claude@clouddev1
f62cccec55
explain now wraps the advanced SQL commands — select, with (CTE), insert, update, delete — in addition to the DSL show data/update/ delete it already covered, rendering through the same plan tree (ADR-0039, closing the ADR-0030 OOS-2 gap). Implemented as a second Advanced `explain` CommandNode under the shared entry word, reusing the established shared-word dispatch (SQL-first, DSL-fallback) rather than new grammar machinery. build_explain_sql slices the inner SQL off the source and reuses the existing SQL builders; do_explain_plan runs EXPLAIN QUERY PLAN over the carried text verbatim (never executes, so safe for destructive verbs). Advanced explain update/delete now route through SQL with an identical plan; DSL-explain tests pinned to simple mode. Help and usage text now list the advanced explain forms.