feat(core): sql_workbench component (issue 0032)
ImGui SQL workbench: editor (text_editor + CodeLang::SQL), schema sidebar
desde sqlite_master, tabla resultado (table_view), historial. Backend
sql_workbench_run_query separado de UI; readonly opt-in (rechaza non-SELECT/
PRAGMA/EXPLAIN/WITH); cap de filas (truncated_at, default 10000); last_ms
medido con steady_clock.
API: sql_workbench(id, sqlite3*, SqlWorkbenchState&, size). DB caller-owned.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
egutierrez
d854bcbae9