R11: POST /admin/extract-batch with mode=llm now returns 503 when the
claude CLI is unavailable (was silently returning success with 0
candidates), with a message pointing at the host-side script. +2 tests.
R12: extracted SYSTEM_PROMPT + parse_llm_json_array +
normalize_candidate_item + build_user_message into stdlib-only
src/atocore/memory/_llm_prompt.py. Both the container extractor and
scripts/batch_llm_extract_live.py now import from it, eliminating the
prompt/parser drift risk.
Tests 297 -> 299.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Anto01
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