claude@clouddev1
ce153bde4c
New dedicated Reference page for the advanced-mode SQL query features under-covered by "Querying & inspecting": DISTINCT, GROUP BY/HAVING, set operations (UNION/INTERSECT/EXCEPT), subqueries (IN + correlated NOT EXISTS), CTEs (WITH), and expressions (CASE/CAST/functions) — each with a worked example on the library schema and real captured output. Adds an explicit "supported subset" boundary note (views, triggers, transactions, window functions, multi-statement batches are not available) rather than linking to general SQL, which would advertise unsupported features. Grounded in ADR-0030 §3/§13 and the SQL grammar tests. Cross-link added from Querying & inspecting. Build clean (26 pages); box-drawing output verified; forbidden terms clean.