Windows Preview (Unsigned) (befff9b)

chore(release): prepare cargo-ai 0.3.1 (#108)

- bump Cargo AI package and lockfile versions to 0.3.1
- add 0.3.1 release notes and link them from the README
- clarify pre-1.0 compatible additive release policy for the 0.3.x line

Related to: CAI-2099

chore(release): prepare cargo-ai 0.3.0 draft

- Bump package metadata and lockfile root entry to 0.3.0
- Add public 0.3.0 release notes with approved public notes
- Update versioning rationale and README release links

Related to: CAI-2080

chore: update to V0.0.8 (#31)