fix: resolve bundled public surfaces from packaged dist

src/plugins/public-surface-runtime.test.ts

@@ -70,6 +70,25 @@ describe("bundled plugin public surface runtime", () => {
     ).toBe(sourceModulePath);
   });
 
+  it("falls back from an incomplete package dist-runtime override to packaged dist", () => {
+    const packageRoot = createTempDir();
+    const distModulePath = path.join(packageRoot, "dist", "extensions", "demo", "api.js");
+    fs.mkdirSync(path.dirname(distModulePath), { recursive: true });
+    fs.writeFileSync(distModulePath, "export const marker = 'dist';\n", "utf8");
+
+    const runtimeBundledPluginsDir = path.join(packageRoot, "dist-runtime", "extensions");
+    fs.mkdirSync(path.join(runtimeBundledPluginsDir, "demo"), { recursive: true });
+
+    expect(
+      resolveBundledPluginPublicSurfacePath({
+        rootDir: packageRoot,
+        bundledPluginsDir: runtimeBundledPluginsDir,
+        dirName: "demo",
+        artifactBasename: "api.js",
+      }),
+    ).toBe(distModulePath);
+  });
+
   it("allows plugin-local nested artifact paths", () => {
     expect(normalizeBundledPluginArtifactSubpath("src/outbound-adapter.js")).toBe(
       "src/outbound-adapter.js",

src/plugins/public-surface-runtime.ts

@@ -70,7 +70,7 @@ export function resolveBundledPluginSourcePublicSurfacePath(params: {
   return null;
 }
 
-function resolvePackageSourceFallbackForBundledDir(params: {
+function resolvePackageFallbackForBundledDir(params: {
   rootDir: string;
   bundledPluginsDir: string;
   dirName: string;
@@ -85,6 +85,15 @@ function resolvePackageSourceFallbackForBundledDir(params: {
   if (!packageBundledDirs.includes(normalizedBundledDir)) {
     return null;
   }
+  for (const packageBundledDir of packageBundledDirs) {
+    if (packageBundledDir === normalizedBundledDir) {
+      continue;
+    }
+    const builtCandidate = path.join(packageBundledDir, params.dirName, params.artifactBasename);
+    if (fs.existsSync(builtCandidate)) {
+      return builtCandidate;
+    }
+  }
   return resolveBundledPluginSourcePublicSurfacePath({
     sourceRoot: path.join(normalizedRootDir, "extensions"),
     dirName: params.dirName,
@@ -116,7 +125,7 @@ export function resolveBundledPluginPublicSurfacePath(params: {
         dirName,
         artifactBasename,
       }) ??
-      resolvePackageSourceFallbackForBundledDir({
+      resolvePackageFallbackForBundledDir({
         rootDir: params.rootDir,
         bundledPluginsDir: explicitBundledPluginsDir,
         dirName,