feat: expose lint_wiki tool in MCP server

feat: smart query routing — load only relevant pages via index.md

feat: add wiki lint command with vault audit via Claude

feat: add update_index (index.md) and wire log into add_document

refactor: extract read_frontmatter helper from read_url_from_frontmatter

feat: add append_log for activity tracking (log.md)

chore: migrate to uv, add pyproject.toml and lockfile

docs: write proper README with concept, usage, schema, MCP config, roadmap

feat: wiki-compiler MVP — wiki add, wiki query, MCP server