Stellar contract integration test suite against live futurenet

[truthixify]

Tier: L (1-2 weeks) Type: test

Context

Unit tests in Soroban testutils cover most cases but real Soroban host behavior on futurenet can differ (fees, ledger semantics, RPC quirks). Need a real-network integration test layer.

Scope

• New stellar/integration-tests/ directory
• Tests deploy each contract to futurenet, exercise core flows, assert on-chain state
• Fund test accounts via friendbot in beforeAll
• CI smoke job (allow-flaky, weekly)
• Coverage: register → send → scan → withdraw → name register/resolve/release

Acceptance criteria

• Integration test harness with at least 8 scenarios
• CI weekly job
• Flake-handling documented
• Test results published to a status page

Files to start with

• New: stellar/integration-tests/
• stellar/deploy.sh (for fresh deploys per test run)