Feat: Implement local path code review preflight and add system prompt tests

tests/systemPrompt.test.ts

@@ -0,0 +1,12 @@
+import { getSystemPrompt } from '../src/utils';
+
+describe('base system prompt', () => {
+    it('requires local project paths to be inspected before upload requests', () => {
+        const prompt = getSystemPrompt();
+
+        expect(prompt).toContain('Local Path Handling Rule');
+        expect(prompt).toContain('inspect the path before asking for uploads');
+        expect(prompt).toContain('Do not say "upload the source code"');
+        expect(prompt).toContain('For code review requests, first confirm path access');
+    });
+});