claude@clouddev1
a7d459f8f2
`render_explain_plan` now classifies each plan node and colours its category-bearing keywords through the styled-runs mechanism. - `PLAN_TAXONOMY`: a substring-pattern table mapping the engine's plan vocabulary to four semantic classes — full scan / temp B-tree -> Expensive, index search / covering index / PK lookup -> Efficient, automatic index -> AutomaticIndex. An unrecognised detail renders neutral, since the engine's plan vocabulary may grow. - Only the matched keyword run carries the category colour; connectors, prefixes and table / index names stay neutral (ADR-0028 §6). The display-SQL line is wholly neutral. - An automatic-index node also gets the distinct "← add an index?" advice tag, so it reads as guidance, not merely "this is slow". 1158 tests pass (+7); clippy clean.