Drop the dead TENKI_PROJECT_ID env var from CI

Leftover from the project-ID removal: nothing reads TENKI_PROJECT_ID
anymore now that the live tests no longer plumb it into Valves.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: francoluxor

.github/workflows/ci.yml

@@ -60,5 +60,4 @@ jobs:
         env:
           TENKI_API_KEY: ${{ secrets.TENKI_API_KEY }}
           TENKI_API_ENDPOINT: ${{ secrets.TENKI_API_ENDPOINT }}
-          TENKI_PROJECT_ID: ${{ secrets.TENKI_PROJECT_ID }}
         run: pytest tests/integration -q