fix: move PR data file to working directory for Claude access (#92)

* fix: update all GitHub Actions to latest versions for Node.js 24 full support

- Update actions/checkout from v4.2.2 to v7.0.1
- Update google-github-actions/auth from v2.1.4 to v3.0.0

These versions are fully compatible with Node.js 24 and eliminate all
deprecation warnings in workflow logs.

* fix: enable GCP credential file and environment variables for Claude access

Claude needs access to GCP credentials to authenticate with Vertex API.
Changed:
- create_credentials_file: true (was false)
- export_environment_variables: true (was false)

This allows the google-github-actions/auth action to create the credential
file and set GOOGLE_APPLICATION_CREDENTIALS so Claude can access it.

* fix: move PR data file to working directory for Claude access

Claude can only access files within the job's working directory
(/home/runner/work/hyperfleet-claude-plugins/hyperfleet-claude-plugins).

Changed data file location from /tmp/pr-data.json to pr-data.json.

Author: rafabene

.github/workflows/open-prs-digest.yml

@@ -101,15 +101,15 @@ jobs:
           GH_TOKEN: ${{ secrets.GH_TOKEN_ORG_READ }}
         run: |
           set -euo pipefail
-           ./hyperfleet-work-triage/skills/open-prs/scripts/collect-data.sh > /tmp/pr-data.json
+          ./hyperfleet-work-triage/skills/open-prs/scripts/collect-data.sh > pr-data.json
 
       - name: Run /open-prs via Claude
         uses: anthropics/claude-code-action@6dcf93138bbf3e264225a6c7ceecd5aa2205469d # v1.0.221
         id: claude
         with:
           use_vertex: "true"
           prompt: |
-            Process the collected PR data from /tmp/pr-data.json.
+            Process the collected PR data from pr-data.json.
             Follow SKILL.md instructions: pipe through score.jq,
             classify Factor 4 for each PR, then pipe through format-output.jq with --arg mode slack.
             Output ONLY the final Slack mrkdwn content — no surrounding explanation or code blocks.