docs(adr): 0009-build-path#97
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…perimental Closes #61. Four parallel build-environment definitions (`flake.nix`, `.guix-channel` / `guix.scm`, `Containerfile`, `.devcontainer/`) plus the implicit `cargo build` lived side-by-side. None was documented as canonical, so new contributors had to guess. ADR-0009 picks **two canonical paths**: - **`cargo build` for development.** Direct Rust toolchain, fastest iteration, MSRV-pinned via V-L3-K1 (#57). - **`Containerfile` for ops.** OCI image suitable for deployment, CI, reproducible release builds. Complementary to the V-L3-L1 (#58) release workflow that produces native binaries. Everything else (`flake.nix`, `guix.scm`, `.guix-channel`, `.devcontainer/`) is **experimental**: kept in the tree, not maintained, not CI-tested. Re-promotable via a future ADR if a maintainer emerges. Alternatives considered: - Pick exactly one path: rejected; dev vs ops have legitimately different cost-benefit profiles. - Delete the experimental files: rejected; no CI cost to keeping them, someone put work in. Follow-up: small README "Install" rewrite (separate PR). Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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Summary
Per V-L3-P1: four build-environment files (
flake.nix,guix.scm/.guix-channel,Containerfile,.devcontainer/) plus implicitcargo buildcoexisted, none documented as canonical.ADR-0009 picks two canonical paths:
cargo buildfor dev. Direct toolchain, fastest iteration, MSRV-pinned (V-L3-K1, V-L3-K1: add rust-version (MSRV) to Cargo.toml; CI matrix #57).Containerfilefor ops. OCI image for deployment, CI, reproducible release builds. Complements the V-L3-L1 (V-L3-L1: add release workflow building binaries for 4 targets #58) native-binary release workflow.Everything else is experimental — kept in the tree, not maintained, not CI-tested. Re-promotable later if a maintainer emerges.
Alternatives considered: "pick exactly one" (rejected — dev and ops are legitimately different) and "delete experimental files" (rejected — no CI cost to keeping them).
Follow-up: small README "Install" rewrite as a separate PR.
Closes
Test plan
docs/decisions/0009-build-path.adocrecords the decision + alternatives + consequencesDoc-only.