Add focused unit tests for JSON object validation, key=value decoding, and override merge behavior so the new wrapper has offline regression coverage.
Constraint: PR #229 introduces a public MCP wrapper whose live endpoint should not be required for CI coverage.
Rejected: Live MCP smoke as the only validation | upstream availability would make the regression path flaky.
Confidence: high
Scope-risk: narrow
Directive: Keep wrapper argument parsing covered without requiring network or mcp package installation.
Tested: python3 -m unittest scripts.test_myrealtrip_mcp; node --test scripts/skill-docs.test.js; ./scripts/validate-skills.sh
Not-tested: Live MyRealTrip MCP endpoint call.
