Add Cross-Contract Integration Functions

[ONEONUORA]

Component: Contracts (All) | Effort: 5-7 days | Priority: HIGH

Current State

Contracts exist independently. No cross-contract integration functions.

Missing Functions

Cross-contract integration:

• InheritanceContract::get_lending_contract() - Get lending contract address
• InheritanceContract::set_lending_contract() - Set lending contract (admin)
• InheritanceContract::get_governance_contract() - Get governance contract
• LendingContract::get_inheritance_contract() - Get inheritance contract
• LendingContract::verify_plan_ownership() - Verify caller owns plan
• GovernanceContract::get_controlled_contracts() - List contracts under governance
• GovernanceContract::execute_on_contract() - Execute governance decision on contract

Why This Matters

• Integration: Contracts need to communicate
• Security: Verify cross-contract calls
• Governance: Governance contract controls other contracts
• Functionality: Lending needs to verify plan ownership

Tasks

• Add contract address storage in each contract
• Implement set_lending_contract() in InheritanceContract
• Implement set_inheritance_contract() in LendingContract
• Add set_governance_contract() in all contracts
• Implement cross-contract verification functions
• Add verify_plan_ownership() in LendingContract
• Implement execute_on_contract() in GovernanceContract
• Add contract registry pattern
• Implement contract upgrade coordination
• Add ContractLinked events
• Add tests for cross-contract calls
• Document integration architecture

Acceptance Criteria

• Contracts can reference each other
• Cross-contract calls work securely
• Governance can control other contracts
• Ownership verification works
• Tests cover integration scenarios
• Documentation explains architecture