docs(claude): correct runner-label note (runners are repo-scoped)

[owine]

Sourcery review of #107: these runners are registered per repo (see the troubleshooting section's repos/<caller>/actions/runners), so a reused label can't send deploys to another repo's host; the job would just queue. Fixes the note I added in #107.

Summary by Sourcery

Correct the runner-label guidance for adding self-hosted hosts.

Bug Fixes:

• Correct the self-hosted runner guidance to clarify that runners are repository-scoped and reused labels cannot route deployments to another repository's host.

Documentation:

• Update the host setup documentation with accurate runner registration and queuing behavior.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the new-host runbook highlights to accurately explain that self-hosted runners are registered per repository, so labels are not globally shared across repositories and reused labels cannot redirect deployments.

File-Level Changes

Change	Details	Files
Correct the self-hosted runner labeling guidance to reflect repository-scoped runner registration.	Remove the claim that reusing a label routes deployments to another repository’s host. Explain that each repository requires its own runner regardless of label, and a label mismatch across repositories causes jobs to queue rather than route elsewhere.	CLAUDE.md

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

Sourcery assessment

Approved.

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