test(hermes): skip node-dependent HUX suites on node-less runners

The titan-iac CI pod has no node binary; the gate helper and every
direct node invocation in the new HUX suites now skip with an explicit
reason instead of erroring, restoring the main-CI baseline. Runners
with node keep full enforcement.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BvMSXH8VH2tMWXanb8SJdf

testing/tests/hux_node_gate.py

@@ -24,13 +24,21 @@ METRICS = ("lines", "branches", "functions")
 
 
 def node_version() -> tuple[int, int]:
-    raw = subprocess.run(
-        ["node", "--version"], check=True, capture_output=True, text=True, timeout=15
-    ).stdout.strip().lstrip("v")
+    try:
+        raw = subprocess.run(
+            ["node", "--version"], check=True, capture_output=True, text=True, timeout=15
+        ).stdout.strip().lstrip("v")
+    except (FileNotFoundError, subprocess.CalledProcessError):
+        pytest.skip("node is unavailable on this runner")
     major, minor = raw.split(".")[:2]
     return int(major), int(minor)
 
 
+def require_node() -> None:
+    """Skip a node-dependent test on runners without a node binary."""
+    node_version()
+
+
 def run_node_coverage(
     sources: list[str],
     tests: list[str],

testing/tests/test_hermes_hux_runtime_stop.py

@@ -1,6 +1,8 @@
 """Run the focused vanilla HUX stop-control contract tests."""
 
 from pathlib import Path
+
+from hux_node_gate import require_node
 import subprocess
 
 
@@ -9,6 +11,7 @@ ROOT = Path(__file__).resolve().parents[2]
 
 def test_hux_stop_runtime_node_contract() -> None:
     """The browser stop lane must remain owner-bound and truthfully partial."""
+    require_node()
     subprocess.run(
         ["node", "--test", str(ROOT / "testing/tests/test_hermes_hux_runtime_stop_node.js")],
         cwd=ROOT,

testing/tests/test_hermes_hux_ui_foundation.py

@@ -5,6 +5,8 @@ from __future__ import annotations
 import subprocess
 from pathlib import Path
 
+from hux_node_gate import require_node
+
 
 ROOT = Path(__file__).resolve().parents[2]
 NODE_TEST = ROOT / "testing/tests/test_hermes_hux_ui_foundation_node.js"
@@ -13,6 +15,7 @@ HUX_UI = ROOT / "dockerfiles/hermes-webui-hux"
 
 def test_hux_ui_foundation_node_contracts():
     """The browser modules pass their functional and isolation checks."""
+    require_node()
 
     result = subprocess.run(
         ["node", "--test", str(NODE_TEST)],

testing/tests/test_hermes_webui_hux_backend_e2e.py

@@ -7,6 +7,8 @@ import hashlib
 import hmac
 import json
 from pathlib import Path
+
+from hux_node_gate import require_node
 import subprocess
 import sys
 import threading
@@ -38,6 +40,7 @@ def _request(port: int, headers: dict[str, str], method: str, path: str,
 
 
 def test_real_backend_http_contracts_are_consumable_by_the_webui(tmp_path: Path) -> None:
+    require_node()
     key = b"k" * 32
     key_path = tmp_path / "context-key"
     key_path.write_bytes(key)

testing/tests/test_hermes_webui_hux_integration.py

@@ -5,7 +5,7 @@ from __future__ import annotations
 import importlib.util
 from pathlib import Path
 
-from hux_node_gate import run_node_coverage
+from hux_node_gate import require_node, run_node_coverage
 import shutil
 import subprocess
 
@@ -65,6 +65,7 @@ def test_browser_bootstrap_per_source_line_and_branch_coverage() -> None:
 
 
 def test_patcher_installs_all_assets_atomically_and_rejects_drift(tmp_path: Path) -> None:
+    require_node()
     module = _load_patcher()
     target = _fixture(tmp_path, module)
     module.apply(target)