ea9518e712
Schema-only change. DDL adds tier + topic on fresh tables and uses ADD COLUMN IF NOT EXISTS on existing tables (idempotent across pod restarts). New conditional indexes match the wing/hall pattern. No behavior change in this commit — UpsertEntity still writes only the original columns; tier + topic stay '' on every row. M2 plumbs the parser through. The empty default means existing queries are untouched until the rest of the chain lands. Part of infra#72 — brain DIKW tier redesign.