fix(gitea-mcp): use project directory for branch detection (#231)

The _get_current_branch() method was running git commands from the
installed plugin directory instead of the user's project directory.
This caused incorrect branch detection (always seeing 'main' from
the marketplace repo instead of the user's actual branch).

Fix: Use CLAUDE_PROJECT_DIR environment variable to get the correct
project directory and pass it as cwd to subprocess.run().

Fixes #231

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

mcp-servers/gitea/mcp_server/tools/pull_requests.py

@@ -7,6 +7,7 @@ Provides async wrappers for PR operations with:
 - Comprehensive error handling
 """
 import asyncio
+import os
 import subprocess
 import logging
 from typing import List, Dict, Optional
@@ -27,19 +28,34 @@ class PullRequestTools:
         """
         self.gitea = gitea_client
 
+    def _get_project_directory(self) -> Optional[str]:
+        """
+        Get the user's project directory from environment.
+
+        Returns:
+            Project directory path or None if not set
+        """
+        return os.environ.get('CLAUDE_PROJECT_DIR')
+
     def _get_current_branch(self) -> str:
         """
-        Get current git branch.
+        Get current git branch from user's project directory.
+
+        Uses CLAUDE_PROJECT_DIR environment variable to determine the correct
+        directory for git operations, avoiding the bug where git runs from
+        the installed plugin directory instead of the user's project.
 
         Returns:
             Current branch name or 'unknown' if not in a git repo
         """
         try:
+            project_dir = self._get_project_directory()
             result = subprocess.run(
                 ['git', 'rev-parse', '--abbrev-ref', 'HEAD'],
                 capture_output=True,
                 text=True,
-                check=True
+                check=True,
+                cwd=project_dir  # Run git in project directory, not plugin directory
             )
             return result.stdout.strip()
         except subprocess.CalledProcessError: