Bring in the finished Go rewrite (developed under the placeholder name
"duo") as the v2 codebase. Code-only import — no upstream git history.
Config- and plugin-driven coding agent: registry core, OpenAI-compatible
providers, builtin tools, MCP (stdio + HTTP) plugins, permission + sandbox,
custom slash commands, @-references, two-model collaboration.
Renamed throughout: duo→reasonix, Duo→Reasonix, DUO→REASONIX — module path,
imports, CLI name, cmd/ dirs, reasonix.toml, .reasonix/commands, and
$REASONIX_* env prefixes. Kept the v2 MIT LICENSE (the Go project had none).
Verified: go build ./... · go vet ./... · go test ./... all green; gofmt clean.
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
