feat: add slice edit and slice edit-variation commands

[angeloashmore]

Resolves: #92

Description

Adds slice edit and slice edit-variation commands to update slice and variation metadata after creation.

Also fixes type edit:

• Adds try/catch fallback for local adapter call when the custom type doesn't exist locally
• Removes --repeatable/--single flags (the Custom Types API rejects updates to the repeatable property)

Adds E2E tests for type edit, slice edit, and slice edit-variation.

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

node --run build
./dist/index.mjs slice edit --help
./dist/index.mjs slice edit-variation --help
./dist/index.mjs type edit --help

---

Note

Medium Risk
Adds new CLI flows that mutate slice/variation metadata via the Custom Types API and local adapter sync, plus removes type edit flags which is a small breaking CLI change. Risk is moderate due to touching update paths and user-facing command surfaces, but changes are scoped and covered by E2E tests.

Overview
Adds prismic slice edit and prismic slice edit-variation commands to rename a slice or a specific variation, persisting changes via updateSlice and syncing the local adapter (with update→create fallback) before regenerating types.

Updates prismic type edit by removing unsupported --repeatable/--single flags and adding the same adapter update→create fallback to avoid failures when the type isn’t present locally. Adds E2E coverage for the new slice commands and the updated type-edit behavior.

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