v0.5.0

Changelog

• 4db8f42 chore(deps): bump actions/checkout from 4 to 7
• c44a9b0 chore(deps): bump actions/setup-go from 5 to 7
• 98d4d0f chore(deps): bump goreleaser/goreleaser-action from 6 to 7
• 38fc050 feat(bashtool): support Windows with native shell resolution
• d4f3b3b feat: add Windows install script (scripts/install.ps1)
• 24f7556 refactor: simplify activity, commands, and thinking block code