feat: add review_pending_changes tool and enforce absolute path security

- Add new review_pending_changes tool for comprehensive pre-commit reviews
- Implement filesystem sandboxing with MCP_PROJECT_ROOT
- Enforce absolute paths for all file/directory operations
- Add comprehensive git utilities for repository management
- Update all tools to use centralized path validation
- Add extensive test coverage for new features and security model
- Update documentation with new tool and path requirements
- Remove obsolete demo and guide files

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

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

tools/debug_issue.py

@@ -23,7 +23,8 @@ class DebugIssueRequest(ToolRequest):
         None, description="Stack trace, logs, or additional error context"
     )
     files: Optional[List[str]] = Field(
-        None, description="Files or directories that might be related to the issue"
+        None,
+        description="Files or directories that might be related to the issue (must be absolute paths)",
     )
     runtime_info: Optional[str] = Field(
         None, description="Environment, versions, or runtime information"
@@ -63,7 +64,7 @@ class DebugIssueTool(BaseTool):
                 "files": {
                     "type": "array",
                     "items": {"type": "string"},
-                    "description": "Files or directories that might be related to the issue",
+                    "description": "Files or directories that might be related to the issue (must be absolute paths)",
                 },
                 "runtime_info": {
                     "type": "string",