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LDC-E1378 — Entity name assigned twice

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# LDC-E1378 — Entity name assigned twice

## What it means

A case can attach display labels to an entity: one name per language
and status. Two labels with the same language and status but different
text assign the entity two different names in the same seat — the case
calls it one thing and another. The compiler stops at the block: a
name assigned twice is no name the reader can trust.

The repair is to keep one label per language and status. Translations
into other languages, or other statuses, are separate seats; the same
seat holds exactly one text.

## Example

```run
{"argv": ["lower-case", "$ROOT/case.law"], "files": {"case.law": "language \"law.core\" version \"0.2\";\npackage demo.diagnostics version \"0.1.0\";\nnamespace \"urn:law:demo:diagnostics\";\n\nentity A;\n\ncase Solo {\n    context {\n        legal_time @2026-08-26;\n    }\n\n    entity_labels \"urn:law:demo:diagnostics#e1\" {\n        label ru official \"claim one\";\n        label ru official \"claim two\";\n    }\n}\n"}, "expect": "LDC-E1378"}
```

## Fix

```run
{"argv": ["lower-case", "$ROOT/case.law"], "files": {"case.law": "language \"law.core\" version \"0.2\";\npackage demo.diagnostics version \"0.1.0\";\nnamespace \"urn:law:demo:diagnostics\";\n\nentity A;\n\ncase Solo {\n    context {\n        legal_time @2026-08-26;\n    }\n\n    entity_labels \"urn:law:demo:diagnostics#e1\" {\n        label ru official \"claim one\";\n    }\n}\n"}, "expect": null}
```

## Engine message

The engine reports this in its own wording:

```text
$ROOT/case.law:12:5: error LDC-E1378: entity_labels "urn:law:demo:diagnostics#e1": two labels of language ru and status official differ in text or forms — one name is assigned twice (§168.6, DECISION-0394)
```

## Related

- [LDC-E1315](/diagnostics/LDC-E1315/) — lowering a file that declares no case.