Add devnet test harness with Leo devnode and GitHub Actions CI

[marshacb]

Summary

Local devnet integration test harness using @veil/devnode with snapshot support. 17 tests validate Veil's full API surface against a real devnode with instant block finality.

Changes since initial PR

• Refactored from inline process management to @veil/devnode (startDevnode/stop)
• Added snapshot support: first run deploys programs and takes a snapshot, subsequent runs restore from it
• CI updated to install the public aleo-devnode binary (no auth needed)
• Updated for executeContract / executeTransaction naming split from Align executeContract behavior across account types #55
• Expanded from 9 to 17 integration tests

Test coverage

Category	Tests
Core lifecycle	Connectivity, simulate, execute with transitions, deploy
ABI pipeline	getCode → parseProgram, codegen simulate via getContract
Simulate vs execute	Output count consistency across both paths
Cross-program (#13)	Per-transition outputs from loyalty_rewards → loyalty_token
Record round trip (#18)	Mint card → use as input to add_points → verify updated output
Mapping round trip	Execute writes to mapping → read back via publicClient
getContract proxy	Execute returns parsed transitions with program/function metadata
Error classifiers	InvalidTransaction, DuplicateTransaction, RecordSpent, FinalizeRevert
Config validation	ConfigurationError for missing proverUrl

Running locally

# Requires aleo-devnode on PATH
RUN_DEVNET=true pnpm vitest run packages/provable/test/devnet.test.ts

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Project	Deployment	Actions	Updated (UTC)
veil-loyalty-dapp	Error		May 15, 2026 8:48pm