Build action with Slack integration

Rebuilt the compiled dist files to include the Slack notification
code that was added in the previous commit but not compiled.

The dist/index.js file now includes the postToSlack function and
all Slack integration logic.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: dpguthrie