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docs(contributing): state the proof lane's platform and font prerequisites #1088

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docs(contributing): state the proof lane's platform and font prerequisites #1088

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14 changes: 14 additions & 0 deletions CONTRIBUTING.md
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Expand Up @@ -58,6 +58,20 @@ The full repository gate is:
uv tool run --from 'nox[uv]==2026.4.10' nox -f noxfile.py -s verify
```

That gate includes a `participant-opacity-proof` lane, which replays the pinned
Isabelle proof offline. The lane runs on Linux x86_64 only. It needs
`bubblewrap` to enforce the offline replay, and a fontconfig setup with at least
one installed font, because Isabelle starts a JVM that will not run without one:

```shell
sudo apt-get install bubblewrap fontconfig fonts-dejavu-core
```

Without fonts, the lane reports that the Isabelle kernel rejected the fixed
proof session, which reads as a failing proof rather than a missing
prerequisite. Run the gate on Linux, or rely on continuous integration, when
your workstation is another platform.

Run the change-aware local gate while iterating:

```shell
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