chore: enable jest test coverage reporting

[rockaxorb13]

Description

This PR updates the package.json configuration to automatically generate and display a Code Coverage Summary whenever npm test is run. This aligns the developer experience with other Accord Project repositories (like concerto) and helps identify untested areas of the codebase.

Changes

• Updated package.json scripts: Added --coverage --coverageReporters=text-summary to the test command.
• Configured Jest: Added coveragePathIgnorePatterns to exclude node_modules, test/, and auto-generated model-gen files from the coverage calculation to ensure the metrics reflect actual source code quality.

Fixes

Fixes #1

Sample Output

=============================== Coverage summary ===============================
Statements   : 49.59% ( 800/1613 )
Branches     : 23.91% ( 188/786 )
Functions    : 31.25% ( 80/256 )
Lines        : 49.27% ( 782/1587 )
================================================================================

Test Suites: 1 failed, 9 passed, 10 total
Tests:       1 failed, 49 passed, 50 total
Snapshots:   32 passed, 32 total
Time:        53.737 s
Ran all test suites.

Note on CI status

I observed that the current main branch has regression failures (specifically ValidationException: ... field "nodes" has a value of "undefined"). Those failures are unrelated to this configuration change, and I plan to address them in a separate PR.