fix: C# NamespaceDoc emitted to wrong location

packages/@scope/jsii-calc-lib/lib/submodule/README.md

@@ -0,0 +1,3 @@
+# Submodule Readme
+
+This is a submodule readme.

packages/@scope/jsii-calc-lib/test/assembly.jsii

@@ -95,6 +95,9 @@
         "filename": "lib/index.ts",
         "line": 130
       },
+      "readme": {
+        "markdown": "# Submodule Readme\n\nThis is a submodule readme.\n"
+      },
       "targets": {
         "dotnet": {
           "namespace": "Amazon.JSII.Tests.CustomSubmoduleName"
@@ -948,5 +951,5 @@
     }
   },
   "version": "0.0.0",
-  "fingerprint": "LN1bs46m2O4aR6AhHvi6UDh/f90EoUT3n5apMPzr9+c="
+  "fingerprint": "fCLOsQQLslSg+W8rn7XDZ1RSenH5QeaoTna+j7o+URc="
 }

packages/jsii-calc/test/assembly.jsii

@@ -95,10 +95,6 @@
     "@scope/jsii-calc-lib": {
       "submodules": {
         "@scope/jsii-calc-lib.submodule": {
-          "locationInModule": {
-            "filename": "lib/index.ts",
-            "line": 130
-          },
           "targets": {
             "dotnet": {
               "namespace": "Amazon.JSII.Tests.CustomSubmoduleName"
@@ -16779,5 +16775,5 @@
     }
   },
   "version": "3.20.120",
-  "fingerprint": "XZczlgiEPAQC/n86Dqa40vixNH4txnPoyuF1Q+jR6I0="
+  "fingerprint": "WpcHNV2L+v3B7Ou+8xsRMzye4rf1U+SURQA97A3JT6g="
 }

packages/jsii-pacmak/lib/targets/dotnet/dotnetgenerator.ts

@@ -159,7 +159,9 @@ export class DotNetGenerator extends Generator {
       const dotnetNs = this.typeresolver.resolveNamespace(
         this.assembly,
         this.assembly.name,
-        jsiiNs,
+        // Strip the `${assmName}.` prefix here, as the "assembly-relative" NS
+        // is expected by `this.typeResolver.resovleNamespace`.
+        jsiiNs.substr(this.assembly.name.length + 1),
       );
       this.emitNamespaceDocs(dotnetNs, jsiiNs, submodule);
     }

packages/jsii/lib/assembler.ts

@@ -3102,17 +3102,42 @@ function noEmptyDict<T>(
 function toDependencyClosure(assemblies: readonly spec.Assembly[]): {
   [name: string]: spec.AssemblyConfiguration;
 } {
-  const result: { [name: string]: spec.AssemblyTargets } = {};
+  const result: { [name: string]: spec.AssemblyConfiguration } = {};
   for (const assembly of assemblies) {
     if (!assembly.targets) {
       continue;
     }
     result[assembly.name] = {
-      submodules: assembly.submodules,
+      submodules: cleanUp(assembly.submodules),
       targets: assembly.targets,
     };
   }
   return result;
+
+  /**
+   * Removes unneeded fields from the entries part of the `dependencyClosure`
+   * property. Fields such as `readme` are not necessary and can bloat up the
+   * assembly object.
+   *
+   * This removes the `readme` and `locationInModule` fields from the submodule
+   * descriptios if present.
+   *
+   * @param submodules the submodules list to clean up.
+   *
+   * @returns the cleaned up submodules list.
+   */
+  function cleanUp(
+    submodules: spec.Assembly['submodules'],
+  ): spec.AssemblyConfiguration['submodules'] {
+    if (submodules == null) {
+      return submodules;
+    }
+    const result: spec.Assembly['submodules'] = {};
+    for (const [fqn, desc] of Object.entries(submodules)) {
+      result[fqn] = { ...desc, locationInModule: undefined, readme: undefined };
+    }
+    return result;
+  }
 }
 
 function toSubmoduleDeclarations(