fenic

Use when writing, editing, or debugging code that uses fenic (the `fenic` Python library, imported as `import fenic as fc`) — the semantic-DataFrame engine with LLM operators (semantic.map/extract/classify/predicate/reduce, embeddings), jq/markdown/transcript processing, chunking, and fuzzy matching. Covers fenic's import & namespace structure, semantic-operator calling conventions, model/session config, and known silent-failure traps. NOT for plain PySpark, pandas, or Polars code.

Use when fenic has been upgraded to a new version and the `fenic-mechanics` skill needs refreshing, or when explicitly asked to regenerate/update the fenic API reference. Regenerates the version-stamped reference from the installed fenic, surfaces the API deltas, and flags which hand-authored judgment sections to re-review.