feat(core): add embedded v2 session runtime and tool foundation (#30632)

packages/core/test/fixture/tmpdir.ts

@@ -3,11 +3,22 @@ import { tmpdir as osTmpdir } from "os"
 import path from "path"
 
 export const tmpdir = async () => {
-  const dir = await fs.mkdtemp(path.join(osTmpdir(), "opencode-core-test-"))
+  const dir = await fs.realpath(await fs.mkdtemp(path.join(osTmpdir(), "opencode-core-test-")))
   return {
     path: dir,
     async [Symbol.asyncDispose]() {
-      await fs.rm(dir, { recursive: true, force: true })
+      await remove(dir)
     },
   }
 }
+
+async function remove(dir: string, retries = 10): Promise<void> {
+  try {
+    await fs.rm(dir, { recursive: true, force: true })
+  } catch (error) {
+    if (retries === 0 || !error || typeof error !== "object" || !("code" in error) || error.code !== "EBUSY")
+      throw error
+    await Bun.sleep(100)
+    return remove(dir, retries - 1)
+  }
+}