fix(ci): address PR review feedback for benchmark smoke tests

Security:
- Remove "Login to Hugging Face" step — it was a no-op (ephemeral
  --rm container) that exposed the HF token via CLI argument in
  docker inspect / /proc/*/cmdline. The eval step already
  re-authenticates via env var.

Functional:
- Remove feat/benchmark-ci from push trigger branches (won't exist
  post-merge).

Dockerfiles:
- Pin uv to 0.8.0 (was unpinned, fetching whatever latest ships).
- Add comment explaining the chmod +x ptxas workaround (Triton
  packaging bug — ships ptxas without execute bit).

Scripts:
- parse_eval_metrics.py: add note that it runs on bare host and must
  stay stdlib-only.
- parse_eval_metrics.py: add NaN guard for avg_sum_reward and eval_s
  (was only guarding pc_success).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/workflows/benchmark_tests.yml

@@ -31,7 +31,6 @@ on:
 
   push:
     branches:
-      - feat/benchmark-ci
       - main
     paths:
       - "src/lerobot/envs/**"
@@ -101,14 +100,6 @@ jobs:
           load: true
           tags: lerobot-benchmark-libero:ci
 
-      - name: Login to Hugging Face
-        if: env.HF_USER_TOKEN != ''
-        run: |
-          docker run --rm \
-            -e HF_HOME=/tmp/hf \
-            lerobot-benchmark-libero:ci \
-            bash -c "hf auth login --token '$HF_USER_TOKEN' --add-to-git-credential && hf auth whoami"
-
       - name: Run Libero smoke eval (1 episode)
         run: |
           # Named container (no --rm) so we can docker cp artifacts out.