Improve primitive help text shown by --list-operations

[matthewhorridge]

Summary

• Rewrites the opening docstring paragraph of all 23 primitives in a consistent imperative voice, with each description naming the operation's serialized settings inline — before/after:
  • offset: "Operator that applies an offset to a numerical value." → "Add a constant offset (number) to numeric values."
  • normalize_text: "Perform a text normalization operation." → "Apply a single text normalization: strip, lower, upper, remove_accents, remove_punctuation, or remove_special_characters."
  • reduce: "Reduction operation that transforms N inputs to 1 output." → "Reduce a list of values to a single value using reduction: any, none, all, one-hot, or sum."
• Since --list-operations derives its output (and the JSON summary field) from these docstrings, the listing now tells rule authors and AI agents how to configure each operation, not just what it does
• Detail paragraphs below the summaries are preserved; README sample output updated to match

Test plan

• pytest tests — 224 passed (spot-check assertion updated to the new convert_units text)

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