fix(ci): restore conventional commit categorization

[CalvinAllen]

Summary

Restore categorized sections based on conventional commit prefixes:

• 🐛 Bug Fixes (fix)
• ⚡ Performance & Improvements (perf, refactor)
• 🎉 New Features (feat)
• 🔧 Maintenance (docs, style, test, build, ci, chore)
• 📦 Other (uncategorized)

Additional changes:

• Entries within each section are sorted by issue number (ascending)
• Issue number shown at the front of each entry
• Revert commits are omitted from the changelog
• Keeps the /release-note highlight feature from PR comments

Example Output

### ✨ Highlights

- Shim binary is now 56% smaller with faster startup

### 🐛 Bug Fixes

- #55 - fix(init): use system path on windows for correct priority (925d7bb)
- #59 - fix(shim): propagate exit code instead of reporting failure on windows (831a6c3)

### ⚡ Performance & Improvements

- #72 - perf(shim): optimize shim startup time and binary size (abc1234)
- #74 - refactor(shim): implement lite provider interface (7eddaac)

### 🎉 New Features

- #54 - feat(list): show all runtimes and indicate global version (bae8e28)

### 🔧 Maintenance

- chore(ci): skip build for changelog workflow changes (a650738)
- docs: update documentation for today's changes (da237dd)

Test plan

• Run "Preview Changelog" workflow to verify categorization works
• Verify entries are sorted by issue number within each category
• Verify issue number appears at the front of each entry

[CalvinAllen]

/skip-changelog