Read-only MCP server for data cataloging and quality validation — dataset/column discovery, profiling, rule-based validation, and semantic search over a YAML-declared catalog
*A few empty commits in the history are leftover from testing the git MCP tool (`git_commit` and friends) through an earlier chat REPL.* Read-only MCP server for data cataloging and quality validation over a YAML-declared catalog of Parquet datasets, plus a web chat frontend and supporting host process to use it.