refactor(tools): remove GlobTool

GlobTool is redundant — GrepTool already supports glob-based file
filtering via its `glob` parameter, making a standalone glob-only
tool unnecessary. Removing it simplifies the tool surface and reduces
LLM confusion between glob and grep.

tests/tools/test_tool_loader.py

@@ -406,7 +406,7 @@ def test_loader_registers_same_tools_as_old_hardcoded():
 
     expected = {
         "read_file", "write_file", "edit_file", "list_dir",
-        "glob", "grep", "notebook_edit", "exec", "web_search", "web_fetch",
+        "grep", "notebook_edit", "exec", "web_search", "web_fetch",
         "message", "spawn", "cron",
     }
     actual = set(registered)