[prakashNalla]

What does this change?

onRelease now posts on the released action instead of published. A prerelease that's later promoted to a full release only sends edited and released, so it was never posted. A normal release sends both published and released, so it still posts once.

Closes #109

How I tested this

• npm run typecheck and npm test: typecheck is clean, 387 tests pass.
• Added a test that sends published (prerelease), edited, then released and expects one post. The release tests now send released, and published on its own is ignored, so a normal release isn't posted twice. The new and updated release tests fail on develop.

AI assistance

Claude helped me w/ understand the issue

Checklist

• I was assigned the linked issue
• npm run typecheck and npm test pass
• New behavior has a test in test/
• No tokens or secrets in the diff