* fix(identity): enforce per-tenant uniqueness in Memory identity stores
Mirror EF PerTenantIdentityUniqueness on Memory user, role, and application
stores so a second Id cannot claim the same Name or ClientId within a tenant.
Same-Id upserts may still rename themselves.
Co-authored-by: Sipke Schoorstra <sipkeschoorstra@outlook.com>
* fix(identity): keep Memory identity finds from mutating stored rows
Clone user, role, and application rows on read so a rejected Save of a
Find result cannot leave a colliding name or client id in the store.
Co-authored-by: Sipke Schoorstra <sipkeschoorstra@outlook.com>
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Co-authored-by: Cursor Agent <cursoragent@cursor.com>
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