Fix release formatting to support Major/Minor/Patch changes

[konard]

Summary

Fixes #5 - Resolves two bugs in GitHub release formatting:

1. Removes incorrect section headers ("### Minor Changes", "### Major Changes", "### Patch Changes") from release notes
2. Enables PR detection for all release types (Major, Minor, Patch)

Problem

The scripts/format-release-notes.mjs script only handled ### Patch Changes sections, causing it to fail on Minor and Major releases:

• ❌ Section headers remained in release notes
• ❌ PR detection was skipped
• ❌ Release formatting failed silently

Root Cause

The script at scripts/format-release-notes.mjs (lines 92-115) only matched ### Patch Changes:

// Old code - only matched Patch changes
const patchChangesMatchWithHash = currentBody.match(
  /### Patch Changes\s*\n\s*-\s+([a-f0-9]+):\s+(.+?)$/s
);

When a Minor or Major release was created:

1. The regex pattern failed to match
2. The script exited early with "⚠️ Could not parse patch changes"
3. The section header remained in the release notes
4. PR detection was skipped entirely

Solution

Updated the regex to match all changeset types:

// New code - matches Major, Minor, and Patch changes
const changesPattern =
  /### (Major|Minor|Patch) Changes\s*\n\s*-\s+(?:([a-f0-9]+):\s+)?(.+?)$/s;

Changes Made

Modified Files:

• scripts/format-release-notes.mjs - Fixed regex pattern to handle all changeset types and updated PACKAGE_NAME constant

Testing:

• experiments/test-regex-pattern.mjs - Comprehensive test script verifying the regex pattern handles all formats correctly

Implementation Details

The fix:

1. Updated regex pattern to match ### (Major|Minor|Patch) Changes instead of just ### Patch Changes
2. Extracts the change type (Major/Minor/Patch) from the match
3. Handles both formats: with commit hash (- abc1234: Description) and without (- Description)
4. Updated PACKAGE_NAME constant to gh-download-pull-request to match package.json
5. Added comprehensive test script to verify the fix works correctly

Testing

• ✅ All 5 test cases pass in experiments/test-regex-pattern.mjs
• ✅ Lint checks pass (npm run lint)
• ✅ Format checks pass (npm run format:check)
• ✅ File size checks pass (npm run check:file-size)

Expected Behavior After Fix

Release notes will now display cleanly for all release types:

Add new feature description
- Detailed description of changes
...

**Related Pull Request:** #123

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[![npm version](https://img.shields.io/badge/npm-0.3.0-blue.svg)](https://www.npmjs.com/package/gh-download-pull-request/v/0.3.0)

✅ No section headers
✅ PR link included (when available)
✅ Clean formatting

Reference

This bug was discovered and fixed in the upstream template repository:

• Template Repository: Release formatting script only handles Patch changes, not Minor/Major js-ai-driven-development-pipeline-template#3
• Reference Fix: Fix release formatting to remove incorrect section headers and link PRs link-assistant/agent#59

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[konard]

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