Suppress false assumed-(required) handling for primitive entity IDs

[Copilot]

Entity state IDs are implicitly treated as (required), but that assumption was leaking onto primitive IDs such as int32, producing misleading warnings and incorrect validation behavior. This change narrows implicit required handling to field types that actually support (required).

• Behavior change

  • Skip generated (required) validation for implicitly required IDs whose field type does not support the option.
  • This prevents primitive entity IDs from being treated as missing/invalid solely because they are the first field.

• Regression coverage

  • Add a validating test fixture for an entity state with an int32 ID.
  • Add runtime coverage asserting such a message remains valid when the primitive ID is omitted.
  • Add compiler-side coverage asserting no warning is emitted for the implicit primitive ID case.

• Why this matters

  • Keeps implicit entity ID conventions aligned with actual (required) semantics.
  • Avoids diagnostics that imply a field is incorrectly using (required) when the field was only inferred by convention.

Example covered by the change:

message NumberStats {
    option (entity).kind = ENTITY;
    int32 id = 1;
}

Before this change, the first field could be treated as implicitly (required) despite int32 not supporting that option. With this update, primitive IDs like the above are ignored by required-field generation.

Warning

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• www.jetbrains.com
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