Fix: CHANGELOG consistency and generation issues

[bniladridas]

Summary

Fixed CHANGELOG.md formatting inconsistencies and the release workflow that was generating broken changelog entries.

Issues Fixed

1. CHANGELOG.md Formatting

• Problem: v1.8.4 had malformed entries with duplicate sections, orphaned text (# CHANGELOG), and no proper categorization
• Fix: Rewrote entire changelog with consistent ### Fix, ### Feature, ### Chore, etc. sections

2. Missing Versions

• Problem: 20 versions (v1.6.6 - v1.8.3) were missing from changelog
• Fix: Added placeholder entries for all missing versions

3. Release Workflow (release.yml)

• Problem: Generated flat list of entries with - bullets, no categorization
• Fix: Now outputs proper sections:

  ## v1.8.5 (2026-03-23)
  
  ### Fix
  * fix: some fix
  * fix: another fix
  
  ### Feature
  * feat: new feature

4. Enhance Script (enhance_changelog.py)

• Problem: Created nested brackets like [[#123](url)] when issue refs already existed
• Fix: Now only matches standalone #123 patterns, avoids [, (, ), ] characters

Evidence

=== Versions match ===
Git tags:       53
Changelog versions:       53
All versions match!

=== Evidence: Workflow format ===
              echo "### Fix" >> /tmp/new_entries.md
              echo "$FIXES" | sed 's/^[a-f0-9]* /\* /' >> /tmp/new_entries.md

=== Evidence: Enhance script safe ===
    pattern = r"(?<![[])(?<!\()#(\d+)(?!\))(?!\])"

Files Changed

• .github/workflows/release.yml - Fixed changelog generation
• scripts/enhance_changelog.py - Fixed issue link pattern
• CHANGELOG.md - Reformatted and added missing versions

[bniladridas]

Fixed in commits:

• 5a9ed66 - fix: resolve changelog consistency
• 92d039a - docs: include discussions guide

All changelog issues resolved:

• Proper formatting with categorized sections
• All 55 versions now in changelog
• Release workflow fixed
• Issue: Changelog #76