ci: build root release metadata without tsdown entry

Author: Shaw

.github/workflows/release-electrobun.yml

@@ -234,8 +234,40 @@ jobs:
 
       - name: Build core dist (server bundle)
         run: |
-          bunx tsdown
-          echo '{"type":"module"}' > dist/package.json
+          node --input-type=module <<'NODE'
+          import fs from "node:fs";
+          import path from "node:path";
+
+          const root = process.cwd();
+          const hasRootTsdownEntry =
+            fs.existsSync(path.join(root, "tsdown.config.ts")) ||
+            fs.existsSync(path.join(root, "tsdown.config.mts")) ||
+            fs.existsSync(path.join(root, "tsdown.config.js")) ||
+            fs.existsSync(path.join(root, "src", "index.ts"));
+
+          if (hasRootTsdownEntry) {
+            const { spawnSync } = await import("node:child_process");
+            const result = spawnSync("bunx", ["tsdown", "--fail-on-warn", "false"], {
+              cwd: root,
+              stdio: "inherit",
+              shell: process.platform === "win32",
+            });
+            process.exit(result.status ?? 1);
+          }
+
+          const entryTarget = "../packages/app-core/src/entry.ts";
+          const entrySource = [
+            "// auto-generated by release-electrobun.yml",
+            "// Standalone elizaOS checkouts do not have a root tsdown entry.",
+            `export * from ${JSON.stringify(entryTarget)};`,
+            "",
+          ].join("\n");
+
+          fs.mkdirSync(path.join(root, "dist"), { recursive: true });
+          fs.writeFileSync(path.join(root, "dist", "entry.js"), entrySource);
+          fs.writeFileSync(path.join(root, "dist", "index.js"), entrySource);
+          fs.writeFileSync(path.join(root, "dist", "package.json"), '{"type":"module"}\n');
+          NODE
           node --import tsx packages/scripts/write-build-info.ts
 
       - name: Run heavy E2E regression suite