fix: resolve pre-existing biome lint errors in test files

- developer-notify.test.ts: split long toContain/stringContaining lines
- skillhub-custom-import.test.ts: prefix unused param with underscore

Made-with: Cursor

Author: caiqiling958-cmd

apps/controller/tests/skillhub-custom-import.test.ts

@@ -27,7 +27,7 @@ const { SkillDb } = await import("../src/services/skillhub/skill-db.js");
 
 function stubExtractTo(
   slug: string,
-  skillsDir: string,
+  _skillsDir: string,
   opts: { withPackageJson?: boolean } = {},
 ) {
   vi.mocked(extractZipMock).mockImplementationOnce(