Add ASCII logo, spinner during install, all packages core, fix tests

- ASCII art logo on website hero and OAuth callback page
- Clean spinner during postinstall instead of npm noise
- pi-session-search and pi-memory moved to core (13 packages)
- pi-generative-ui is the only optional package
- Alpha Hub callback page branded with Feynman logo

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

extensions/research-tools/shared.ts

@@ -14,14 +14,7 @@ export const FEYNMAN_VERSION = (() => {
 	}
 })();
 
-export const FEYNMAN_AGENT_LOGO = [
-	"███████╗███████╗██╗   ██╗███╗   ██╗███╗   ███╗ █████╗ ███╗   ██╗",
-	"██╔════╝██╔════╝╚██╗ ██╔╝████╗  ██║████╗ ████║██╔══██╗████╗  ██║",
-	"█████╗  █████╗   ╚████╔╝ ██╔██╗ ██║██╔████╔██║███████║██╔██╗ ██║",
-	"██╔══╝  ██╔══╝    ╚██╔╝  ██║╚██╗██║██║╚██╔╝██║██╔══██║██║╚██╗██║",
-	"██║     ███████╗   ██║   ██║ ╚████║██║ ╚═╝ ██║██║  ██║██║ ╚████║",
-	"╚═╝     ╚══════╝   ╚═╝   ╚═╝  ╚═══╝╚═╝     ╚═╝╚═╝  ╚═╝╚═╝  ╚═══╝",
-];
+export { FEYNMAN_ASCII_LOGO as FEYNMAN_AGENT_LOGO } from "../../logo.mjs";
 
 export const FEYNMAN_RESEARCH_TOOLS = [
 	"alpha_search",