Add fresh full-graph uv resolution test to install CI

uv lock --upgrade --dry-run re-resolves every dependency, extra, and
platform fork from the live public indexes without writing or
installing anything - what uv run does on a bare machine. This is the
check that catches an internal-only pin (like the previous
ovphysx==0.5.2+head build) or an unsatisfiable marker split.

Verified both ways: passes on this branch, fails on current develop
with the ovphysx pin error this PR fixes.

Author: myurasov-nv

source/isaaclab/test/install_ci/misc/test_uv_fresh_resolution_smoke.py

@@ -0,0 +1,54 @@
+# Copyright (c) 2022-2026, The Isaac Lab Project Developers (https://github.com/isaac-sim/IsaacLab/blob/main/CONTRIBUTORS.md).
+# All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+
+"""
+Setup:
+    - (none: the test resolves dependencies only and does not install anything)
+Tests:
+    - uv lock --upgrade --dry-run -> verify the full dependency graph (all extras, all
+      platforms) re-resolves from the live public indexes, i.e. ``uv run`` works from
+      a bare machine
+"""
+
+from __future__ import annotations
+
+import shutil
+
+import pytest
+from utils import run_cmd
+
+
+@pytest.mark.uv
+@pytest.mark.smoke
+class Test_Uv_Fresh_Resolution_Smoke:
+    """A fresh, full-graph resolution must succeed from the public indexes.
+
+    ``uv lock --upgrade --dry-run`` re-resolves every dependency, extra, and platform
+    fork from scratch without writing the lockfile or installing anything - exactly
+    what ``uv run`` does on a bare machine before the first lock exists. This is the
+    check that catches a pin that only resolves against internal infrastructure
+    (e.g. an unpublished ``ovphysx==0.5.2+head...`` build) or a marker split uv
+    cannot satisfy.
+
+    Complements the neighbouring checks: ``test_uv_lock_check_smoke`` validates the
+    committed lock is current, the ``uv_run/`` tests validate the committed lock
+    installs and trains, and ``test_uv_universal_resolution_smoke`` covers the base
+    dependencies only (no extras).
+    """
+
+    @classmethod
+    def setup_class(cls):
+        if not shutil.which("uv"):
+            pytest.skip("uv is not available")
+
+    @pytest.mark.timeout(900)
+    def test_uv_lock_upgrade_resolves_all_extras_from_public_indexes(self, isaaclab_root):
+        """Verify ``uv lock --upgrade --dry-run`` resolves the full graph fresh."""
+        result = run_cmd(["uv", "lock", "--upgrade", "--dry-run"], cwd=isaaclab_root, timeout=880)
+        assert result.returncode == 0, (
+            "Fresh full-graph resolution failed, so `uv run` is broken on a bare machine."
+            " A dependency (often in an optional extra) no longer resolves from the public"
+            f" indexes, or a marker split is unsatisfiable:\n{result.stdout}\n{result.stderr}"
+        )