[NOTICKET] planner: group-first tool selection (A17)

[NOTICKET] tools: quality blocks for forecast + ab_test, forecast backtest, CK7 fix

[NOTICKET] feat(tools): analyze_importance + analyze_cluster (unregistered) + CK7

[NOTICKET] feat(report): embed analyze_* auto-charts, share one chart extractor (A21)

[NOTICKET] feat(slow-path): per-step SSE progress, bilingual (A22)

[NOTICKET] docs: analytical-tools foundation — conventions, DEV_PLAN 0.9, status sync