Query plan record action and POST explain: plain or generic EXPLAIN,
and EXPLAIN (ANALYZE, BUFFERS) for single SELECTs in a rolled-back
READ ONLY transaction with statement_timeout, behind explain_analyze,
always audited, ANALYZE plans and parameters never stored. UI API
extension /qqq/v1/qbit/db-performance (overview, activity with live
text only for view_live_text, explain, statements/lookup) with a
committed OpenAPI fragment and contract test. Eight full-width typed
home widgets. Data-driven help bundle with a coverage test. README,
CHANGELOG and UPGRADE.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
