chore: bootstrap project structure (.tasks, .wiki, CLAUDE.md)

Adds canonical Karpathy LLM Wiki layout, .tasks/STATUS.md board,
and CLAUDE.md trigger set. Brings factory repo into projects-meta
indexing eligibility (sync-runner.ts:69 — needs .tasks/STATUS.md or
.wiki/index.md on default branch).

Bootstrap-manifest at .wiki/concepts/bootstrap-manifest.md records
skill versions used (project-bootstrap@1.7.0, layouts inline-fallback
from setup-wiki@1.0.0 / setup-tasks@1.0.0).

.wiki/index.md

@@ -0,0 +1,23 @@
+# Wiki Index
+
+Catalog of all wiki pages. One line per page, organized by type. The agent updates this on every ingest.
+
+## Overview
+
+- [overview.md](overview.md) — project overview
+
+## Entities
+
+<!-- (none yet) -->
+
+## Concepts
+
+<!-- (none yet) -->
+
+## Packages
+
+<!-- (none yet) -->
+
+## Sources
+
+<!-- (none yet) -->