Move CaseConversionPolicy to public SpacetimeDB namespace (#4382)

Move `CaseConversionPolicy` from `SpacetimeDB.Internal` to the public
`SpacetimeDB` namespace so module authors can write:

```csharp
[SpacetimeDB.Settings]
public const CaseConversionPolicy CASE_CONVERSION_POLICY = CaseConversionPolicy.SnakeCase;
```

instead of the verbose:

```csharp
public const SpacetimeDB.Internal.CaseConversionPolicy CASE_CONVERSION_POLICY = SpacetimeDB.Internal.CaseConversionPolicy.SnakeCase;
```

### Changes
- Move enum definition from `SpacetimeDB.Internal` to `SpacetimeDB`
namespace in autogen
- Fully qualify all `Internal` references to
`SpacetimeDB.CaseConversionPolicy`
- Codegen source generator accepts both
`SpacetimeDB.CaseConversionPolicy` and
`SpacetimeDB.Internal.CaseConversionPolicy` for backward compatibility
- Updated test fixture and verified snapshots
- All 4 codegen tests pass

---------

Co-authored-by: clockwork-labs-bot <clockwork-labs-bot@users.noreply.github.com>

crates/bindings-csharp/Codegen.Tests/fixtures/explicitnames/Lib.cs

@@ -5,10 +5,7 @@ using SpacetimeDB;
 public static partial class Module
 {
     [SpacetimeDB.Settings]
-    public const SpacetimeDB.Internal.CaseConversionPolicy CASE_CONVERSION_POLICY = SpacetimeDB
-        .Internal
-        .CaseConversionPolicy
-        .SnakeCase;
+    public const CaseConversionPolicy CASE_CONVERSION_POLICY = CaseConversionPolicy.SnakeCase;
 }
 
 [SpacetimeDB.Type]

crates/bindings-csharp/Codegen.Tests/fixtures/explicitnames/snapshots/Module#FFI.verified.cs

@@ -523,7 +523,7 @@ static class ModuleRegistration
                 new SpacetimeDB.ProcedureContext(identity, connectionId, random, time)
         );
         SpacetimeDB.Internal.Module.SetCaseConversionPolicy(
-            SpacetimeDB.Internal.CaseConversionPolicy.SnakeCase
+            SpacetimeDB.CaseConversionPolicy.SnakeCase
         );
         SpacetimeDB.Internal.Module.RegisterExplicitTableName("DemoTable", "canonical_table");
         SpacetimeDB.Internal.Module.RegisterExplicitFunctionName(

crates/bindings-csharp/Codegen/Diag.cs

@@ -245,7 +245,7 @@ internal static class ErrorDescriptor
             group,
             "[SpacetimeDB.Settings] field must be a const CaseConversionPolicy",
             field =>
-                $"Settings field {field.Name} must be declared as 'public const SpacetimeDB.Internal.CaseConversionPolicy ...'.",
+                $"Settings field {field.Name} must be declared as 'public const SpacetimeDB.CaseConversionPolicy ...'.",
             field => field
         );
 

crates/bindings-csharp/Codegen/Module.cs

@@ -61,7 +61,11 @@ record SettingsDeclaration
     public readonly string FullName;
     public readonly string? CaseConversionPolicy;
 
-    private const string CaseConversionPolicyTypeName = "SpacetimeDB.Internal.CaseConversionPolicy";
+    private static readonly string[] CaseConversionPolicyTypeNames =
+    [
+        "SpacetimeDB.CaseConversionPolicy",
+        "SpacetimeDB.Internal.CaseConversionPolicy", // backward compat
+    ];
 
     public SettingsDeclaration(GeneratorAttributeSyntaxContext context, DiagReporter diag)
     {
@@ -73,7 +77,7 @@ record SettingsDeclaration
             diag.Report(ErrorDescriptor.SettingsMustBeConstCaseConversionPolicy, fieldSymbol);
             return;
         }
-        if (fieldSymbol.Type.ToString() != CaseConversionPolicyTypeName)
+        if (!CaseConversionPolicyTypeNames.Contains(fieldSymbol.Type.ToString()))
         {
             diag.Report(ErrorDescriptor.SettingsMustBeConstCaseConversionPolicy, fieldSymbol);
             return;
@@ -1981,7 +1985,7 @@ public class Module : IIncrementalGenerator
                 var settingsRegistration =
                     settings.Array.Length == 1
                     && settings.Array[0].CaseConversionPolicy is { } policyName
-                        ? $"SpacetimeDB.Internal.Module.SetCaseConversionPolicy(SpacetimeDB.Internal.CaseConversionPolicy.{policyName});"
+                        ? $"SpacetimeDB.Internal.Module.SetCaseConversionPolicy(SpacetimeDB.CaseConversionPolicy.{policyName});"
                         : string.Empty;
 
                 var explicitTableRegistrations = string.Join(

crates/bindings-csharp/Runtime/Internal/Autogen/CaseConversionPolicy.g.cs

@@ -5,7 +5,7 @@
 
 using System;
 
-namespace SpacetimeDB.Internal
+namespace SpacetimeDB
 {
     [SpacetimeDB.Type]
     public enum CaseConversionPolicy

crates/bindings-csharp/Runtime/Internal/Autogen/RawModuleDefV10Section.g.cs

@@ -18,7 +18,7 @@ namespace SpacetimeDB.Internal
         System.Collections.Generic.List<RawScheduleDefV10> Schedules,
         System.Collections.Generic.List<RawLifeCycleReducerDefV10> LifeCycleReducers,
         System.Collections.Generic.List<RawRowLevelSecurityDefV9> RowLevelSecurity,
-        CaseConversionPolicy CaseConversionPolicy,
+        SpacetimeDB.CaseConversionPolicy CaseConversionPolicy,
         ExplicitNames ExplicitNames
     )>;
 }

crates/bindings-csharp/Runtime/Internal/Module.cs

@@ -21,7 +21,7 @@ partial class RawModuleDefV10
     private readonly Dictionary<string, List<RawColumnDefaultValueV10>> defaultValuesByTable =
         new(StringComparer.Ordinal);
 
-    private CaseConversionPolicy? caseConversionPolicy = null;
+    private SpacetimeDB.CaseConversionPolicy? caseConversionPolicy = null;
     private readonly List<ExplicitNameEntry> explicitNames = [];
 
     // Note: this intends to generate a valid identifier, but it's not guaranteed to be unique as it's not proper mangling.
@@ -89,7 +89,7 @@ partial class RawModuleDefV10
         defaults.Add(new RawColumnDefaultValueV10(colId, new List<byte>(value)));
     }
 
-    internal void SetCaseConversionPolicy(CaseConversionPolicy policy) =>
+    internal void SetCaseConversionPolicy(SpacetimeDB.CaseConversionPolicy policy) =>
         caseConversionPolicy = policy;
 
     internal void RegisterExplicitTableName(string sourceName, string canonicalName) =>
@@ -332,7 +332,7 @@ public static class Module
     public static void RegisterTableDefaultValue(string table, ushort colId, byte[] value) =>
         moduleDef.RegisterTableDefaultValue(table, colId, value);
 
-    public static void SetCaseConversionPolicy(CaseConversionPolicy policy) =>
+    public static void SetCaseConversionPolicy(SpacetimeDB.CaseConversionPolicy policy) =>
         moduleDef.SetCaseConversionPolicy(policy);
 
     public static void RegisterExplicitTableName(string sourceName, string canonicalName) =>

crates/codegen/examples/regen-csharp-moduledef.rs

@@ -54,6 +54,23 @@ fn main() -> anyhow::Result<()> {
             return Ok(());
         }
 
+        // CaseConversionPolicy is part of the public API — move it to
+        // the SpacetimeDB namespace so users don't have to write
+        // SpacetimeDB.Internal.CaseConversionPolicy.
+        let code = if filename == "CaseConversionPolicy.g.cs" {
+            regex_replace!(&code, r"namespace SpacetimeDB\.Internal", "namespace SpacetimeDB")
+        } else {
+            // In other autogen files, qualify the type name in type position
+            // (before a space+identifier) so it resolves after the namespace move.
+            // The pattern "CaseConversionPolicy CaseConversionPolicy" becomes
+            // "SpacetimeDB.CaseConversionPolicy CaseConversionPolicy".
+            regex_replace!(
+                &code,
+                r"\bCaseConversionPolicy(\s+)CaseConversionPolicy\b",
+                "SpacetimeDB.CaseConversionPolicy${1}CaseConversionPolicy"
+            )
+        };
+
         let code = regex_replace!(&code, r"\bAlgebraicType\b", "SpacetimeDB.BSATN.$0");
         let code = regex_replace!(
             &code,