Release version 0.3.0

Update changelog with all features, fixes, and changes for the 0.3.0 release.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
Entire-Checkpoint: 17252607bde7

Author: cteyton

CHANGELOG.md

@@ -1,5 +1,7 @@
 # [Unreleased]
 
+# [0.3.0] - 2026-02-23
+
 ## Added
 
 - **Multi-remediation support**: Users can now run multiple independent remediations per evaluation. Each remediation runs from the current git state and produces its own downloadable patch. Past remediations are displayed in a collapsible history section above the config area, with compact cards that expand to show full diffs and action summaries. The 409 guard blocking new remediations when a completed one exists has been removed; only concurrent remediations are prevented.