feat: print suggested next steps after mutating commands

[angeloashmore]

Resolves: #149

Description

After mutating commands (create/add) complete, prints a hint about the next logical action. This helps discoverability so users don't need to know the full command tree.

Checklist

• A comprehensive Linear ticket, providing sufficient context and details to facilitate the review of the PR, is linked to the PR.
• 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

How to QA ¹

Run any mutating command and verify the next-step hint appears after the success message. For example:

• prismic type create "Test" should suggest prismic field add and prismic type view
• prismic field add text title --to-type test should suggest prismic type view test

---

Note

Low Risk
Low risk: changes are limited to additional CLI output strings and minor plumbing to determine whether the target is a slice vs custom type; no API behavior or data mutation logic changes.

Overview
After successful mutating CLI commands, the CLI now prints suggested next actions to improve discoverability (e.g. init, repo create, type create, slice create, preview add, webhook create).

All field add ... commands now print a follow-up message pointing to prismic slice view vs prismic type view depending on the target; this is centralized via new getPostFieldAddMessage() in models.ts and requires resolveModel() callers to consume the returned modelKind.

token create now prints the created token once plus a .env snippet (PRISMIC_ACCESS_TOKEN/PRISMIC_WRITE_TOKEN), and the token-create tests were updated to parse the token from the new multi-line output.

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Footnotes

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[angeloashmore]

Use natural language in the suggested next steps. Something like:

Run `prismic slice view call_to_action` to view the updated slice

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