fix: split test/coverage scripts for Node 20 compat

Node 20 doesn't support --test-coverage-* threshold flags.
- test: basic test run (all Node versions)
- test:coverage: full coverage enforcement (Node 22+)
- check: lint + test:coverage
- CI: Node 22 runs check, Node 20 runs lint + test

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: BrainSlugs83

.github/workflows/ci.yml

@@ -18,4 +18,10 @@ jobs:
         with:
           node-version: ${{ matrix.node-version }}
       - run: npm ci
-      - run: npm run check
+      # Node 22+ supports coverage thresholds; Node 20 runs tests only
+      - name: Lint + test with 100% coverage
+        if: matrix.node-version >= 22
+        run: npm run check
+      - name: Lint + test (no coverage enforcement)
+        if: matrix.node-version < 22
+        run: npm run lint && npm test

package.json

@@ -38,8 +38,9 @@
   ],
   "scripts": {
     "lint": "eslint index.js vector-memory-server.js embed-worker.js lib.js",
-    "test": "node --test --experimental-test-coverage --test-coverage-lines=100 --test-coverage-branches=100 --test-coverage-functions=100 --test-coverage-exclude=test.js test.js",
-    "check": "npm run lint && npm run test"
+    "test": "node --test test.js",
+    "test:coverage": "node --test --experimental-test-coverage --test-coverage-lines=100 --test-coverage-branches=100 --test-coverage-functions=100 --test-coverage-exclude=test.js test.js",
+    "check": "npm run lint && npm run test:coverage"
   },
   "dependencies": {
     "@modelcontextprotocol/sdk": "^1.0.0",