chore: bootstrap project structure

- .wiki/ with canonical Karpathy layout (CLAUDE.md, index, log, overview, raw)
- .tasks/ with canonical STATUS.md board
- CLAUDE.md with skill triggers
- Bootstrap manifest in .wiki/concepts/

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.wiki/log.md

@@ -0,0 +1,15 @@
+# Wiki Log
+
+Append-only operation log. Format:
+
+```
+## [YYYY-MM-DD] <op> | <one-line description>
+```
+
+Operations: `init`, `ingest`, `query`, `lint`, `refactor`, `decision`.
+
+Parseable: `grep "^## \[" .wiki/log.md | tail -20`.
+
+---
+
+## [2026-05-03] init | wiki bootstrapped via setup-wiki@1.0.0