fix(ultrawork): handle bun:sqlite import failure directly

Use the lazy bun:sqlite importer inside the deferred override microtask and keep the unavailable-runtime test on the rejected-import path.

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

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

src/plugin/ultrawork-db-model-override.bun-sqlite-unavailable.test.ts

@@ -1,9 +1,9 @@
-import { afterEach, beforeEach, describe, expect, mock, spyOn, test } from "bun:test"
-import * as sharedModule from "../shared"
+import { afterEach, beforeEach, describe, expect, spyOn, test } from "bun:test"
+import * as loggerModule from "../shared/logger"
 import {
   scheduleDeferredModelOverride,
-  __setBunSqliteImporterForTesting,
   __resetBunSqliteImporterForTesting,
+  __setBunSqliteImporterForTesting,
 } from "./ultrawork-db-model-override"
 
 function flushMicrotasks(depth: number): Promise<void> {
@@ -25,22 +25,22 @@ describe("scheduleDeferredModelOverride bun:sqlite unavailable", () => {
   let logCalls: Array<[string, Record<string, unknown>?]> = []
 
   beforeEach(() => {
-    // Simulate non-Bun runtime (Node/Electron): bun:sqlite import returns null
-    __setBunSqliteImporterForTesting(async () => null)
-
-    spyOn(sharedModule, "log").mockImplementation((message: string, metadata?: Record<string, unknown>) => {
+    spyOn(loggerModule, "log").mockImplementation((message: string, metadata?: Record<string, unknown>) => {
       logCalls.push([message, metadata])
     })
   })
 
   afterEach(() => {
     __resetBunSqliteImporterForTesting()
-    mock.restore()
     logCalls = []
   })
 
-  test("#given non-Bun runtime #when scheduleDeferredModelOverride is called #then it returns without throwing", async () => {
+  test("#given bun:sqlite import fails #when scheduleDeferredModelOverride is called #then it returns without throwing", async () => {
     //#given
+    __setBunSqliteImporterForTesting(async () => {
+      throw new Error("bun:sqlite unavailable")
+    })
+
     //#when
     expect(() => {
       scheduleDeferredModelOverride("msg_unavailable", {
@@ -52,9 +52,9 @@ describe("scheduleDeferredModelOverride bun:sqlite unavailable", () => {
     await flushMicrotasks(5)
 
     //#then
-    const logMessages = logCalls.map(([msg]) => msg)
-    expect(logMessages).toContain(
-      "[ultrawork-db-override] bun:sqlite unavailable (non-Bun runtime), skipping deferred override",
-    )
+    expect(logCalls).toContainEqual([
+      "[ultrawork-db-override] bun:sqlite unavailable (non-Bun runtime), skipping",
+      undefined,
+    ])
   })
 })