fiber-py-integration-test

Write, review, and debug integration tests for the Fiber Network (CKB Lightning Network) project. Use when creating new test cases, understanding test patterns, doing test gap analysis, working with Fiber RPC APIs, testing channel operations, payment flows, invoice management, watchtower, or any testing task related to the fiber-py-integration-test project. Also use when the user asks about Fiber architecture, Bitcoin Lightning Network comparison, test coverage gaps, or needs to write regression tests for new PRs.