Update CI actions to Node 24

Author: xeonvs

.github/workflows/ci.yml

@@ -10,8 +10,8 @@ jobs:
     env:
       PYTHONDONTWRITEBYTECODE: "1"
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@v6
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.11"
       - name: Validate skill repo

PLANS.md

@@ -6,6 +6,7 @@ Use this file for active, blocked, ready-for-closure, or recently completed exec
 
 ## Recently Completed
 
+- [x] 2026-08-13: Completed Remove CI Runtime Deprecation.
 - [x] 2026-08-13: Completed Complete Engineering Workflow 0.6.0 Publication.
 - [x] 2026-08-13: Completed Publish Engineering Workflow 0.6.0.
 - [x] 2026-08-13: Completed Engineering Workflow 0.6.0; [full archived plan](docs/archive/plans/2026-08-13-engineering-workflow-0-6-0.md).

tests/test_skill_repo_validation.py

@@ -295,6 +295,13 @@ def test_ci_revalidates_after_tests_with_bytecode_disabled(self):
         self.assertGreater(tests, first)
         self.assertGreater(second, tests)
 
+    def test_ci_actions_use_node24_majors(self):
+        workflow = (REPO_ROOT / ".github" / "workflows" / "ci.yml").read_text(encoding="utf-8")
+        self.assertIn("actions/checkout@v6", workflow)
+        self.assertIn("actions/setup-python@v6", workflow)
+        self.assertNotIn("actions/checkout@v4", workflow)
+        self.assertNotIn("actions/setup-python@v5", workflow)
+
     def test_validator_does_not_pin_long_contract_prose(self):
         source = (REPO_ROOT / "skill" / "engineering-workflow" / "scripts" / "validate_skill_repo.py").read_text(encoding="utf-8")
         legacy_name = "REQUIRED_" + "CONTRACT_SNIPPETS"