fix(changelog): keep prior release sections identical to main

CI validate-changelog.py requires every ## [version] block from the base
branch to match exactly; git-cliff had rewritten 0.2.0 and older sections.
Prepend only the new [0.2.1] section and retain origin/main unchanged below.

Author: eddietejeda

CHANGELOG.md

@@ -3,6 +3,7 @@
 ### 📚 Documentation
 
 - *(skill)* Align hotdata skill with CLI behavior
+
 ## [0.2.0] - 2026-04-29
 
 ### 🚀 Features
@@ -24,8 +25,6 @@
 ### 💼 Other
 
 - *(release)* Bump geospatial skill version on release
-- *(deps)* Bump rustls-webpki to 0.103.13
-- Validate CHANGELOG sections match base branch on PRs
 
 ### 🚜 Refactor
 
@@ -38,6 +37,7 @@
 
 ### 🚀 Features
 
+- *(auth)* Add CLI auth session support (JWT access tokens, refresh, PKCE login)
 - *(indexes)* Workspace-wide list with filters and parallel fetch
 
 ### 💼 Other