Update all classic CI workflows to use the single consolidated
pyproject.toml at classic/ instead of individual project directories.
Changes:
- classic-autogpt-ci.yml: Run from classic/, update cache key and test paths
- classic-forge-ci.yml: Run from classic/, update cache key and test paths
- classic-benchmark-ci.yml: Run from classic/, use direct-benchmark command
- classic-python-checks.yml: Simplify to single job (no matrix needed)
- classic-autogpts-ci.yml: Update to use direct-benchmark for smoke tests
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>