+        default=False,
+        description="Allow force push operations",
+    )
+
+    model_config = {"env_prefix": "GIT_OPS_", "env_file": ".env", "extra": "ignore"}
+
+
+# Global settings instance (lazy initialization)
+_settings: Settings | None = None
+
+
+def get_settings() -> Settings:
+    """Get the global settings instance."""
+    global _settings
+    if _settings is None:
+        _settings = Settings()
+    return _settings
+
+
+def reset_settings() -> None:
+    """Reset the global settings (for testing)."""
+    global _settings
+    _settings = None
+
+
+def is_test_mode() -> bool:
+    """Check if running in test mode."""
+    return os.getenv("IS_TEST", "").lower() in ("true", "1", "yes")