Merge PR #291: feat: add MCP (Model Context Protocol) client support

Authored by 0xbyt4. Adds MCP client with official SDK, direct tool registration,
auto-injection into hermes-* toolsets, and graceful degradation.

cli.py

@@ -386,6 +386,11 @@ def _run_cleanup():
         _cleanup_all_browsers()
     except Exception:
         pass
+    try:
+        from tools.mcp_tool import shutdown_mcp_servers
+        shutdown_mcp_servers()
+    except Exception:
+        pass
 
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