Trainer: documents - a text word for word, one card per section

Bylaws and terms are not the model's to write. documents in a plan
names a markdown file beside it; every heading with text under it is
one alternative on a page of its own, its paragraphs the card's words.
Tomter Vel's bylaws of 23.04.2018 are the first.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GT37Z1Xtfd9pUuQtMTg6Yt

src/trainer/plan.rs

@@ -175,6 +175,9 @@ rest. Each is one line in the plan, and the builder does the wiring:
   each brought in. Two is plenty; name them as a person would ("plain,
   like a good notice on the door"; "warm, as a neighbour would put
   it"). Leave it out to tell one story.
+- **Carry a text word for word.** `documents` puts bylaws or terms on
+  a page of their own, one card per section, from a markdown file
+  beside the plan. Nothing rewords them.
 - **Keep the people in portal.** `people: memberships` keeps every
   group in portal itself: a desk invite is a place held until the
   person signs in, a person is their phone number first, and any