audit: 2026-05-30 full-codebase audit — report, issues, docs, runbooks

Full-codebase-audit 2026-05-30 outputs:
- Audit report: 09 - Audits/Full Codebase Audit - 2026-05-30.md
- 81 issue files ISSUE-055..135 (decisions + 1 skipped no-brainer).
- Scanner docs from scratch (was zero): architecture, data model, API ref, payment
  flow, operations runbook + repo README.
- Doc-sync updates across API reference, data models, flows, design system.
- Secret Rotation Runbook (08 - Operations) for the exposed credentials.
- Reusable workflow guide (07 - Development) + .claude/workflows/full-codebase-audit.js.

Issues remain status:open intentionally — the code fixes are uncommitted-then-committed
working-tree changes per repo and aren't "resolved" until merged/deployed.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

02 - Data Models/Data Model Overview.md

@@ -38,6 +38,7 @@ This section documents every Mongoose model that backs the marketplace. The pers
 - [[DerivedDestination]] — Per-payment derived wallet destination records used to reduce address reuse and reconcile on-chain pay-ins.
 - [[FundsLedgerEntry]] — Immutable accounting ledger rows for pay-in, hold, release, refund, fee, adjustment, and reversal events.
 - [[TrezorAccount]] — Hardware-wallet/safekeeping account metadata for custody operations and staged signer hardening.
+- [[ConfigSettingHistory]] — Immutable audit trail of numeric runtime-config changes. Currently used for per-chain confirmation threshold change events, keyed as `confirmation_threshold:<chainId>`. Added in commit `27fb15a`.
 
 ## Relationship Diagram