v0.3.0: docs: update CHANGELOG for v1.6 (#79)

## Summary
- add a `v1.6` changelog entry for the critical bubblewrap support fix
from #77

## Testing
- not run (docs-only change)

Co-authored-by: Codex <noreply@openai.com>

v0.2.0

Sync with upstream changes

v0.1.0

Maps to v1 on original repo