Pin mcp<1.10.0 to avoid win32api DLL regression on Windows

mcp 1.10+ introduced mcp.os.win32.utilities which imports win32api
at module load time. On Windows systems where pywin32 DLLs are not
fully registered, this causes an ImportError before the server or
--help can run. mcp 1.9.4 is the last known-good version.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: jgravelle

pyproject.toml

@@ -5,7 +5,7 @@ description = "Token-efficient MCP server for source code exploration via tree-s
 readme = "README.md"
 requires-python = ">=3.10"
 dependencies = [
-    "mcp>=1.0.0",
+    "mcp>=1.0.0,<1.10.0",
     "httpx>=0.27.0",
     "anthropic>=0.40.0",
     "tree-sitter-language-pack>=0.7.0",