CI: type check the JSR package (deno publish --dry-run)

JSR type checks with Deno's TypeScript, which is stricter than ours (typed arrays
are generic over their buffer), so a release could publish to npm and then fail
on JSR. The Deno job on Linux now runs the dry run.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Lfv41PqHEGbU7SLg5onpG1

Author: matmen

.github/workflows/node.yml

@@ -73,3 +73,6 @@ jobs:
       run: deno run -A tests/run.js
     - if: matrix.runtime == 'bun'
       run: bun tests/run.js
+    # (JSR type checks the sources with Deno's TypeScript, stricter than ours: what release.yml would publish)
+    - if: matrix.runtime == 'deno' && matrix.os == 'ubuntu-latest'
+      run: deno publish --dry-run --allow-dirty