Cookbook backlog

Recipes planned but not yet written:

• api_key_hierarchy — admin 411_ vs scoped 411k_ keys, spend caps, revoke flow
• vendor_waterfall_internals — how cache + waterfall ordering works (operator-facing)
• compliance_ack — future compliance acknowledgement flow for regulated use cases
• ~~bulk_enrichment_loop~~ — covered by batch_and_concurrency