feat: add copy proofread review workflow

[stepskop]

Add copy proofread review from workflow. Original idea was to automate the public-facing copy review, that is done manually by a copywriter on a CODEOWNER review request.

On a label-triggered PR, it proofreads the public-facing copy in the given paths against Apify's style guide and leaves inline suggestions. It never approves or requests changes. The rules come from the apify-proofreader skill, sparse-checked-out at run time from apify/agent-skills-internal, so no repo vendors a copy that drifts.

Caller side:

on:
  pull_request:
    types: [labeled]

jobs:
  proofread:
    if: github.event.label.name == 'copy-review'
    uses: apify/workflows/.github/workflows/copy_proofread_review.yaml@main
    secrets:
      anthropicApiKey: ${{ secrets.ANTHROPIC_API_KEY }}
      agentSkillsToken: ${{ secrets.APIFY_SERVICE_ACCOUNT_GITHUB_TOKEN }}
    with:
      paths: |
        - `src/packages/intl/src/en/`

The workflow removes whichever label triggered the caller, so re-adding it re-runs the review.

Test run: https://github.com/apify/apify-core/pull/29111

[Copilot]

Pull request overview

Adds a reusable GitHub Actions workflow that runs a Claude-based “copy proofread” review on demand (typically via a PR label), using style rules loaded at runtime from apify/agent-skills-internal.

Changes:

• Documented how to call the reusable workflow (including required secrets and optional repo-specific instructions).
• Added .github/workflows/copy_proofread_review.yaml reusable workflow that installs the apify-proofreader skill and runs anthropics/claude-code-action to leave inline suggestions.
• Added automatic cleanup behavior to remove the trigger label after the run completes.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
README.md	Adds caller-side usage documentation and an example configuration.
.github/workflows/copy_proofread_review.yaml	Introduces the reusable “copy proofread review” workflow and its steps/permissions.

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