Initial project setup: Add contracts, API definitions, tests, and documentation

- Add Foundry project configuration (foundry.toml, foundry.lock)
- Add Solidity contracts (TokenFactory138, BridgeVault138, ComplianceRegistry, etc.)
- Add API definitions (OpenAPI, GraphQL, gRPC, AsyncAPI)
- Add comprehensive test suite (unit, integration, fuzz, invariants)
- Add API services (REST, GraphQL, orchestrator, packet service)
- Add documentation (ISO20022 mapping, runbooks, adapter guides)
- Add development tools (RBC tool, Swagger UI, mock server)
- Update OpenZeppelin submodules to v5.0.0

tools/rbc/IMPLEMENTATION.md

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+# RailBridge Composer Implementation Summary
+
+## Completed Components
+
+### Smart Contracts
+- ✅ `PacketRegistry.sol` - On-chain packet lifecycle registry
+- ✅ `IPacketRegistry.sol` - Interface for packet registry
+
+### Core Modules
+- ✅ Instruction types and data models
+- ✅ Composer engine (orchestrates PDF generation, signing, packaging)
+- ✅ Instruction validator
+- ✅ Sidecar file generator (JSON, XML, hashes)
+
+### PDF Generation
+- ✅ PDF generator using PDFKit
+- ✅ PDF layout utilities (cover page, MT103 fields, signatures, appendix)
+- ✅ QR code generation for verification
+- ✅ PDF signing module (PAdES support)
+
+### Templates
+- ✅ Template engine (Handlebars)
+- ✅ MT103-equivalent credit transfer template
+- ✅ Recall/cancellation template
+- ✅ Return/reject template
+- ✅ Settlement confirmation template
+
+### Crypto & Security
+- ✅ Hashing (SHA-256, SHA3-256)
+- ✅ PGP encryption
+- ✅ S/MIME encryption
+
+### Transport Modules
+- ✅ Secure email transport (PGP + S/MIME)
+- ✅ AS4 envelope builder
+- ✅ Portal upload handler
+
+### Chain Integration
+- ✅ ChainID 138 connector
+- ✅ Trigger registry client
+- ✅ Packet registry client
+
+### Storage
+- ✅ Counterparty profile store
+- ✅ Key/certificate management
+
+### Interfaces
+- ✅ CLI interface (compose, send, verify, profile management)
+- ✅ REST API service (Express)
+
+## Configuration
+
+Configuration is managed via `config/default.json` and environment variables:
+- `RPC_URL` - ChainID 138 RPC endpoint
+- `PRIVATE_KEY` - Private key for signing transactions
+- `PACKET_REGISTRY` - PacketRegistry contract address
+- `TRIGGER_REGISTRY` - RailTriggerRegistry contract address
+
+## Usage
+
+### CLI
+```bash
+# Compose packet from trigger
+rbc compose <triggerId>
+
+# Send packet
+rbc send <instructionId> --mode email --profile <profileId>
+
+# Verify packet
+rbc verify <instructionId>
+
+# List profiles
+rbc profile list
+```
+
+### API
+```bash
+# Start API server
+npm run start:api
+
+# Compose packet
+POST /api/v1/compose
+{
+  "triggerId": 12345
+}
+
+# Send packet
+POST /api/v1/send
+{
+  "instructionId": "ABC-2025-000001",
+  "mode": "email",
+  "profileId": "counterparty1"
+}
+```
+
+## Next Steps
+
+1. Deploy `PacketRegistry` contract to ChainID 138
+2. Configure contract addresses in `config/default.json`
+3. Set up counterparty profiles
+4. Test end-to-end flow
+5. Add production email/AS4 integrations (currently placeholders)
+
+## Notes
+
+- Some transport modules contain placeholder implementations that need production integration
+- PDF signing uses simplified PAdES (full implementation may require additional libraries)
+- AS4 XML signing is simplified (full XMLDSig implementation needed for production)
+