feat: add quick demo login, fix archived knowledge filter and workflow completion state

fix: eliminate N+1 queries on knowledge list/search endpoints

feat: proposal archive/restore governance, knowledge derived status, documents live polling, yellow archive UI

feat: workflow visualization, knowledge detail, fixtures, restart test, demo docs

feat: show evidence quotes on knowledge cards

feat: hybrid search (lexical + vector + RRF) on knowledge endpoint

feat: complete end-to-end platform with all standout behaviors