# Onefinity firmware — agent guidelines

## Branch model

This fork lives on **two long-lived branches**:

- **`master`** — public-facing fork. General-use upgrades on top of
  upstream OneFinity firmware: V09 UX redesign, Font Awesome 6, faster
  cold boot, macOS dev/deploy tooling, build & flash docs, SD-card
  backup, `/api/diag/timing`, kiosk/tablet polish, and assorted
  bug-fixes. **No A-axis, ATC, hooks, or auxcnc/ESP content.** Aim for
  changes that benefit any Onefinity owner.

- **`esp-a-axis`** — bespoke shop branch. Stacks on top of `master`
  and adds everything specific to the auxcnc-ESP-driven A axis and
  the ATC: `Hooks` (ATC IPC), `AuxAxis` (ESP serial driver),
  `ExternalAxis` (virtual A through gplan), `AuxPreprocessor` (M100-M103),
  Z-A coupling interlock, the A-axis UI surface, and the
  `/api/aux/*` endpoints.

Upstream:
- `upstream` → `https://github.com/OneFinityCNC/onefinity-firmware.git`
- `origin`   → Gitea (`https://gitea.home.muehe.org/muehe/onefinity-firmware.git`)

`origin/pre-split-backup` is a tag preserving the pre-split master
tip. Keep it indefinitely until further notice.

## Where does a change go?

| Change | Branch |
|---|---|
| UI polish, theme, layout that any user benefits from | `master` |
| Build / install / boot performance | `master` |
| Diagnostics, logging, generic Python / Tornado fixes | `master` |
| Anything that touches `AuxAxis`, `ExternalAxis`, `Hooks`, `AuxPreprocessor` | `esp-a-axis` |
| Anything mentioning the auxcnc ESP, `/dev/ttyUSB0`, the M100-M103 ATC pneumatics, or motor index 4 | `esp-a-axis` |
| Z-A coupling interlock, ATC tool change sequencing | `esp-a-axis` |
| A-axis UI (DRO row, jog tile, settings page, A-axis routes) | `esp-a-axis` |
| W → A renames or aux.json migrations | `esp-a-axis` |

When in doubt: ask "would this be useful on a stock Onefinity with no
ESP attached?" If yes → `master`. If no → `esp-a-axis`.

## Workflow

```bash
# Day-to-day shop / hardware work (default)
git checkout esp-a-axis
# … do work, commit …
git push origin esp-a-axis

# Generic improvement to master
git checkout master
# … do work, commit …
git push origin master

# After landing on master, replay esp-a-axis on top
git checkout esp-a-axis
git rebase master
git push --force-with-lease origin esp-a-axis
```

If a change accidentally lands on `master` but is bespoke (touches
the file table above), move it: `git reset --hard <prev>` on master,
cherry-pick onto `esp-a-axis`, force-push master.

## Deploy

- `./deploy.sh local` — UI bundle on `localhost:8770` (tmux session
  `onefin-local`). No controller backend; A-axis row stays hidden.
- `./deploy.sh hardware` — rsync to the Pi over SSH, restart
  `bbctrl.service`. Use the `esp-a-axis` branch on the shop Pi.
- `./deploy.sh prod` — bundle a release tarball.

See `.pi/BUILD.md` for the full build / flash / cross-compile flow.

## Commit before ending a turn; push after significant changes.