fix: align GitHub release style with template repository

[konard]

Summary

• Fix release name format to use [js] prefix (e.g., [js] 0.8.4 instead of js 0.8.4)
• Fix changelog path for js releases to use js/CHANGELOG.md instead of root CHANGELOG.md
• This ensures release descriptions contain actual changelog content with PR links and npm badges

Problem

The release script was using incorrect changelog path and release name format:

1. Wrong changelog path: For js- prefixed releases, it was reading ./CHANGELOG.md (root) instead of ./js/CHANGELOG.md
2. Wrong name format: Used js 0.8.3 format instead of [js] 0.8.3

This caused releases to show a generic Release X.X.X description instead of the actual changelog content.

Solution

Updated scripts/create-github-release.mjs to:

1. Read the correct changelog file based on the prefix
2. Format release names with brackets around the prefix

Test plan

• Verify next release uses [js] prefix format in the release name
• Verify next release description contains actual changelog content
• Verify PR link and npm badge appear in release notes

Fixes #121

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[konard]

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