Add .wiki/ Karpathy skeleton

Local room-meta wiki: index, overview, log, schema (CLAUDE.md), and empty
raw/entities/concepts/packages/sources subtrees with .gitkeep placeholders.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.wiki/log.md

@@ -0,0 +1,9 @@
+# Log
+
+Append-only. Format: `<YYYY-MM-DD> <event> <topic> [details]`.
+
+Events: `started`, `promoted`, `registered`, `archived`.
+
+---
+
+2026-05-05 bootstrapped meeting-room redesign (initial .wiki/ skeleton)