ci: add communique to enhance release notes (#411)

## Summary
- Add communique tool to mise.toml
- Add `enhance-release` job to release workflow that runs after release
creation to generate AI-enhanced release notes

## Test plan
- [ ] Verify next release triggers the enhance-release job
- [ ] Confirm ANTHROPIC_API_KEY secret is configured in repo settings

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

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Medium Risk**
> Adds a new post-release GitHub Actions job that uses an external AI
API and an elevated token to modify GitHub release notes; failures or
misconfigured secrets can break the release workflow and token scope
matters.
> 
> **Overview**
> After the `release` job completes, the workflow now runs a new
`enhance-release` job that computes the tag from `package.json` and
calls `communique generate ... --github-release` to update the GitHub
release notes.
> 
> The PR also adds `communique` to `mise.toml` so the tool is available
in CI, and wires in `ANTHROPIC_API_KEY` plus a dedicated
`RELEASE_PLZ_GITHUB_TOKEN` for the release-note update step.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
d2335f661c. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/workflows/release.yml

@@ -25,4 +25,20 @@ jobs:
       - name: Release
         run: ./scripts/postversion.sh
         env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+  enhance-release:
+    needs: [release]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+        with:
+          fetch-depth: 0
+      - uses: jdx/mise-action@c37c93293d6b742fc901e1406b8f764f6fb19dac # v2
+      - name: Enhance release notes with communique
+        run: |
+          TAG_NAME="v$(jq -r .version package.json)"
+          communique generate "$TAG_NAME" --github-release
+        env:
+          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
+          GITHUB_TOKEN: ${{ secrets.RELEASE_PLZ_GITHUB_TOKEN }}

mise.toml

@@ -10,3 +10,4 @@ tasks.release-plz = "./scripts/release-plz.sh"
 node = '24'
 git-cliff = 'latest'
 gh = 'latest'
+communique = 'latest'