docs(release-notes): add .github/release-notes/v0.3.1.md with scope c…

…larifications and highlights

chore(release): add .github/v0.3.0.md (GitHub release notes)

Release 0.2.2: shared tool loop, Gemini alignment, streaming fix, fak…

…e backend strictness

fix(config): precedence and overrides; cache env parsing; tests/docs;…

… bump 0.2.1

docs: update What's New and Changelog; bump version to 0.2.0 (no spec…

… changes)

Release 0.1.3