Port 27 additional integration tests to Go testscript framework
New tests cover:
- Config discovery from subdirectories
- cog run command (basic, fast build, stdin handling)
- Build labels (OpenAPI schema, pip freeze, model dependencies, GPU)
- Build options (image naming, base image SHA, cog init, localimage)
- Predict flags (-o output, --json, --x-pipeline, --x-localimage)
- Predict with pre-built images and many input types
- cog debug with secrets
4 tests marked [slow] for GPU/monobase builds that require specific
architecture or long build times.
Tests ported from Python:
- test_config.py: 1 test
- test_run.py: 5 tests
- test_build.py: 12 tests
- test_predict.py: 9 tests
Total Go integration tests: 87 (60 existing + 27 new)
