feat: add AI-assisted changelog generation (#21743)

Co-authored-by: Amp <amp@ampcode.com>
Co-authored-by: Emma Jamieson-Hoare <emmajam@users.noreply.github.com>
Co-authored-by: Emma Jamieson-Hoare <ejamieson19@gmail.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

.github/workflows/changelog.yml

@@ -0,0 +1,22 @@
+name: Changelog
+
+on:
+  pull_request:
+    types: [opened, synchronize]
+
+jobs:
+  changelog:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          ref: ${{ github.head_ref }}
+      - run: npm install -g @anthropic-ai/claude-code
+      - uses: wevm/changelogs-rs/gen@master
+        with:
+          ai: 'claude -p'
+        env:
+          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}