accordproject / concerto / 41532000557

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fix(concerto-core): reject imports that share a local name (#1602)

Importing the same short name from two namespaces was accepted, and the
last import silently won:

    import org.first@1.0.0.{ Chocolate }
    import org.second@1.0.0.{ Chocolate }

A field typed Chocolate then resolved to org.second@1.0.0.Chocolate with
no error. An alias matching another imported name did the same.

ModelFile now records these clashes while reading imports, and validate()
throws after the existing import checks, so the different-versions error
keeps taking precedence. Importing the same type twice is still allowed.

Signed-off-by: rajanpanth <rajan.pantha@samriddhicollege.edu.np>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

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