Bugfix: fix macOS tmp path handling in artifact store

- compare resolved tmp root paths on both sides for /tmp symlink parity
- ensure shared-permission logic runs on macOS (/tmp -> /private/tmp)
- restore failing tmp permission tests for shared-root scenarios - 2026-02-28 12:24:55

Author: mgarcia01752

src/pypnm/pnm/lib/pnm_artifact_store.py

@@ -126,7 +126,7 @@ def _ensure_tmp_pypnm_permissions(self) -> None:
         """Ensure /tmp/pypnm uses shared-group permissions when configured as cache root."""
         expected = Path("/tmp/pypnm")
         try:
-            if self._tmp_root.resolve() != expected:
+            if self._tmp_root.resolve() != expected.resolve():
                 return
         except OSError:
             if self._tmp_root != expected: