fix(help): describe the content model in the root help

[angeloashmore]

Resolves: #274

Description

The CLI never says what a Prismic model is made of. An agent asked to model a blog post adds a key text field named author, even when the project has an author type. The reader gets a name in a string instead of a link to a document.

The root help now has a MODELING section. It states the shape of a model, names the content relationship as the way a page uses another type, and points to prismic docs view content-modeling for the rest. The plan on #274 also asked for a line after prismic type create. This PR leaves it out, because #283 added the same shape of line and then removed it.

The author is a content relationship in 14 of 15 trials, against 3 of 5 on main. The other evals held.

Checklist

• If my changes require tests, I added them.
• If my changes affect backward compatibility, it has been discussed.
• If my changes require an update to the CONTRIBUTING.md guide, I updated it.

Preview

$ prismic --help
...
MODELING
  Pages are page types, built from slices and fields. Content that is
  not a page is a custom type, such as an author or a navigation menu.
  A page references a custom type with a content relationship field,
  instead of repeating its content.
  Run `prismic type list` to see what a project has, and
  `prismic docs view content-modeling` for details.

How to QA ¹

$ node --run build
$ node dist/index.mjs --help
$ EVAL_TRIALS=5 PRISMIC_ALLOW_EVALS=true node --run evals -- \
    evals/design-sensible-models.eval.ts evals/check-before-acting.eval.ts

🤖 Generated with Claude Code

https://claude.ai/code/session_01Xywd7QAoQLV7eyGpDvvtMN

---

Note

Low Risk
Help text and a test assertion only; no runtime behavior or API changes.

Overview
Root prismic --help (and default help) now includes a MODELING section alongside existing guidance like ROUTES. The new text explains that pages are page types built from slices and fields, that non-page content lives in custom types, and that pages should link to those types via content relationship fields rather than duplicating data. It also directs users to prismic type list and prismic docs view content-modeling.

The --help integration test is updated to assert MODELING appears in the output.

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