[LunaUrsa]

Sonar scans ran without the LCOV report generated by Vitest, leaving coverage at 0%. Both push workflows now upload coverage from the test job, wait for that job, and download and verify the report before scanning. Restore coverage testing on main.

Align Sonar test classification and coverage exclusions with Vitest while preserving broader static analysis. Add regression tests that compare the coverage scopes across application TypeScript files.

Validation:

• Full Vitest coverage suite passed: 100% lines, statements, and functions; 97.23% branches.
• TypeScript check, targeted ESLint, workflow YAML/artifact handoff checks, and git diff --check passed.
• Regression tests and lint rechecked after moving the test into src/vitest on the fresh uat-based branch.
• Local checks used Node 24.22.0; CI uses .nvmrc. Sonar import will be confirmed after merge and the next push analysis.