ADR 0006 — Agent-agnostic router, Claude Code as the v1 backend

Status: accepted 2026-09-13. Historical in part: "v1 accepts only claude-code" no longer holds; Grok Build is a second backend (ADR 0007). The seam itself is as described.

Angelia routes chats to a local coding agent. Routing, sessions, gating, chunking and delivery never mention a specific agent. The Brain interface in src/brain/ is the only seam: start() in a profile cwd, turn(text) yielding progress | permission | result, stop(). profiles.<name>.backend selects the implementation; v1 accepts only claude-code. Candidates for v2: Codex CLI and OpenCode, each needing three facts before an ADR: how a session is resumed by id, how a permission prompt is surfaced without a TTY, and whether the process can stay alive across turns. No backend is added until those are measured the way ADR 0001 measured Claude Code.