Release v0.4.2

Release v0.4.1

chore(release): cut 0.4.0 changelog section

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

REST skill expansion + harness hardening

See CHANGELOG.md for details

Baseline isolation fix + fresh eval sweep

- Fix baseline contamination: skills=off runs now isolated in /tmp
- Fresh eval sweep: 91% vs 52% pass rate (+39pp delta)
- Add CHANGELOG.md with semver versioning
- Add readme_snippet.py for benchmark publishing workflow
- Update benchmark reports and README

Initial skills release

- PyGraphistry skills (core, visualization, gfql, connectors)
- Eval harness with 11 journeys
- RTD fallback doc policy
- CI workflow for validation