feat: SolaceNet gateway rails, IRU marketplace hardening, and docs

- Gateway adapter registry, rails routes, optional SOLACENET_GATEWAY_RAILS_ENFORCE; HTTP integration tests.
- IRU marketplace: rate limits, public routes, notifications/SMTP env docs; marketplace UI constants and flows.
- Quantum proxy legacy protocol types; debank/tezos/GSDS touch-ups; .env.example operator notes.
- SolaceNet doc set (gaps, runbooks, telecom schema example).

Tests: npm run test:iru-marketplace, npm run test:gateway (pass).
Note: full-repo tsc still reports unrelated legacy errors outside this change set.
Made-with: Cursor

SOLACENET_IMPLEMENTATION_STATUS.md

@@ -66,6 +66,8 @@ This document tracks the implementation status of the SolaceNet Capability Platf
   - Request routing
   - Authentication/authorization
 - **Note**: Requires Go 1.21+ and Redis
+- **Rail / protocol governance**: External messaging rails and adapter contracts (SWIFT, DTC/DTCC, TT, KTT legacy evidence, and northbound contracts from telecom boundaries) are **maintained under SolaceNet**. See `docs/solacenet/RAIL_AND_PROTOCOL_GOVERNANCE.md` and TypeScript adapters under `src/core/gateway/adapters/`.
+- **Gateway REST (rails registry)**: `GET /api/v1/gateway/rails`, `GET/POST .../rails/:adapterId/health|validate|receive`, plus optional `SOLACENET_GATEWAY_RAILS_ENFORCE` on gateway routes — `src/core/gateway/routes/gateway.routes.ts`, `src/core/gateway/rails/gateway-rails-enforcement.ts`.
 
 ### ✅ Service SDK
 - **Status**: Complete
@@ -273,6 +275,10 @@ To test the implementation:
 3. Start the server: `npm run dev`
 4. Test API endpoints using the Swagger UI: `http://localhost:3000/api-docs`
 
+## Protocol gaps (rails and external messaging)
+
+Tracked checklist with gap IDs, RTGS matrix cross-reference, and suggested close order: `docs/solacenet/PROTOCOL_GAPS_CHECKLIST.md`. Governance: `docs/solacenet/RAIL_AND_PROTOCOL_GOVERNANCE.md`.
+
 ## Notes
 
 - The Go gateway requires Go 1.21+ and Redis