[codex] Add scoped coverage reporting (#1024)

* add scoped coverage reporting

* fix coverage review feedback

---------

Co-authored-by: 4gray <fourgray@proton.me>

jest.preset.js

@@ -1,3 +1,19 @@
 const nxPreset = require('@nx/jest/preset').default;
 
-module.exports = { ...nxPreset };
+const coverageReporters = ['json', 'json-summary', 'lcovonly', 'text-summary'];
+
+const collectCoverageFrom = [
+    'src/**/*.{ts,js,mjs,html}',
+    '!src/**/*.{spec,test}.ts',
+    '!src/**/test-setup.ts',
+    '!src/**/test-stubs/**',
+    '!src/**/*.generated.*',
+    '!src/**/environments/**',
+    '!src/**/index.ts',
+];
+
+module.exports = {
+    ...nxPreset,
+    coverageReporters,
+    collectCoverageFrom,
+};