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/agent/test_subagent.py

@@ -25,7 +25,6 @@ async def test_subagent_uses_tool_loader():
     tools = sm._build_tools()
     assert tools.has("read_file")
     assert tools.has("write_file")
-    assert tools.has("glob")
     assert not tools.has("message")
     assert not tools.has("spawn")
 

tests/agent/test_tool_hint.py

@@ -34,10 +34,6 @@ class TestToolHintKnownTools:
         assert "main.py" in result
         assert "edit " in result
 
-    def test_glob_shows_pattern(self):
-        result = _hint([_tc("glob", {"pattern": "**/*.py", "path": "src"})])
-        assert result == 'glob "**/*.py"'
-
     def test_grep_shows_pattern(self):
         result = _hint([_tc("grep", {"pattern": "TODO|FIXME", "path": "src"})])
         assert result == 'grep "TODO|FIXME"'