## What
Adds `pr-simplify`, a Fabro workflow that runs a "simplify" code-review
pass over an existing PR and updates that same PR in place.
## How it works
- **One agent, three parallel reviews.** A single agent node runs the
pass and uses `spawn_agent` to fan out three reviewers — code reuse,
code quality, and efficiency — concurrently, then aggregates their
findings. Sub-agent results return directly to the orchestrator, which
is the clean way to aggregate multiple perspectives. (A fork +
`tripleoctagon` fan-in was the wrong primitive here: fan-in selects a
single "best" branch and merges only its worktree, so it would silently
drop two of the three reviews.)
- **Updates the existing PR — no new PR.** The agent runs `gh pr
checkout` on the PR's branch, applies the fixes, commits, and pushes —
landing one fixup commit on the existing PR, plus a summary comment and
a `simplify:<model>` label. `[run.pull_request] enabled = false` keeps
Fabro from opening a second PR from its run branch.
- **Fable by default, overridable.** The graph sets
`default_model=claude-fable-5`, which floors the orchestrator and all
three reviewers to Fable. `--model <id>` wins over it per run
(`configured model → graph default_model → catalog default`), and the
label reflects whatever actually ran.
## Usage
```bash
fabro run pr-simplify -I pr=<number> # Fable (default)
fabro run pr-simplify -I pr=<number> --model gpt-55 # override the model
```
Requires GitHub token permissions `contents` / `pull_requests` /
`issues` = write (declared in the workflow) so it can push the commit,
comment, and label.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
---------
Signed-off-by: Bryan Helmkamp <19+brynary@users.noreply.github.com>
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
Co-authored-by: Bryan Helmkamp <19+brynary@users.noreply.github.com>
