v3.21.0 — Real-World Applicability VII (Developer-Experience Audit) Seventh real-world milestone, discovery-first DX audit (phases 208-211). Honest near-empty grounding: 11 findings, 0 High/Critical, 2/11 po-actionable. Shipped: opt-in SQLLogger decorator (ADR-0020, --sql-logger=slog, logs SQL text only never args, stdlib slog, 0 net-new deps) + README SQL-visibility doc. Additive/opt-in; existing schemas regenerate byte-identically. Gates: check + check-integration + vuln + rc-acceptance step-8 (byte-equal) green; cover 90.7%; ratchet 135/62/22/41/5 held; code-review CLEAN.