fix(state): tolerate Windows resource stubs

hermes_state_readpool.py

@@ -101,7 +101,7 @@ def _fd_soft_limit() -> Optional[int]:
         return None
     try:
         soft, _hard = resource.getrlimit(resource.RLIMIT_NOFILE)
-    except (OSError, ValueError):
+    except (AttributeError, OSError, ValueError):
         return None
     if soft in (resource.RLIM_INFINITY, -1):
         return None

tests/hermes_cli/test_resource_limits.py

@@ -100,6 +100,13 @@ def test_unsupported_platform_is_a_safe_noop(monkeypatch):
     assert resource_limits.apply_nofile_soft_limit({}) is False
 
 
+def test_windows_resource_stub_without_rlimit_attributes_is_a_safe_noop(monkeypatch):
+    """Windows can import ``resource`` even when its POSIX API is absent."""
+    monkeypatch.setattr(resource_limits, "_resource", object())
+
+    assert resource_limits.apply_nofile_soft_limit({}) is False
+
+
 def test_fresh_process_import_without_posix_resource_is_a_safe_noop():
     code = textwrap.dedent(
         """

tests/hermes_state/test_session_db_read_conn_pool.py

@@ -627,6 +627,16 @@ def test_fd_headroom_guard_fails_open_where_it_cannot_measure(monkeypatch):
     assert readpool._fd_headroom_ok() is False
 
 
+def test_fd_soft_limit_ignores_windows_resource_stub(monkeypatch):
+    """A Windows resource stub has no POSIX RLIMIT attributes."""
+    import sys
+    from types import SimpleNamespace
+
+    monkeypatch.setitem(sys.modules, "resource", SimpleNamespace())
+
+    assert hermes_state_readpool._fd_soft_limit() is None
+
+
 @pytest.mark.requires_wal
 def test_duplicate_handles_on_one_path_are_reported(db, caplog):
     """Writer connections cannot be capped, so duplicates must be visible."""