fix(ci): resolve jest coverage command error

- Replace npx jest with npm run test:ci in CI coverage job
- Update test:ci script to match original command pattern
- Ensures jest is properly available through npm scripts

Fixes #91

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -111,7 +111,7 @@ jobs:
       run: npm ci --prefer-offline --no-audit
 
     - name: Generate test coverage
-      run: npx jest --coverage --testPathPattern='test/(unit|integration).*\.test\.js$'
+      run: npm run test:ci
       env:
         NODE_ENV: test
         BOT_USERNAME: '@TestBot'

package.json

@@ -11,7 +11,7 @@
     "test:e2e": "jest --testMatch='**/test/e2e/**/*.test.js'",
     "test:coverage": "jest --coverage",
     "test:watch": "jest --watch",
-    "test:ci": "jest --ci --coverage",
+    "test:ci": "jest --ci --coverage --testPathPattern='test/(unit|integration).*\\.test\\.js$'",
     "pretest": "./scripts/utils/ensure-test-dirs.sh",
     "lint": "eslint src/ test/ --fix",
     "lint:check": "eslint src/ test/",