Implement llmwiki-cli v0.1.0 — a CLI tool for LLM agents to build and
maintain personal knowledge bases via pure filesystem + git operations.
Phase 1 includes:
- wiki init: create wiki with directory structure, SCHEMA.md, git init
- wiki registry: list all registered wikis
- wiki use: switch active wiki
- Global registry at ~/.config/llmwiki/
- Wiki resolution chain (--wiki flag > cwd > walk up > default)
- 23 tests passing
- Published to npm as llmwiki-cli
