Add: Sprint 3 (Payments) and Sprint 4 (Data Wallets)

Sprint 3: Digital Payments Integration
- Hyperledger Fabric integration (Apache 2.0, Linux Foundation)
- Cryptocurrency payments (Bitcoin, Ethereum, stablecoins)
- Fiat payments (Stripe, PayPal)
- Payment records as MEAL packets (immutable, cryptographically verified)
- Automatic MEAL entry creation on payment
- Payment querying via PANCAKE's AI

Sprint 4: Data Wallets & Chain of Custody
- Hyperledger Indy/Aries integration (Apache 2.0, Linux Foundation)
- Verifiable credentials (W3C VC standard)
- Data wallet structure with selective disclosure
- Chain of custody MEAL packets
- Authorized access control + smart contract-based unlock
- EUDR compliance (Priority 1)
- Food safety traceability (Priority 2)
- Integration with Sprint 1 OECD identity work

Testing Profiles:
- testing_EUDR.md: EUDR compliance testing scenarios
- testing_food_safety.md: Food safety traceability testing scenarios

Key Features:
- All payments and custody transfers stored as MEAL packets
- Leverages Linux Foundation permissively licensed projects
- Simple, mature, usable without compromising integrity
- Separate systems (payments and data wallets) that can work independently

Timeline: 12 weeks each (3 phases, 4 weeks each)
Status: Planning
Priority: High

Author: sumerjohal