ci(release): skip homebrew tap and mcp registry on prerelease tags

Mark GitHub releases as prerelease when the version contains a hyphen
(e.g. 2.4.0-beta.1), and gate the update_homebrew_tap and mcp_registry
jobs on stable versions only. Without this, a beta tag would overwrite
the main Homebrew formula and push beta builds onto every brew install
user, and would publish the prerelease to the MCP Registry as if it
were the canonical version.

Author: cameroncooke

.github/workflows/release.yml

@@ -158,7 +158,7 @@ jobs:
           files: |
             xcodebuildmcp-${{ steps.get_version.outputs.VERSION }}.tgz
           draft: false
-          prerelease: false
+          prerelease: ${{ contains(steps.get_version.outputs.VERSION, '-') }}
 
       - name: Summary
         env:
@@ -176,7 +176,7 @@ jobs:
           fi
 
   mcp_registry:
-    if: github.event_name == 'push'
+    if: github.event_name == 'push' && !contains(needs.release.outputs.version, '-')
     needs: release
     runs-on: ubuntu-latest
     env:
@@ -391,7 +391,7 @@ jobs:
             --repo "$REPOSITORY"
 
   update_homebrew_tap:
-    if: github.event_name == 'push'
+    if: github.event_name == 'push' && !contains(needs.release.outputs.version, '-')
     needs: [release, build_and_package_macos, publish_portable_assets]
     runs-on: ubuntu-latest
     env: