* weed-db: end startup when password authentication fails
The failure branches returned the result of writing the error response,
which is nil on success, so the handshake carried on to ReadyForQuery.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
* weed-db: test startup with wrong and unknown credentials
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
* weed-db: check the auth error code and fail on stray read errors in the startup test
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
