Create E2E testing framework for testnet validation

[umwelt]

Context

Need comprehensive E2E tests to validate testnet functionality before user recruitment. This supports the Phase 1 deliverable: "Recruit early users and node operators" by ensuring system stability.

Scope

• E2E test for full identity lifecycle (create, login, backup, recover)
• E2E test for wallet operations (create, transfer, stake)
• E2E test for guardian recovery flow
• E2E test for DHT storage/retrieval
• E2E test for smart contract interactions
• Automated test runner for CI/CD

Dependencies

• All Phase 1 features must be implemented

Acceptance Criteria

• Identity lifecycle test covers all operations
• Wallet operations test includes edge cases
• Guardian recovery test validates full flow
• DHT test validates replication and retrieval
• Smart contract tests validate all contracts
• Tests run in CI/CD pipeline
• Test reports generated automatically
• >90% success rate on testnet

Technical Notes

• Use existing test framework from zhtp
• Tests should run against live testnet
• Include performance benchmarks
• Generate test reports in JUnit format
• Existing identity tests: zhtp/zhtp/tests/identity_recovery_tests.rs
• Core features to test: Username/password auth, quantum-safe wallets (Primary/UBI/Savings), DHT storage, email/device verification