v0.4.0

What's Changed

• docs: v0.2.0の公開状態を記録 by @Nagi-Inaba in #2
• docs: clarify PMGS Reference capabilities by @Nagi-Inaba in #3
• feat: add transactional pmgs setup by @Nagi-Inaba in #4
• docs: record v0.3 main integration by @Nagi-Inaba in #5
• feat: improve PMGS Reference v0.4 correctness and AI contracts by @Nagi-Inaba in #6
• docs: record v0.4 main integration by @Nagi-Inaba in #7
• feat: simplify PMGS holder onboarding by @Nagi-Inaba in #8

Full Changelog: v0.2.0...v0.4.0