# ADR 0001 — Go with single-binary role packaging

Status: accepted (2026-07-07) · Plan: rev 3, R3-4

## Context
The OS has three long-running roles (api, scheduler+actuator+learning,
notifier) plus one-shot jobs (migrate, seed, export). Rev 2 planned three
binaries with three Dockerfiles.

## Decision
One Go binary `oikos` with role subcommands (`oikos api | scheduler |
notifier | all | migrate | seed | export`), one multi-stage Dockerfile, one
image tagged `oikos:<git-sha>`. Compose runs the image N times with
different commands (Loki/Temporal pattern). Go over Python for static
typing, small static binaries (CGO_ENABLED=0, distroless), and goroutines
for concurrent probes.

## Consequences
- One build, guaranteed version consistency across roles, trivial local dev
  (`oikos all`), simpler rollback (retag one image).
- Full rewrite of ~4,400 Python lines (logic carries over per plan reuse map).
- All roles share a dependency set; image is slightly larger than per-role
  minimal images — accepted.