docs: Update session history for v0.4.0 CI/CD pipeline

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CLAUDE.md

@@ -505,7 +505,7 @@ wp-fedistream/
 - Uses Symfony HTTP Client via the license client package
 - License validation cached for 24 hours using WordPress transients
 
-### 2026-01-29 - CI/CD Pipeline
+### 2026-01-29 - CI/CD Pipeline v0.4.0
 
 **Summary:** Added Gitea Actions workflow for automated release package creation.
 
@@ -517,7 +517,7 @@ wp-fedistream/
 - Automatic translation compilation (.po to .mo)
 - Version verification (plugin version must match tag)
 - Proper WordPress plugin zip structure
-- SHA256 and MD5 checksum generation
+- SHA256 checksum generation
 - Package structure verification
 - Changelog extraction for release notes
 - Automatic Gitea release creation with attachments
@@ -530,6 +530,8 @@ wp-fedistream/
 **Files Modified:**
 
 - `CLAUDE.md` - Added CI/CD documentation and updated directory structure
+- `CHANGELOG.md` - Added v0.4.0 entry
+- `wp-fedistream.php` - Version bump to 0.4.0
 
 **Notes:**
 
@@ -537,3 +539,4 @@ wp-fedistream/
 - Uses `shivammathur/setup-php@v2` for PHP setup
 - Uses `actions/gitea-release-action@v1` for release creation
 - Compatible with GitHub Actions syntax
+- User simplified checksums to SHA256 only (removed MD5)