docs: sync wiki with v1.18.0 and lift archive freeze Remove the frozen-archive banners from every page (ADR-0042 amendment) and replace stale facts across the wiki with v1.18.0 reality: default models (claude-opus-5-5, gemini-3.8-flash, gpt-5.4-mini), the full 10-provider catalog including deepseek/mistral/cohere, setup wizard behavior (list price + not-measured quality label, Enter selects default), corrected Gemini cached-input pricing, and illustrative model IDs in command examples. Strip leftover ADR/OQ references from prose. Add the upgrade command and OpenAI-compatible provider page to _Sidebar.md.
docs: freeze wiki as an archive pointing to commitbrief.com/docs Every page gets a banner linking to its nearest site equivalent; page bodies, file names and the page set are unchanged. Per ADR-0042 the wiki is never edited again after this commit.
docs: add the upgrade command page