audit-backend-architecture — Distributed-Systems Pattern Maturity Audit

Degree of freedom: MIXED — Fit, presence, and adopt/defer [HIGH freedom]; Phase 0 topology probes [LOW freedom — run exactly]. Never mark a pattern Missing if its tier is N/A.

Read-only. Assess and recommend; do not change code. Per-call timeouts, retry+jitter, idempotency keys, cancellation → audit-resilience. This skill checks whether the patterns exist and whether they fit.

Two lenses:

1. Conformance (Phase 2) — Implemented / Partial / Missing / N/A with file:line.
2. Fit / decision (Phase 3) — Adopt now / Adopt when [trigger] / Defer (premature). "Don't build this yet" is a first-class finding.

Core principle — start simple, earn every pattern