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## Summary
This PR makes agent execution a strict two-backend contract: API-backed
stages use Fabro-owned model/provider auth, while ACP-backed stages
launch a user-supplied stdio process that owns its own auth and tools.
That removes the legacy CLI backend and prevents ACP execution from
accidentally resolving or forwarding provider credentials.
## Changes
- Replaces the old `api`/`cli`/`acp` backend model with `AgentBackend {
api, acp }`, with `backend=\"cli\"` rejected and migrated toward
explicit ACP process configuration.
- Splits ACP process configuration into `acp.command` for shell command
strings and `acp.config` for JSON stdio configs, while rejecting legacy
`acp_command`.
- Restricts ACP to `agent` nodes and rejects API-only attributes such as
`model`, `provider`, `reasoning_effort`, `max_tokens`, and `speed` on
ACP nodes.
- Deletes the workflow CLI runtime, CLI credential resolver surface, CLI
live smoke tests, and `agent.cli.*` event handling.
- Updates ACP events and projections to report process identity
(`command`, optional `config_name`) rather than provider/model metadata.
- Updates import/stylesheet propagation, CLI workflow smoke coverage,
server steering tests, and web model extraction for the new
event/backend contract.
## Validation
- `cargo check -p fabro-auth -p fabro-acp -p fabro-workflow -p fabro-cli
--all-targets`
- `cargo nextest run -p fabro-auth -p fabro-acp -p fabro-validate -p
fabro-store -p fabro-workflow --lib`
- `cargo nextest run -p fabro-acp`
- `cargo nextest run -p fabro-cli --test it
workflow::acp::acp_backend_workflow`
- `cargo nextest run -p fabro-workflow --test it
codergen_without_backend_simulated`
- `cargo nextest run -p fabro-workflow --test it
import_e2e_through_engine`
- `cargo nextest run -p fabro-workflow --test it stylesheet_application`
- `cargo nextest run -p fabro-server
steer_with_active_acp_stage_returns_non_steerable_conflict`
- `cargo nextest run -p fabro-server
active_acp_stage_marker_clears_on_terminal_paths`
- `cargo nextest run -p fabro-types
agent_backend_accepts_only_api_and_acp`
- `cd apps/fabro-web && bun test app/routes/run-stages.test.ts`
- `cd apps/fabro-web && bun run typecheck`
- `cargo +nightly-2026-04-14 fmt --check --all`
- `cargo +nightly-2026-04-14 clippy --workspace --all-targets -- -D
warnings`
---
[](https://github.com/EveryInc/compound-engineering-plugin)
🤖 Generated with GPT-5 via [Codex](https://openai.com/codex)
---------
Co-authored-by: Peter Bell <4843+PeterBell@users.noreply.github.com>
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