Re-add MATRIX/COMMENT/PRICE_GROUPS_SYSTEM and generate_*_group_summaries_llm
removed in afe2748; align comment-group prompt with shop in attribution
prefix. Default report_config now includes the three llm_*_summaries flags.
Made-with: Cursor
Add suggest_scenario_groups_llm: single call with excerpt corpus + existing
label/triggers, parse scenarios JSON, merge into comment_scenario_groups
(up to 40) before build_competitor_brief. Record in keyword_suggest_llm.json
(schema_version 3). Skip with MA_SKIP_LLM_SCENARIO_SUGGEST. Update tests
and analysis view hint.
Made-with: Cursor
