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LDC-E1207 — Context profile field set twice

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# LDC-E1207 — Context profile field set twice

## What it means

A context profile fixes each of its axes exactly once: the profile is
one coherent snapshot of evaluation settings, not a list of overrides.
When the same field name appears on two lines of one profile, the
compiler stops at the second occurrence.

The repair is to keep a single line per field: merge the two values
into the intended one and delete the other. The passing file below
drops the profile and keeps the package it belongs to.

## Example

```law
language "law.core" version "0.2";
package demo.diagnostics version "0.1.0";
namespace "urn:law:demo:diagnostics";

context profile Demo {
    mode active;
    mode active;
}
```

## Fix

```law
language "law.core" version "0.2";
package demo.diagnostics version "0.1.0";
namespace "urn:law:demo:diagnostics";

entity Applicant;
```

## Engine message

The engine reports this in its own wording:

```text
example.law:7:5: error LDC-E1207: context profile "Demo": field "mode" is set twice (§89.1)
```

## Related

- [LDC-E1206](/diagnostics/LDC-E1206/) — profiles must not extend each other in a loop.
- [Facts and evidence](/constructs/facts-and-evidence/) — what case input may carry.