feat(script): add bun test summary detector

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

script/assert-test-summary.ts

@@ -0,0 +1,25 @@
+/// <reference types="bun-types" />
+
+export const bunTestSummaryPattern = /^Ran [1-9][0-9]* tests across [1-9][0-9]* files?\./m
+
+export function hasBunTestSummary(output: string): boolean {
+  return bunTestSummaryPattern.test(output)
+}
+
+async function assertTestSummaryFromLog(logPath: string): Promise<void> {
+  const output = await Bun.file(logPath).text()
+
+  if (!hasBunTestSummary(output)) {
+    throw new Error(`Missing bun test completion summary in ${logPath}`)
+  }
+}
+
+if (import.meta.main) {
+  const [logPath] = process.argv.slice(2)
+
+  if (!logPath) {
+    throw new Error("Usage: bun run script/assert-test-summary.ts <bun-test-log-path>")
+  }
+
+  await assertTestSummaryFromLog(logPath)
+}