diff --git a/.agents/skills/fusion-cli/SKILL.md b/.agents/skills/fusion-cli/SKILL.md
index 01a4024..97cba71 100644
--- a/.agents/skills/fusion-cli/SKILL.md
+++ b/.agents/skills/fusion-cli/SKILL.md
@@ -152,6 +152,8 @@ C# (`asp-core`): `main.cs`, `*.csproj` (`net10.0`), `[Route]` / `[HttpGet]`.
 }
 ```
 
+For TypeScript apps, `commands.run` must invoke a TypeScript runner (e.g. `npx tsx main.ts`); plain `node main.ts` fails with `ERR_UNKNOWN_FILE_EXTENSION`. With `reload: true`, the framework reloader forwards `process.execArgv` so tsx loaders survive child respawns. Older CLI scaffolds that still emit `node main.ts` should be updated in **fusion-tool** (`environment.rs` / `structure.rs`).
+
 `FUSION_ENV` selects `fusion.<env>.json` (default `dev`). Unresolved `HOST` placeholders must not crash listen — framework resolves safe defaults.
 
 ## Compatibility duties (framework ↔ CLI)
diff --git a/Cargo.lock b/Cargo.lock
index fbd8e55..e5ea81f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -168,7 +168,7 @@ checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
 
 [[package]]
 name = "fusion-core"
-version = "2.0.0"
+version = "2.0.1"
 dependencies = [
  "bytes",
  "console",
@@ -184,7 +184,7 @@ dependencies = [
 
 [[package]]
 name = "fusion-ffi"
-version = "2.0.0"
+version = "2.0.1"
 dependencies = [
  "bytes",
  "fusion-core",
@@ -194,7 +194,7 @@ dependencies = [
 
 [[package]]
 name = "fusion-node"
-version = "2.0.0"
+version = "2.0.1"
 dependencies = [
  "fusion-core",
  "napi",
@@ -207,7 +207,7 @@ dependencies = [
 
 [[package]]
 name = "fusion-py"
-version = "2.0.0"
+version = "2.0.1"
 dependencies = [
  "bytes",
  "fusion-core",
diff --git a/Cargo.toml b/Cargo.toml
index 578a400..d1f9dfa 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,7 +8,7 @@ members = [
 ]
 
 [workspace.package]
-version = "2.0.0"
+version = "2.0.1"
 edition = "2024"
 
 [workspace.dependencies]
diff --git a/bindings/csharp/FusionFramework/FusionBaseApi.cs b/bindings/csharp/FusionFramework/FusionBaseApi.cs
index c2f25fc..69c0cf1 100644
--- a/bindings/csharp/FusionFramework/FusionBaseApi.cs
+++ b/bindings/csharp/FusionFramework/FusionBaseApi.cs
@@ -56,8 +56,11 @@ public object Response(object? body = null, int status = 200, IDictionary<string
                 _ => JsonSerializer.SerializeToNode(body),
             },
         };
+        // Keep Dictionary<string, string> so middleware MergeResponseHeaders can
+        // preserve content-type (e.g. text/html from templates). Boxing as object
+        // made the typed merge check fail and dropped headers before the browser.
         if (headers is { Count: > 0 })
-            envelope["headers"] = headers.ToDictionary(kv => kv.Key, kv => (object)kv.Value);
+            envelope["headers"] = new Dictionary<string, string>(headers, StringComparer.OrdinalIgnoreCase);
         return envelope;
     }
 
diff --git a/bindings/csharp/FusionFramework/FusionFramework.csproj b/bindings/csharp/FusionFramework/FusionFramework.csproj
index 5b84461..c5e4eb8 100644
--- a/bindings/csharp/FusionFramework/FusionFramework.csproj
+++ b/bindings/csharp/FusionFramework/FusionFramework.csproj
@@ -7,7 +7,7 @@
     <RootNamespace>FusionFramework</RootNamespace>
     <AssemblyName>FusionFramework</AssemblyName>
     <PackageId>Fusion-Framework</PackageId>
-    <Version>2.0.0</Version>
+    <Version>2.0.1</Version>
     <Authors>CipherUnits</Authors>
     <Company>CipherUnits</Company>
     <Description>Fusion Framework managed bindings (C#) over fusion-ffi / fusion-core</Description>
@@ -28,6 +28,14 @@
   <ItemGroup>
     <None Include="README.md" Pack="true" PackagePath="/" />
     <Content Include="runtimes/**" Pack="true" PackagePath="runtimes" CopyToOutputDirectory="PreserveNewest" />
-    <Content Include="static/swagger-ui/**" Pack="true" PackagePath="static/swagger-ui/%(RecursiveDir)%(Filename)%(Extension)" CopyToOutputDirectory="PreserveNewest" />
+    <!-- Disk copy for ProjectReference / local builds; also pack beside the DLL for NuGet. -->
+    <Content Include="static/swagger-ui/**"
+             Pack="true"
+             PackagePath="lib/$(TargetFramework)/static/swagger-ui/%(RecursiveDir)%(Filename)%(Extension)"
+             CopyToOutputDirectory="PreserveNewest" />
+    <!-- Embedded so NuGet consumers still serve Swagger UI without copy-to-output. -->
+    <EmbeddedResource Include="static/swagger-ui/swagger-ui-bundle.js" />
+    <EmbeddedResource Include="static/swagger-ui/swagger-ui-standalone-preset.js" />
+    <EmbeddedResource Include="static/swagger-ui/swagger-ui.css" />
   </ItemGroup>
 </Project>
diff --git a/bindings/csharp/FusionFramework/Header.cs b/bindings/csharp/FusionFramework/Header.cs
index ac0f64e..2169c93 100644
--- a/bindings/csharp/FusionFramework/Header.cs
+++ b/bindings/csharp/FusionFramework/Header.cs
@@ -90,7 +90,7 @@ public static Dictionary<string, string> Fingerprint()
             {
                 ["X-Powered-By"] = "Fusion Framework",
                 ["X-Framework"] = "Fusion",
-                ["X-Fusion-Version"] = "2.0.0",
+                ["X-Fusion-Version"] = "2.0.1",
             };
         }
     }
diff --git a/bindings/csharp/FusionFramework/Middleware.cs b/bindings/csharp/FusionFramework/Middleware.cs
index 6978304..cde4cfc 100644
--- a/bindings/csharp/FusionFramework/Middleware.cs
+++ b/bindings/csharp/FusionFramework/Middleware.cs
@@ -489,15 +489,20 @@ public static FusionMiddleware FrameworkHeaders()
         };
     }
 
+    /// <summary>
+    /// Merge middleware headers into a response envelope. Existing headers win on key conflict.
+    /// Accepts string or object-valued header maps so template content-type is not dropped.
+    /// </summary>
     internal static object MergeResponseHeaders(object? result, IReadOnlyDictionary<string, string> extra)
     {
         if (result is Dictionary<string, object?> dict)
         {
             var headers = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
             foreach (var kv in extra) headers[kv.Key] = kv.Value;
-            if (dict.TryGetValue("headers", out var existing) && existing is IDictionary<string, string> map)
+            if (dict.TryGetValue("headers", out var existing) && existing is not null)
             {
-                foreach (var kv in map) headers[kv.Key] = kv.Value;
+                foreach (var kv in CoerceHeaderMap(existing))
+                    headers[kv.Key] = kv.Value;
             }
             dict["headers"] = headers;
             return dict;
@@ -511,6 +516,46 @@ internal static object MergeResponseHeaders(object? result, IReadOnlyDictionary<
         };
     }
 
+    /// <summary>Normalize envelope headers from string or object dictionaries to string pairs.</summary>
+    static IEnumerable<KeyValuePair<string, string>> CoerceHeaderMap(object existing)
+    {
+        if (existing is IDictionary<string, string> map)
+        {
+            foreach (var kv in map)
+                yield return kv;
+            yield break;
+        }
+
+        if (existing is IDictionary<string, object?> objNullable)
+        {
+            foreach (var kv in objNullable)
+            {
+                if (kv.Value is null) continue;
+                yield return new KeyValuePair<string, string>(kv.Key, kv.Value.ToString() ?? "");
+            }
+            yield break;
+        }
+
+        if (existing is IDictionary<string, object> objMap)
+        {
+            foreach (var kv in objMap)
+            {
+                if (kv.Value is null) continue;
+                yield return new KeyValuePair<string, string>(kv.Key, kv.Value.ToString() ?? "");
+            }
+            yield break;
+        }
+
+        if (existing is System.Collections.IDictionary idict)
+        {
+            foreach (System.Collections.DictionaryEntry entry in idict)
+            {
+                if (entry.Key is not string key || entry.Value is null) continue;
+                yield return new KeyValuePair<string, string>(key, entry.Value.ToString() ?? "");
+            }
+        }
+    }
+
     static object Error(int status, string detail) =>
         new Dictionary<string, object?>
         {
diff --git a/bindings/csharp/FusionFramework/Status.cs b/bindings/csharp/FusionFramework/Status.cs
index 61a0f9e..6f5a819 100644
--- a/bindings/csharp/FusionFramework/Status.cs
+++ b/bindings/csharp/FusionFramework/Status.cs
@@ -85,9 +85,10 @@ public object ToResponse()
             ["body"] = body is string or JsonNode
                 ? body
                 : JsonSerializer.SerializeToNode(body),
+            // Same string-typed map as FusionBaseApi.Response so header merges keep values.
             ["headers"] = Headers.Count == 0
                 ? null
-                : Headers.ToDictionary(kv => kv.Key, kv => (object)kv.Value),
+                : new Dictionary<string, string>(Headers, StringComparer.OrdinalIgnoreCase),
         };
     }
 }
diff --git a/bindings/csharp/FusionFramework/Swagger.cs b/bindings/csharp/FusionFramework/Swagger.cs
index 394daea..a6f0216 100644
--- a/bindings/csharp/FusionFramework/Swagger.cs
+++ b/bindings/csharp/FusionFramework/Swagger.cs
@@ -464,7 +464,7 @@ static string UiHtml(SwaggerConfig swagger, string openapiUrl, string? primaryNa
     </style>
 """
             : "";
-        var standalone = needsStandalone && File.Exists(Path.Combine(AssetsDirectory(), "swagger-ui-standalone-preset.js"))
+        var standalone = needsStandalone && TryLoadSwaggerAsset("swagger-ui-standalone-preset.js") is not null
             ? $"""<script src="{AssetUrl(swagger.Path, "swagger-ui-standalone-preset.js")}"></script>"""
             : "";
         var navbarJs = needsStandalone ? "true" : "false";
@@ -514,6 +514,7 @@ static readonly (string Name, string ContentType)[] SwaggerAssetFiles =
         ("swagger-ui.css", "text/css; charset=utf-8"),
     ];
 
+    /// <summary>Directory next to the assembly (ProjectReference / copy-to-output layouts).</summary>
     static string AssetsDirectory()
     {
         var asmDir = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
@@ -524,15 +525,38 @@ static string AssetsDirectory()
 
     static string AssetUrl(string prefix, string name) => $"{prefix}/assets/{name}";
 
+    /// <summary>
+    /// Load a Swagger UI asset from embedded resources (NuGet) or disk next to the DLL.
+    /// SDK embeds folder segments with '_' (static/swagger-ui → static.swagger_ui).
+    /// </summary>
+    internal static string? TryLoadSwaggerAsset(string name)
+    {
+        var asm = Assembly.GetExecutingAssembly();
+        var resourceName = asm.GetManifestResourceNames()
+            .FirstOrDefault(n =>
+                n.EndsWith($".{name}", StringComparison.OrdinalIgnoreCase)
+                || string.Equals(n, name, StringComparison.OrdinalIgnoreCase));
+        if (resourceName is not null)
+        {
+            using var stream = asm.GetManifestResourceStream(resourceName);
+            if (stream is not null)
+            {
+                using var reader = new StreamReader(stream);
+                return reader.ReadToEnd();
+            }
+        }
+
+        var filePath = Path.Combine(AssetsDirectory(), name);
+        return File.Exists(filePath) ? File.ReadAllText(filePath) : null;
+    }
+
     static void MountAssets(FusionApp app, string prefix)
     {
-        var dir = AssetsDirectory();
         foreach (var (name, contentType) in SwaggerAssetFiles)
         {
-            var filePath = Path.Combine(dir, name);
-            if (!File.Exists(filePath))
+            var body = TryLoadSwaggerAsset(name);
+            if (body is null)
                 continue;
-            var body = File.ReadAllText(filePath);
             app.AddRawRoute("GET", $"{prefix}/assets/{name}", () => new Dictionary<string, object?>
             {
                 ["status"] = 200,
diff --git a/crates/fusion-node/index.js b/crates/fusion-node/index.js
index a639f84..4134794 100644
--- a/crates/fusion-node/index.js
+++ b/crates/fusion-node/index.js
@@ -135,7 +135,7 @@ header.fingerprint = () =>
     : {
         'X-Powered-By': 'Fusion Framework',
         'X-Framework': 'Fusion',
-        ['X-Fusion-Version']: '2.0.0',
+        ['X-Fusion-Version']: '2.0.1',
       }
 
 function isThenable(value) {
@@ -1667,6 +1667,15 @@ function snapshotMtimes(files) {
   return map
 }
 
+/**
+ * Argv for the reload child process.
+ * Forwards `execArgv` so loaders like tsx (`--import` / `--require`) survive
+ * `spawn(process.execPath, …)` — unlike `fork()`, spawn does not inherit them.
+ */
+function reloadChildArgv(execArgv = process.execArgv, argv = process.argv) {
+  return [...execArgv, ...argv.slice(1)]
+}
+
 async function runWithReloader({ watchDirs } = {}) {
   const roots = watchDirs?.length ? watchDirs : [process.cwd()]
   console.log(`fusion: reload enabled (watching ${roots.join(', ')})`)
@@ -1674,7 +1683,7 @@ async function runWithReloader({ watchDirs } = {}) {
   let child = null
   const spawnChild = () => {
     const env = { ...process.env, FUSION_RELOAD_CHILD: '1' }
-    child = spawn(process.execPath, process.argv.slice(1), {
+    child = spawn(process.execPath, reloadChildArgv(), {
       env,
       stdio: 'inherit',
     })
@@ -1989,6 +1998,7 @@ module.exports = {
   openapiSpec,
   routeVersions,
   hasUnversionedRoutes,
+  reloadChildArgv,
   getHttpMethods: () => HTTP_METHODS,
   apiResourceNameJs: native.apiResourceNameJs,
   resolveRoutePathJs: native.resolveRoutePathJs,
diff --git a/crates/fusion-node/package.json b/crates/fusion-node/package.json
index 2e5e612..11a8f1f 100644
--- a/crates/fusion-node/package.json
+++ b/crates/fusion-node/package.json
@@ -1,6 +1,6 @@
 {
   "name": "fusion-framework",
-  "version": "2.0.0",
+  "version": "2.0.1",
   "description": "Class-based HTTP framework for Node.js, powered by a shared Rust core via N-API",
   "keywords": [
     "fusion",
diff --git a/crates/fusion-py/pyproject.toml b/crates/fusion-py/pyproject.toml
index 15b8f93..0689a3d 100644
--- a/crates/fusion-py/pyproject.toml
+++ b/crates/fusion-py/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "maturin"
 
 [project]
 name = "fusion-framework"
-version = "2.0.0"
+version = "2.0.1"
 description = "Class-based HTTP framework for Python, powered by a shared Rust core"
 readme = "README.md"
 requires-python = ">=3.9"
diff --git a/crates/fusion-py/python/fusion_framework/middleware.py b/crates/fusion-py/python/fusion_framework/middleware.py
index 2c31a78..abbd2f9 100644
--- a/crates/fusion-py/python/fusion_framework/middleware.py
+++ b/crates/fusion-py/python/fusion_framework/middleware.py
@@ -258,13 +258,13 @@ def framework_headers() -> Middleware:
                     hdr, "FRAMEWORK_POWERED_BY", "Fusion Framework"
                 ),
                 getattr(hdr, "X_FRAMEWORK", "X-Framework"): getattr(hdr, "FRAMEWORK_ID", "Fusion"),
-                getattr(hdr, "X_FUSION_VERSION", "X-Fusion-Version"): "2.0.0",
+                getattr(hdr, "X_FUSION_VERSION", "X-Fusion-Version"): "2.0.1",
             }
         except Exception:
             extra = {
                 "X-Powered-By": "Fusion Framework",
                 "X-Framework": "Fusion",
-                "X-Fusion-Version": "2.0.0",
+                "X-Fusion-Version": "2.0.1",
             }
 
     def middleware(request: RequestDict, call_next: Callable[[RequestDict], Any]) -> Any:
diff --git a/tests/csharp/FusionFramework.Tests/MiddlewareTests.cs b/tests/csharp/FusionFramework.Tests/MiddlewareTests.cs
index 97f4d4c..9039852 100644
--- a/tests/csharp/FusionFramework.Tests/MiddlewareTests.cs
+++ b/tests/csharp/FusionFramework.Tests/MiddlewareTests.cs
@@ -106,4 +106,51 @@ public void StaticFiles_serves_asset_under_prefix()
             dir.Delete(recursive: true);
         }
     }
+
+    [Fact]
+    public void SecurityHeaders_preserves_html_content_type_from_response()
+    {
+        // Template HtmlResponse uses Response(..., headers) then SecurityHeaders merges;
+        // content-type must survive so the browser renders HTML instead of raw source.
+        var api = new HeaderProbeApi();
+        var envelope = api.Response(
+            "<html><body>ok</body></html>",
+            200,
+            new Dictionary<string, string> { ["content-type"] = "text/html; charset=utf-8" });
+
+        var result = Middleware.RunChain(
+            new FusionRequest { Method = "GET", Path = "/", Headers = new Dictionary<string, string>() },
+            new[] { Middleware.SecurityHeaders() },
+            _ => envelope) as Dictionary<string, object?>;
+
+        Assert.NotNull(result);
+        var headers = Assert.IsType<Dictionary<string, string>>(result["headers"]);
+        Assert.StartsWith("text/html", headers["content-type"], StringComparison.OrdinalIgnoreCase);
+        Assert.True(headers.ContainsKey("X-Content-Type-Options"));
+    }
+
+    [Fact]
+    public void MergeResponseHeaders_keeps_object_boxed_content_type()
+    {
+        // Defensive path: older envelopes boxed header values as object.
+        var result = Middleware.MergeResponseHeaders(
+            new Dictionary<string, object?>
+            {
+                ["status"] = 200,
+                ["body"] = "<html/>",
+                ["headers"] = new Dictionary<string, object>
+                {
+                    ["content-type"] = "text/html; charset=utf-8",
+                },
+            },
+            new Dictionary<string, string> { ["X-Content-Type-Options"] = "nosniff" })
+            as Dictionary<string, object?>;
+
+        Assert.NotNull(result);
+        var headers = Assert.IsType<Dictionary<string, string>>(result["headers"]);
+        Assert.Equal("text/html; charset=utf-8", headers["content-type"]);
+        Assert.Equal("nosniff", headers["X-Content-Type-Options"]);
+    }
+
+    sealed class HeaderProbeApi : FusionBaseApi;
 }
diff --git a/tests/csharp/FusionFramework.Tests/RouteTests.cs b/tests/csharp/FusionFramework.Tests/RouteTests.cs
index 2957579..a67c876 100644
--- a/tests/csharp/FusionFramework.Tests/RouteTests.cs
+++ b/tests/csharp/FusionFramework.Tests/RouteTests.cs
@@ -52,6 +52,22 @@ public void Template_routes_are_omitted_from_openapi()
         Assert.True(v1["paths"]!.AsObject().ContainsKey("/v1/api/product"));
     }
 
+    [Fact]
+    public void Swagger_ui_assets_load_from_embedded_resources()
+    {
+        var css = SwaggerDocs.TryLoadSwaggerAsset("swagger-ui.css");
+        var bundle = SwaggerDocs.TryLoadSwaggerAsset("swagger-ui-bundle.js");
+        Assert.False(string.IsNullOrEmpty(css));
+        Assert.False(string.IsNullOrEmpty(bundle));
+        Assert.Contains("SwaggerUIBundle", bundle, StringComparison.Ordinal);
+
+        // Prefer the embedded stream (NuGet path), not only CopyToOutputDirectory files.
+        var asm = typeof(SwaggerDocs).Assembly;
+        Assert.Contains(
+            asm.GetManifestResourceNames(),
+            n => n.EndsWith(".swagger-ui.css", StringComparison.OrdinalIgnoreCase));
+    }
+
     [Route("/api/[module]")]
     sealed class ProductModule : FusionBaseApi
     {
diff --git a/tests/node/unit/bindings.test.js b/tests/node/unit/bindings.test.js
index 34368b2..161a9ee 100644
--- a/tests/node/unit/bindings.test.js
+++ b/tests/node/unit/bindings.test.js
@@ -166,3 +166,14 @@ describe('middleware', () => {
     assert.equal(headers['content-type'], 'image/png')
   })
 })
+
+describe('reload child argv', () => {
+  it('forwards execArgv so tsx loaders survive spawn', () => {
+    const { reloadChildArgv } = fusion
+    const argv = reloadChildArgv(
+      ['--import', 'file:///tsx/loader.mjs'],
+      ['/usr/bin/node', 'main.ts'],
+    )
+    assert.deepEqual(argv, ['--import', 'file:///tsx/loader.mjs', 'main.ts'])
+  })
+})