fix(assets): strict template rendering and deterministic sort

Address review feedback on the AssetManager:
- Handlebars strict mode: a template referencing an undefined variable
  now throws instead of silently rendering an empty string into a
  generated project file.
- drop the speculative `docker` branch from the ignore-template rename;
  only git/npm ignores ship as assets today.
- use code-unit ordering for embedded files so both list paths
  (embedded and filesystem) sort identically and deterministically.

Author: tejaskash

src/assetManager/AssetManager.test.ts

@@ -74,6 +74,19 @@ describe("AssetManager", () => {
     );
   });
 
+  test("throws on a template referencing an undefined variable", async () => {
+    const root = await makeTempDirectory();
+    const source = join(root, "assets", "cdk");
+    const destination = join(root, "output");
+
+    await mkdir(source, { recursive: true });
+    await Bun.write(join(source, "README.md"), "Hello {{projectName}}");
+
+    await expect(
+      new AssetManager([], join(root, "assets")).render("cdk", destination),
+    ).rejects.toThrow(/projectName/);
+  });
+
   test("rejects an embedded path that escapes the destination", async () => {
     const root = await makeTempDirectory();
     const destination = join(root, "output");

src/assetManager/AssetManager.ts

@@ -42,7 +42,10 @@ export class AssetManager {
     const resolvedDestination = resolve(destination);
     for (const file of assetFiles) {
       const outputPath = this.resolveOutputPath(resolvedDestination, file.relativePath);
-      const rendered = this.handlebars.compile(await file.text(), { noEscape: true })(variables);
+      const rendered = this.handlebars.compile(await file.text(), {
+        noEscape: true,
+        strict: true,
+      })(variables);
 
       await mkdir(dirname(outputPath), { recursive: true });
       await atomicWrite(outputPath, rendered);
@@ -81,7 +84,7 @@ export class AssetManager {
         relativePath: file.name.slice(prefix.length),
         text: () => file.text(),
       }))
-      .sort((a, b) => a.relativePath.localeCompare(b.relativePath));
+      .sort((a, b) => (a.relativePath < b.relativePath ? -1 : 1));
   }
 
   private resolveOutputPath(resolvedDestination: string, relativePath: string): string {
@@ -102,7 +105,7 @@ export class AssetManager {
 
   private resolveTemplateName(relativePath: string): string {
     const filename = basename(relativePath);
-    const ignore = filename.match(/^(docker|git|npm)ignore\.template$/);
+    const ignore = filename.match(/^(git|npm)ignore\.template$/);
     return join(dirname(relativePath), ignore ? `.${ignore[1]}ignore` : filename);
   }
 }