[adrianmg]

Summary

• treat resolved GitHub mutation requests as successful, including HTTP 202 Codespace deletion
• propagate repository and Codespaces listing failures instead of deleting credentials and calling an undefined main()
• report batch outcomes consistently, continue ordinary per-item failures, and abort token-wide failures without replaying completed mutations
• invalidate stale credentials for the next invocation and return a nonzero exit status after mutation failures
• add focused regression coverage for request, propagation, continuation, and abort behavior

Validation

• npm test (40 tests)
• node --experimental-test-coverage --test

Fixes #69