The Hardening Checklist

The decision it resolves: what turns a working demo into a system that survives production?

Stub: planned for a later release.

The cross-reference hub for the "just engineering" concerns that every pattern leans on but none owns: retry and graceful degradation, the enforced observer rule, checkpointing and resumption, observability and tracing, token and cost economics, and concurrency locks. Each gets a short entry and a link to the chapter that argues it in full, so a pattern chapter can point here instead of re-teaching the same rails. Draws from Reliability and Operating in Production.