feat(coverage): increase thresholds and update badges to reflect actual coverage

Updated coverage thresholds and badges to reflect the actual src/ directory
coverage now that external bundles are properly excluded.

Changes:
- Increased vitest coverage thresholds:
  - lines: 1 → 68%
  - functions: 68 → 70%
  - branches: 70% (unchanged)
  - statements: 1 → 68%

- Updated README.md badges:
  - Renamed "Test Coverage" → "Code Coverage" for clarity
  - Code Coverage: 36.76% → 68.35% (src/ directory only)
  - Type Coverage: 97.68% (unchanged)
  - Added Cumulative Coverage: 83.02% (new badge)

The thresholds now match the actual src/ directory coverage metrics,
ensuring that only source code (not external bundles) is measured
against coverage requirements.

Author: jdalton

.config/vitest.config.mts

@@ -155,10 +155,10 @@ export default defineConfig({
       skipFull: false,
       ignoreClassMethods: ['constructor'],
       thresholds: {
-        lines: 1,
-        functions: 68,
+        lines: 68,
+        functions: 70,
         branches: 70,
-        statements: 1,
+        statements: 68,
       },
     },
   },

README.md

@@ -2,8 +2,9 @@
 
 [![Socket Badge](https://socket.dev/api/badge/npm/package/@socketsecurity/lib)](https://socket.dev/npm/package/@socketsecurity/lib)
 [![CI](https://github.com/SocketDev/socket-lib/actions/workflows/ci.yml/badge.svg)](https://github.com/SocketDev/socket-lib/actions/workflows/ci.yml)
-![Test Coverage](https://img.shields.io/badge/test--coverage-36.76%25-orange)
+![Code Coverage](https://img.shields.io/badge/code--coverage-68.35%25-yellow)
 ![Type Coverage](https://img.shields.io/badge/type--coverage-97.68%25-brightgreen)
+![Cumulative Coverage](https://img.shields.io/badge/cumulative--coverage-83.02%25-brightgreen)
 
 [![Follow @SocketSecurity](https://img.shields.io/twitter/follow/SocketSecurity?style=social)](https://twitter.com/SocketSecurity)