fix: remove --no-session-persistence (unsupported on claude 2.0.60)

Dalidou runs Claude Code 2.0.60 which does not have this flag
(added in 2.1.x). Removed from both extractor_llm.py and the
host-side batch script. --append-system-prompt and
--disable-slash-commands are supported on 2.0.60.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

scripts/batch_llm_extract_live.py

@@ -118,7 +118,6 @@ def extract_one(prompt, response, project, model, timeout_s):
         "claude", "-p",
         "--model", model,
         "--append-system-prompt", SYSTEM_PROMPT,
-        "--no-session-persistence",
         "--disable-slash-commands",
         user_message,
     ]