🚨 Fix: Commit dist files + Add CHANGELOG for GitHub Action

[petetan]

🚨 Critical Fix: GitHub Action Distribution Files + CHANGELOG

This PR fixes the broken GitHub Action by committing the required distribution files and establishes proper changelog maintenance.

Problem

Users were getting this error when trying to use the action:

Error: File not found: '/home/runner/work/_actions/synctree/releasebot/v1/dist/index.js'

Root Cause

• The dist/ directory was included in .gitignore
• GitHub Actions require pre-built JavaScript files to be committed to the repository
• When users reference @v1, GitHub downloads the repository and expects to find dist/index.js

Solution

• ✅ Removed dist/ from .gitignore
• ✅ Committed all compiled distribution files (dist/index.js, type definitions, source maps)
• ✅ Added comprehensive CHANGELOG.md following Keep a Changelog format
• ✅ This allows GitHub Actions to find and execute the pre-built JavaScript

Files Changed

• .gitignore - Removed dist/ exclusion
• dist/ - Added all 23 compiled distribution files (38,658 lines)
• CHANGELOG.md - Added changelog documenting v1.0.1 fixes and v1.0.0 initial release

Package Management Note

This PR properly uses pnpm-lock.yaml (not package-lock.json) since we use pnpm as our package manager.

Impact

• 🔧 Fixes broken action - Users can now successfully use synctree/releasebot@v1
• 📦 Standard GitHub Actions practice - Most TypeScript-based actions commit their dist/ files
• 📚 Establishes changelog maintenance - Professional release documentation going forward
• 🚀 No breaking changes - Existing workflows will work immediately after merge

Testing

After merge, the action should work correctly when referenced as:

- uses: synctree/releasebot@v1

Related Issues & PRs

• Fixes the deployment issue discovered after the v1.0.1 release
• Supersedes PR [WIP] Release v1.0.1: Fix git symbolic-ref error in GitHub Actions #4 (which used npm instead of pnpm and lacked dist files)
• Incorporates changelog from PR [WIP] Release v1.0.1: Fix git symbolic-ref error in GitHub Actions #4 with corrected dates and additional fixes

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Priority: Critical - This restores functionality for all users of the action and establishes proper release documentation.