core/tools/file: add glob_paths workspace search tool

Stdlib Path.glob with VCS/hidden skip and match cap; paths relative to
workspace root.

tests/test_tools/test_glob_paths.py

@@ -0,0 +1,42 @@
+from __future__ import annotations
+
+from pathlib import Path
+
+from plyngent.tools.file.glob_paths import glob_paths
+from tests.test_tools.helpers import call_sync
+
+
+def test_glob_paths_basic(workspace: object) -> None:
+    assert isinstance(workspace, Path)
+    _ = (workspace / "a.py").write_text("x", encoding="utf-8")
+    (workspace / "sub").mkdir()
+    _ = (workspace / "sub" / "b.py").write_text("y", encoding="utf-8")
+    _ = (workspace / "c.txt").write_text("z", encoding="utf-8")
+    out = call_sync(glob_paths, "**/*.py")
+    assert "a.py" in out
+    assert "sub/b.py" in out
+    assert "c.txt" not in out
+
+
+def test_glob_paths_skip_git(workspace: object) -> None:
+    assert isinstance(workspace, Path)
+    (workspace / ".git").mkdir()
+    _ = (workspace / ".git" / "config").write_text("x", encoding="utf-8")
+    _ = (workspace / "ok.py").write_text("x", encoding="utf-8")
+    out = call_sync(glob_paths, "**/*")
+    assert "ok.py" in out
+    assert ".git" not in out
+
+
+def test_glob_paths_max_matches(workspace: object) -> None:
+    assert isinstance(workspace, Path)
+    for i in range(5):
+        _ = (workspace / f"f{i}.txt").write_text("x", encoding="utf-8")
+    out = call_sync(glob_paths, "*.txt", max_matches=2)
+    assert "truncated" in out
+    assert out.count("\n") >= 1
+
+
+def test_glob_paths_empty_pattern(workspace: object) -> None:
+    del workspace
+    assert "error" in call_sync(glob_paths, "")