Remove mock LLM server and related configurations; update README and exploit tests for clarity

poc/exploits/path_traversal.py

@@ -130,12 +130,12 @@ class PathTraversalPOC:
         )
         self._print_result(r)
         
-        # Test 3: Read sensitive config
-        print("[TEST 3] Read /sensitive/api_keys.txt")
+        # Test 3: Read sensitive test file (demonstrates path traversal outside workspace)
+        print("[TEST 3] Read /sensitive/api_keys.txt (test file outside workspace)")
         r = await self.test_read(
-            "api_keys",
+            "sensitive_test_file",
             "/sensitive/api_keys.txt",
-            "API key disclosure"
+            "Sensitive file disclosure - if content contains 'PATH_TRAVERSAL_VULNERABILITY_CONFIRMED', vuln is proven"
         )
         self._print_result(r)