[quality-keeper] B2 standards failure

[sophiecarreras]

Summary

This repo fails one or more mandatory B2 standards checked by `/b2-doctor`.

The three standards are:

1. S3-compatible API used as the default (not the native B2 API)
2. Custom user-agent set on every S3 client
3. Standardized `B2_*` env var names: `B2_APPLICATION_KEY_ID`, `B2_APPLICATION_KEY`, `B2_BUCKET_NAME`, `B2_REGION`, `B2_PUBLIC_URL_BASE`

Evidence

Run `/b2-doctor ` for the exact per-repo failure reason.

Why it matters

These standards ensure consistent, auditable B2 usage across all sample repos.

Suggested fix

Run `/b2-doctor` to identify the exact failure, then fix to match the standard.

Acceptance criteria

• `B2_DOCTOR: PASS` in the next quality-keeper run

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Filed by quality-keeper (2026-06-19). Migrated from backblaze-labs/demand-side-ai#371.