Deterministic, zero-dependency reply-draft engine — the library default Cairnloop.Automation.DraftGenerator.

Generates structured grounded proposals for operator review without calling any external model: strong grounding yields a citation-anchored reply built from the primary canonical evidence, while weaker grounding asks for the missing detail (:clarification) or recommends a human handoff (:escalation). Hosts that want model-composed replies configure Cairnloop.Automation.DraftGenerator.Anthropic (which falls back to this engine when grounding is weak or no API key is set).