Summary by cubic

Make the sponsors update more consistent by using a single script and only creating PRs when the tracked README.md actually changes. This reduces noisy automated PRs and simplifies the workflow.

Description

• Summary of changes
  • Workflow now calls scripts/sponsors/update-readme-sponsors.mjs and gates all follow-up steps on changed and readme_changed.
  • Adds a step to set readme_changed using git diff --quiet -- README.md.
  • Script refactor: writes changed via GITHUB_OUTPUT, removes shell exec and colorized logs, updates axios import path, and writes ./temp/sponsors.md.
  • .gitignore: adds openspec/.
• Reasoning
  • Avoids PRs when README has no tracked changes.
  • Makes CI behavior predictable and reduces flaky shell interactions.
  • Standardizes logging and outputs for GitHub Actions.
• Additional context
  • Requires marker <!--<div>marker</div>--> in README.md for injection.
  • PRs are created by peter-evans/create-pull-request@v8 only when both flags are true.

Docs

• Update references from ./bin/sponsors.js to scripts/sponsors/update-readme-sponsors.mjs.
• Local run: node scripts/sponsors/update-readme-sponsors.mjs (marker required; writes to ./temp/sponsors.md; GITHUB_OUTPUT not required locally).

Testing

• No tests added.
• Suggested: small unit tests for updateReadmeSponsors (marker present/missing, changed vs up-to-date). CI behavior can be verified by a workflow run where README doesn’t change to ensure the PR step is skipped.

^{Written for commit 54e7556. Summary will update on new commits.}