fix(ci): bump Node to 24 for npm Trusted Publishing + clearer manifest error

- npm Trusted Publishing requires Node.js >= 22.14.0 (per npm docs).
  Node 20 doesn't meet that, so bump the wasm publish workflow to Node 24.
  Keep the explicit 'npm install -g npm@latest' as a belt-and-suspenders
  guarantee for the npm >= 11.5.1 requirement.
- Replace the raw KeyError on a missing manifest path with an explicit
  sys.exit message so workflow failures are easier to triage.

.github/workflows/publish-wren-core-wasm.yml

@@ -57,10 +57,11 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: 20
+          # Trusted Publishing requires Node.js >= 22.14.0; pin to 24 (latest LTS line)
+          node-version: 24
           registry-url: https://registry.npmjs.org
 
-      - name: Upgrade npm (Trusted Publishing requires >= 11.5.1)
+      - name: Ensure npm meets Trusted Publishing requirement (>= 11.5.1)
         run: npm install -g npm@latest
 
       - name: Install npm dependencies

.github/workflows/rc-release.yml

@@ -76,6 +76,8 @@ jobs:
           if path is None:
               sys.exit(f\"component '{component}' not found in release-please-config.json\")
           manifest = json.loads(os.environ['MANIFEST_JSON'])
+          if path not in manifest:
+              sys.exit(f\"path '{path}' for component '{component}' not in manifest\")
           print(manifest[path])
           ")
           echo "::notice::Base version for $COMPONENT: $BASE_VERSION (from $MANIFEST_SOURCE)"