fix(init): describe --repo as an existing repository domain

[angeloashmore]

Resolves: #276

Description

The --repo option was described as "Repository name". It takes the domain of a repository that already exists, not a name you choose. An agent read the old wording as a name to invent and asked the user for one.

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 init --help
...
OPTIONS
  -r, --repo string   Domain of an existing repository to connect to

How to QA ¹

Run the evals in a container or a disposable VM. They run an agent with bypassPermissions against a real account.

$ node --run build
$ node dist/index.mjs init --help
$ EVAL_TRIALS=5 PRISMIC_ALLOW_EVALS=true node --run evals -- \
    evals/initialize-projects.eval.ts evals/check-before-acting.eval.ts

🤖 Generated with Claude Code

https://claude.ai/code/session_01EDG5bb3gLsNgvJZR3bANY3

---

Note

Low Risk
Help-text-only change with no runtime or CLI behavior impact.

Overview
Updates the prismic init --help text for -r, --repo from "Repository name" to "Domain of an existing repository to connect to", so users and tooling do not treat the flag as a new name to invent when connecting to an existing Prismic repo.

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