feat: Add build artifact link to Slack pulse footer

Adds a "Get build artifact link" step that looks up the most recent
successful run of the caller repo's Build workflow (build.yml) for
the PR's head SHA, resolves its uploaded artifact, and appends a
"Build Artifact" link to the Slack notification footer alongside the
PR # and Jira ticket links. Skips gracefully if no matching run or
artifact is found.

Ref: ED-24831
Co-authored-by: Cursor <cursoragent@cursor.com>

Author: annab1

actions/product-pulse/action.yml

@@ -37,6 +37,31 @@ runs:
 
               gh pr diff "$PR_NUMBER" > /tmp/diff.txt || echo "No diff available"
 
+        - name: Get build artifact link
+          id: artifact
+          shell: bash
+          env:
+              GH_TOKEN: ${{ github.token }}
+              REPO: ${{ github.repository }}
+              HEAD_SHA: ${{ github.event.pull_request.head.sha }}
+          run: |
+              RUN_ID=$(gh api "repos/${REPO}/actions/workflows/build.yml/runs?head_sha=${HEAD_SHA}&status=success" --jq '.workflow_runs[0].id // empty' 2>/dev/null || echo "")
+
+              if [ -z "$RUN_ID" ]; then
+                echo "⚠️  No successful Build workflow run found for this PR, skipping artifact link"
+                exit 0
+              fi
+
+              ARTIFACT_ID=$(gh api "repos/${REPO}/actions/runs/${RUN_ID}/artifacts" --jq '.artifacts[0].id // empty' 2>/dev/null || echo "")
+
+              if [ -z "$ARTIFACT_ID" ]; then
+                echo "⚠️  No build artifact found for run $RUN_ID, skipping artifact link"
+                exit 0
+              fi
+
+              echo "🔗 Found build artifact: https://github.com/${REPO}/actions/runs/${RUN_ID}/artifacts/${ARTIFACT_ID}"
+              echo "build_artifact_url=https://github.com/${REPO}/actions/runs/${RUN_ID}/artifacts/${ARTIFACT_ID}" >> $GITHUB_OUTPUT
+
         - name: Install Cursor CLI
           shell: bash
           run: |
@@ -203,6 +228,7 @@ runs:
               TYPE: ${{ steps.update.outputs.type }}
               LOOM_URL: ${{ steps.update.outputs.loom_url }}
               JIRA_URL: ${{ steps.update.outputs.jira_url }}
+              BUILD_ARTIFACT_URL: ${{ steps.artifact.outputs.build_artifact_url }}
               PR_NUMBER: ${{ inputs.pr-number }}
               PR_URL: ${{ github.event.pull_request.html_url }}
           run: |
@@ -232,6 +258,9 @@ runs:
                 TICKET=$(echo "$JIRA_URL" | grep -oE '[A-Z][A-Z0-9]+-[0-9]+$')
                 FOOTER="${FOOTER}  ·  <${JIRA_URL}|${TICKET}>"
               fi
+              if [ -n "$BUILD_ARTIFACT_URL" ]; then
+                FOOTER="${FOOTER}  ·  <${BUILD_ARTIFACT_URL}|Build Artifact>"
+              fi
 
               BLOCKS=$(jq -n \
                 --arg title "$TITLE" \