ci: use built-in Claude /code-review instead of the plugin

[AnnatarHe]

Updates .github/workflows/claude-code-review.yml so Claude review matches the working rawback-app/web workflow. The plugin command was posting "No issues found" after a few seconds. runs-on stays ubuntu-latest. No other files changed. CLAUDE_CODE_DISABLE_BACKGROUND_TASKS was not set, so nothing was removed for it.

This PR changes the workflow file, so the action may skip its own review until the file matches the default branch. That skip is expected.

What changed

• Prompt is the built-in /code-review high <PR#> --comment. Removed plugin_marketplaces and plugins: code-review@claude-code-plugins, and the old /code-review:code-review prompt.
• Checkout uses actions/checkout@v7 with fetch-depth: 0 so the review can diff, log, and blame against the base branch.
• Permissions: pull-requests and issues are write. Added checks: read, statuses: read, and actions: read, plus additional_permissions for actions: read.
• show_full_output: true so the job log shows why a run stopped or skimmed. The comment notes this repository is public, so those logs are visible.
• claude_args allows Bash(gh:*), Bash(git:*), and mcp__github_inline_comment__create_inline_comment.
• Concurrency group claude-review-<PR number> with cancel-in-progress: true, so a new push replaces a review that is still running.
• Job if skips draft PRs and bot PRs (including release-please).
• New step Assert the review actually ran fails a successful action that spent 0 turns and $0, and warns when a review launched no subagents. A missing execution file only warns, which is the expected case when this workflow differs from the default branch.
• Comment that cited another repository's pull request was rewritten to describe the same failure mode without a foreign PR number.

  

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