MCP: add real end-to-end smoke tests for tools #5
Description
Summary
The MCP tool surface needs end-to-end smoke tests against the OmniClaw SDK.
Problem
The MCP layer exposes critical payment operations:
- simulate
- pay
- create_payment_intent
- confirm_payment_intent
- cancel_payment_intent
Without end-to-end smoke coverage, the MCP contract can drift from the SDK or break at runtime.
What needs to happen
Add integration tests that exercise MCP tools against real SDK flows or realistic test doubles.
Acceptance criteria
- smoke tests cover simulate
- smoke tests cover pay
- smoke tests cover payment intent lifecycle
- tool failures map to structured MCP errors
- tests are runnable locally and in CI or opt-in integration mode