Rewrite README.md and all setup guides to reflect the current native
GraphQL WebSocket architecture (replacing stale headless Chrome/WebSocket
interception descriptions). Add new docs/IRC.md with complete IRC command
reference, vote syntax, and ticker symbol table.
Archive pre-edit docs to docs/archive/setup-backup-2026-05-10/ and move
historical development notes from docs/ root into docs/archive/.
Co-authored-by: Cursor <cursoragent@cursor.com>
