Prompt Intf.doc

Prompt_intf – Structured prompts for LLM calls
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`Prompt_intf` is a tiny utility module that formalises what a *prompt* is in
the context of the **meta-prompting** pipeline shipped with OChat.  It gives
callers a *typed* representation instead of raw strings so that:

* individual sections can be manipulated independently (e.g. prepend a system
  directive, inject trace-ids, attach long examples as foot-notes …),
* the final assembly logic lives in one place, ensuring a consistent textual
  layout across the whole code-base.

Unlike `Prompt_session.t`—which stores past interactions—`Prompt_intf.t` is
dedicated to building the *next* single prompt to send to the model.

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