feat(codegen-csharp)!: drop uuid_array/text_array dbColumnType; uuid[] from field.uuid+isArray (phase 1)

[dmealing]

Summary

• Remove uuid_array and text_array from the C# @dbColumnType closed value-set (DbConstants.cs). The loader now rejects both with ERR_BAD_ATTR_VALUE. Array-ness is derived from isArray: true on the field — no explicit override needed.
• Confirm field.uuid isArray:true already emits ICollection<Guid> + .PrimitiveCollection(...) via the existing scalar-array path (ScalarFor("uuid") == "Guid"). No codegen fix needed — behaviour was already correct.
• Add TDD tests: 2 loader tests asserting uuid_array/text_array are rejected; 3 codegen tests asserting field.uuid isArray:true → ICollection<Guid> + PrimitiveCollection (compile-checked).

Part of dbColumnType slim-and-derive Phase 1.

Changed files

• server/csharp/MetaObjects/Persistence/Db/DbConstants.cs — remove DB_COLUMN_TYPE_UUID_ARRAY, DB_COLUMN_TYPE_TEXT_ARRAY constants and from VALID_DB_COLUMN_TYPES
• server/csharp/MetaObjects/Loader/ValidationPasses.cs — remove uuid_array/text_array arm from the subtype-pairing switch
• server/csharp/MetaObjects.Conformance.Tests/R6Plan2LoaderTests.cs — 2 new tests asserting removed values are ERR_BAD_ATTR_VALUE
• server/csharp/MetaObjects.Codegen.Tests/ScalarArrayCodegenTests.cs — 3 new tests for field.uuid isArray:true → ICollection<Guid> + PrimitiveCollection (+ compile check)

Test evidence

Full C# suite: 668 + 42 + 251 + 290 = 1251 passing, 1 skip (pre-existing), 0 failures (dotnet test).

Note

db.json description and fixtures/registry-conformance/expected-registry.json are cross-port shared files; updating them must be coordinated across all 5 ports as a follow-on cross-port PR (not in scope for this C#-only phase-1 PR).

Test plan

• dotnet test --filter "FullyQualifiedName~R6Plan2LoaderTests" — 2 new + 10 existing pass
• dotnet test --filter "FullyQualifiedName~ScalarArrayCodegenTests" — 3 new + 10 existing pass
• Full dotnet test — all green

🤖 Generated with Claude Code

https://claude.ai/code/session_01LuZWKnWzYGVnESijL7uuky

[dmealing]

Folded into the integrated Phase-1 PR (feat/dbcolumntype-slim-derive) which merges all five ports atomically — that's the one that lands. Keeping this open for per-port review history.

[dmealing]

Landed via the integrated Phase-1 PR #121 (squash-merged to main).