fix: set smoke status path in a step, not job env

GitHub rejects runner.temp at job-level env, so the workflow never
parsed and the PR never got a smoke job.

Signed-off-by: fOuttaMyPaint <TMhospitalitystrategies@gmail.com>
Co-authored-by: Cursor <cursoragent@cursor.com>

Author: TMHSDigital

.github/workflows/blender-smoke.yml

@@ -29,8 +29,6 @@ jobs:
     name: Blender ${{ matrix.series }} smoke
     runs-on: ubuntu-latest
     timeout-minutes: 45
-    env:
-      BDT_SMOKE_STATUS: ${{ runner.temp }}/smoke-status.jsonl
     strategy:
       fail-fast: false
       matrix:
@@ -43,6 +41,13 @@ jobs:
           set -euo pipefail
           python3 tests/smoke/test_harness.py -v
 
+      - name: Init smoke status log
+        run: |
+          set -euo pipefail
+          # runner.temp is illegal in job-level env; set it from the step shell.
+          echo "BDT_SMOKE_STATUS=$RUNNER_TEMP/smoke-status.jsonl" >> "$GITHUB_ENV"
+          : > "$RUNNER_TEMP/smoke-status.jsonl"
+
       - name: Install Blender runtime libraries
         run: |
           set -euo pipefail