## Problem
The `2-14:fix-standard-relation-field-labels-icons` workspace upgrade
command aborts the upgrade, failing for every workspace that has drift
to heal with:
```
FIELD_MUTATION_NOT_ALLOWED: System fields only allow updating: universalSettings, isActive. Forbidden properties: icon
```
The default relation fields it heals (note/task/attachment/timeline) on
standard objects are **system-owned**. The flat-field-metadata validator
forbids mutating any property other than `universalSettings`/`isActive`
on a system field **unless the migration runs as a system build**
(`buildOptions.isSystemBuild`). The command omitted `isSystemBuild`, so
it defaulted to `false` and the heal was rejected.
## Fix
Pass `isSystemBuild: true` when building the heal migration — consistent
with every other standard-metadata upgrade command (2-3, 2-5, 2-7, 2-8,
2-9, 2-10, 2-13, other 2-14 commands).
## Notes
- Follow-up to #21658, which added the error-surfacing diagnostics that
revealed this root cause but did not include this fix.
- `label` and `icon` are both in
`FLAT_FIELD_METADATA_RELATION_PROPERTIES_TO_COMPARE`, so the
relation-field validator (not gated on `isSystemBuild`) already permits
them — the system-build flag was the only blocker.
- Dry-run returns before the build step, so this only manifests on real
runs.
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Charles Bochet
b327999b04
