fix: install frontend deps in integration runner

Author: MRiabov

config/skills_repo.lock.json

@@ -2,6 +2,6 @@
   "branch": "main",
   "head_commit": "8d02a1c62f0fa1bf96210b2e7a3525538a109cab",
   "origin_url": "https://github.com/MRiabov/Problemologist-skills",
-  "recorded_at_utc": "2026-03-30T06:31:47Z",
+  "recorded_at_utc": "2026-03-30T06:44:21Z",
   "skills_repo_path": "skills"
 }

scripts/internal/integration_runner.py

@@ -1365,6 +1365,9 @@ def _prepare_frontend_dist(repo_root: Path, frontend_state_file: Path | None) ->
         )
         env = os.environ.copy()
         env["PYTHONPATH"] = "."
+        # CI checkouts do not have frontend node_modules populated, so install
+        # the locked frontend toolchain before generating API clients or building.
+        _run(["npm", "ci"], cwd=repo_root / "frontend")
         _run(["uv", "run", "python", "scripts/generate_openapi.py"], env=env)
         _run(["npm", "run", "gen:api"], cwd=repo_root / "frontend")
         production_env = repo_root / "frontend" / ".env.production"