peptiderepo c8236189cd test(images): cover retry loop and validator edge cases ...

Addresses P1 feedback from QA verdict on 11108b3:
- Retry-path tests: 429-then-200, 500-then-200, persistent-502 exhausts
  all attempts and throws.
- Validator guardrail test: validate_credentials_detailed() asserts
  wp_remote_post is never called, locking in the non-destructive probe
  contract so no "Test Connection" click ever burns image-gen budget.
- Validator edge case: missing account_id returns 'account_id_empty'
  without touching the network.
- Bootstrap retry delay set to 0 in tests so the new retry-loop tests
  don't spend real wall time in sleep(). Production value unchanged
  (PRAUTOBLOGGER_RETRY_BASE_DELAY_SECONDS = 2 in prautoblogger.php).

Risk flags:
- No code under test changed. Same provider diff as 11108b3; this
  commit is purely additional coverage + a zero-impact bootstrap tweak.

Agent-Session: cowork-2026-04-15-image-pipeline-commit-1a-qa-fixup

2026-04-15 10:14:38 +07:00

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