HYPERFLEET-1131 - ci: skip version bump check for non-contract PRs

Only require version bump when .tsp files change. Docs, CI, and
tooling PRs no longer trigger unnecessary releases.

Author: kuudori

.github/workflows/ci.yml

@@ -15,11 +15,13 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
 
       - name: Setup Node.js
         uses: actions/setup-node@v6
         with:
-          node-version: '20'
+          node-version: "20"
 
       - name: Install dependencies
         run: npm ci
@@ -43,7 +45,24 @@ jobs:
         run: |
           npx spectral lint schemas/core/openapi.yaml schemas/gcp/openapi.yaml --format github-actions --fail-severity warn
 
+      - name: Check for contract changes
+        id: contract
+        run: |
+          BASE_REF="${{ github.event.pull_request.base.sha || github.event.before }}"
+          if [ -z "$BASE_REF" ] || ! git cat-file -e "$BASE_REF" 2>/dev/null; then
+            echo "changed=true" >> "$GITHUB_OUTPUT"
+            exit 0
+          fi
+          CHANGED=$(git diff --name-only "$BASE_REF" HEAD -- '*.tsp')
+          if [ -n "$CHANGED" ]; then
+            echo "changed=true" >> "$GITHUB_OUTPUT"
+          else
+            echo "changed=false" >> "$GITHUB_OUTPUT"
+            echo "No contract files changed — skipping version bump check"
+          fi
+
       - name: Check version bump
+        if: steps.contract.outputs.changed == 'true'
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |