Add alpha-hardening ADRs and issue plan from pre-release audit.

Lock alpha scope, tracker auth, TOPLOC fraud verification, and deferred multi-tracker money-path work; supersede legacy fraud issues with ADR-0018.

Co-authored-by: Cursor <cursoragent@cursor.com>

.scratch/alpha-hardening/issues/16-doc-us006-reconciliation.md

@@ -0,0 +1,30 @@
+Status: ready-for-agent
+
+# 16 — DOC: US-006 reconciliation note
+
+## What to build
+
+Reconcile stale US-006 (Solana testnet stake contracts) with ADR-0015/0016 devnet custodial settlement. Issue `docs/issues/06-solana-stake-and-settlement.md` says "never devnet"; ADR-0015 explicitly targets devnet mock-USDT.
+
+Also reconcile legacy fraud issues with the alpha-hardening fraud arc:
+
+- `docs/issues/07-fraud-detection-slash.md` — on-chain stake slash model superseded by pending-balance forfeiture + TOPLOC (ADR-0018)
+- `docs/issues/34-forfeiture-penalty.md` — partially implemented; remaining fraud work lives in `.scratch/alpha-hardening/issues/06-fraud-toploc-integration.md` through `10-fraud-penalty-calibration-wiring.md`
+
+## Acceptance criteria
+
+- [ ] Add reconciliation comment atop `docs/issues/06-solana-stake-and-settlement.md` (Status: superseded for alpha — see ADR-0015, issue 33/34)
+- [ ] Add **superseded** banner atop `docs/issues/07-fraud-detection-slash.md` → ADR-0018 + issues 06–10
+- [ ] Add **superseded for remaining scope** banner atop `docs/issues/34-forfeiture-penalty.md` → ADR-0018 + issues 06–10 (note done items: basic forfeiture wired)
+- [ ] Update `docs/prd.json` US-006 description footnote if present
+- [ ] Cross-link ADR-0015 devnet decision
+- [ ] No production code changes
+
+## ADR links
+
+- [ADR-0015](../../docs/adr/0015-usdt-custodial-settlement.md)
+- [ADR-0016](../../docs/adr/0016-alpha-scope-and-known-limitations.md)
+
+## Blocked by
+
+None