Add Homebrew tap update to release workflow

Triggers repository_dispatch to yepzdk/homebrew-tools after
release is created, which updates the formula automatically.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: yepzdk

.github/workflows/release.yaml

@@ -32,3 +32,15 @@ jobs:
             dist/csm-linux-amd64
             dist/csm-linux-arm64
           generate_release_notes: true
+
+      - name: Update Homebrew formula
+        env:
+          HOMEBREW_TAP_TOKEN: ${{ secrets.HOMEBREW_TAP_TOKEN }}
+          TAG_NAME: ${{ github.ref_name }}
+        run: |
+          VERSION="${TAG_NAME#v}"
+          curl -X POST \
+            -H "Accept: application/vnd.github+json" \
+            -H "Authorization: token $HOMEBREW_TAP_TOKEN" \
+            https://api.github.com/repos/yepzdk/homebrew-tools/dispatches \
+            -d "{\"event_type\":\"update-csm\",\"client_payload\":{\"version\":\"$VERSION\"}}"