fix(cli): handle sqlite lock errors

packages/opencode/test/kilocode/database/sqlite-error.test.ts

@@ -0,0 +1,30 @@
+import { describe, expect, test } from "bun:test"
+import { LockTimeoutError, SqlError, UnknownError } from "effect/unstable/sql/SqlError"
+import { busyMessage, isBusy } from "@/kilocode/database/sqlite-error"
+
+describe("SQLite errors", () => {
+  test("recognizes lock timeouts as busy database errors", () => {
+    const error = new SqlError({
+      reason: new LockTimeoutError({
+        cause: new Error("database is locked"),
+        message: "Failed to execute statement",
+        operation: "execute",
+      }),
+    })
+
+    expect(isBusy(error)).toBe(true)
+    expect(busyMessage).toBe("Database is busy. Please try again in a moment.")
+  })
+
+  test("does not classify other SQLite errors as busy", () => {
+    const error = new SqlError({
+      reason: new UnknownError({
+        cause: new Error("constraint failed"),
+        message: "Failed to execute statement",
+        operation: "execute",
+      }),
+    })
+
+    expect(isBusy(error)).toBe(false)
+  })
+})