feat: backport auth-validation preflight + email_login credentials #6

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Author SHA1 Message Date
Chris Farhood 47a6e4933a feat: backport auth-validation preflight + email_login credentials
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Backport upstream Shannon PR #335:
- Add credential validation activity that drives a real browser login
  before the full pipeline, catching bad credentials early
- New email_login credentials type for magic-link and email-OTP flows
- Make credentials.password optional for passwordless flows
- Playwright stealth config (chrome.runtime, plugin simulation, UA)
- Centralize prompt directory resolution into resolvePromptDir helper
- New AUTH_LOGIN_FAILED error code with non-retryable classification
- Remove dangerous-pattern validation on credentials.password
- Pipeline-testing stub for auth validation (returns success)
- Auth validation timeout of 10 minutes for browser-based login
- .playwright directory workspace overlay for CLI/Docker

Co-Authored-By: Paperclip <noreply@paperclip.ing>
2026-05-20 00:59:27 +00:00