ci(release): Handle artifact roots and empty tap bootstrap

Resolve portable artifact roots dynamically after download to avoid path layout
mismatches in the universal packaging job.

Bootstrap an empty Homebrew tap by creating Formula/, committing to the
default branch, and exiting cleanly. For non-empty repos, detect default
branch for PR base and keep formula updates on version branch.

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

Author: cameroncooke

.github/workflows/release.yml

@@ -290,12 +290,29 @@ jobs:
           name: portable-x64
           path: dist/portable/x64
 
+      - name: Resolve extracted arch roots
+        id: resolve_roots
+        run: |
+          VERSION="${{ needs.release.outputs.version }}"
+          ARM64_ROOT="$(find dist/portable/arm64 -type d -name "xcodebuildmcp-${VERSION}-darwin-arm64" -print -quit)"
+          X64_ROOT="$(find dist/portable/x64 -type d -name "xcodebuildmcp-${VERSION}-darwin-x64" -print -quit)"
+          if [ -z "$ARM64_ROOT" ] || [ -z "$X64_ROOT" ]; then
+            echo "Failed to resolve extracted arch roots."
+            echo "arm64 root: ${ARM64_ROOT:-<missing>}"
+            echo "x64 root: ${X64_ROOT:-<missing>}"
+            echo "--- dist/portable tree (depth 4) ---"
+            find dist/portable -maxdepth 4 -print
+            exit 1
+          fi
+          echo "ARM64_ROOT=$ARM64_ROOT" >> "$GITHUB_OUTPUT"
+          echo "X64_ROOT=$X64_ROOT" >> "$GITHUB_OUTPUT"
+
       - name: Build universal portable artifact
         run: |
           npm run package:macos:universal -- \
             --version "${{ needs.release.outputs.version }}" \
-            --arm64-root "dist/portable/arm64/xcodebuildmcp-${{ needs.release.outputs.version }}-darwin-arm64" \
-            --x64-root "dist/portable/x64/xcodebuildmcp-${{ needs.release.outputs.version }}-darwin-x64"
+            --arm64-root "${{ steps.resolve_roots.outputs.ARM64_ROOT }}" \
+            --x64-root "${{ steps.resolve_roots.outputs.X64_ROOT }}"
 
       - name: Verify universal portable artifact
         run: |
@@ -396,22 +413,36 @@ jobs:
         run: |
           VERSION="${{ needs.release.outputs.version }}"
           BRANCH="xcodebuildmcp-v${VERSION}"
+          DEFAULT_BRANCH="main"
           git clone "https://x-access-token:${GH_TOKEN}@github.com/cameroncooke/homebrew-xcodebuildmcp.git" tap-repo
+          mkdir -p tap-repo/Formula
           cp dist/homebrew/Formula/xcodebuildmcp.rb tap-repo/Formula/xcodebuildmcp.rb
           cd tap-repo
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          if ! git rev-parse --verify HEAD >/dev/null 2>&1; then
+            echo "Tap repo has no commits; bootstrapping ${DEFAULT_BRANCH}."
+            git checkout -b "$DEFAULT_BRANCH"
+            git add Formula/xcodebuildmcp.rb
+            git commit -m "Initialize xcodebuildmcp formula ${VERSION}"
+            git push origin "$DEFAULT_BRANCH"
+            exit 0
+          fi
+          DETECTED_BRANCH="$(gh repo view cameroncooke/homebrew-xcodebuildmcp --json defaultBranchRef -q .defaultBranchRef.name 2>/dev/null || true)"
+          if [ -n "$DETECTED_BRANCH" ]; then
+            DEFAULT_BRANCH="$DETECTED_BRANCH"
+          fi
           if git diff --quiet Formula/xcodebuildmcp.rb; then
             echo "Formula already up to date; skipping PR."
             exit 0
           fi
-          git checkout -b "$BRANCH"
-          git config user.name "github-actions[bot]"
-          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git checkout -B "$BRANCH"
           git add Formula/xcodebuildmcp.rb
           git commit -m "xcodebuildmcp ${VERSION}"
-          git push origin "$BRANCH"
+          git push --set-upstream origin "$BRANCH"
           gh pr create \
             --repo cameroncooke/homebrew-xcodebuildmcp \
             --title "Update xcodebuildmcp to ${VERSION}" \
             --body "Automated formula update for xcodebuildmcp ${VERSION}." \
-            --base main \
+            --base "$DEFAULT_BRANCH" \
             --head "$BRANCH"