Improve calm-studio test coverage to meet threshold

[rocketstack-matt]

Feature Proposal

Target Project:

calm-suite/calm-studio

Description of Feature:

The calm-studio packages have coverage thresholds configured (90% branch coverage) but the current tests do not meet them. The @calmstudio/calm-core package has 77.58% branch coverage against a 90% threshold. This was a pre-existing gap in the source repository. The coverage enforcement has been temporarily disabled in the monorepo CI (build-calm-studio.yml uses test instead of test:coverage) to unblock integration.

User Stories:

• As a maintainer, I want CI to enforce coverage thresholds so that code quality doesn't regress over time
• As a contributor, I want clear coverage expectations so I know what standard my PRs need to meet

Current Limitations:

• pnpm --filter @calmstudio/calm-core run test:coverage fails due to branch coverage (77.58%) being below the 90% threshold
• CI currently runs test instead of test:coverage to work around this

Proposed Implementation:

1. Add tests to @calmstudio/calm-core to bring branch coverage above 90% — key gaps are in src/validation.ts (lines 217, 221-225, 230-235) and src/types.ts
2. Verify coverage thresholds pass for all packages (calm-core, extensions, mcp-server, studio)
3. Update build-calm-studio.yml to use test:coverage instead of test
4. Re-enable coverage artifact upload in CI

Alternatives Considered:

• Lower the coverage threshold — not recommended as 90% is a reasonable target for a core library
• Keep coverage enforcement disabled — delays the problem without solving it

Testing Strategy:

• Run pnpm --filter @calmstudio/calm-core run test:coverage and verify all thresholds pass
• Run full test suite across all packages

Documentation Requirements:

• None

Implementation Checklist:

• Add tests to bring @calmstudio/calm-core branch coverage above 90%
• Verify all package coverage thresholds pass
• Update build-calm-studio.yml to use test:coverage
• Re-enable coverage artifact upload in CI
• Tests written and passing

Additional Context:

This was discovered during the integration of calm-suite into the monorepo (#2320, #2329). The coverage gap is pre-existing from the source repository.

[opsflowanoop]

Gourav and I can look into this.

[gjs-opsflo]

I will add the test coverage to meet and cross the threshold.