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/test_nanobot_facade.py

@@ -190,7 +190,7 @@ async def test_run_populates_tools_used_across_iterations(tmp_path):
         ctx1 = AgentHookContext(iteration=0, messages=messages)
         ctx1.tool_calls = [
             ToolCallRequest(id="c1", name="read_file", arguments={}),
-            ToolCallRequest(id="c2", name="glob", arguments={}),
+            ToolCallRequest(id="c2", name="grep", arguments={}),
         ]
         for h in extras:
             await h.after_iteration(ctx1)
@@ -204,7 +204,7 @@ async def test_run_populates_tools_used_across_iterations(tmp_path):
     bot._loop.process_direct = fake_process_direct
     result = await bot.run("do stuff")
     assert result.content == "final"
-    assert result.tools_used == ["read_file", "glob", "web_fetch"]
+    assert result.tools_used == ["read_file", "grep", "web_fetch"]
 
 
 @pytest.mark.asyncio