ci(workflows): switch Claude review to built-in /code-review

[AnnatarHe]

The Claude auto review was posting "No issues found" after a few seconds. This replaces the short custom prompt with the built-in high-effort /code-review flow used by the working rawback-app/web workflow. Only .github/workflows/claude-code-review.yml changed. The runner stays ubuntu-latest.

This PR's own review run may be skipped because the workflow file differs from the default branch. That is expected.

What changed

• Prompt is now /code-review high <PR#> --comment (the built-in command, not the code-review@claude-code-plugins plugin).
• 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; checks, statuses, and actions are read.
• show_full_output: true so an early or shallow run leaves a reason in the job log. The reference comment said the repo was private; this repository is public, so the comment notes that Actions logs are visible.
• Allowed tools are Bash(gh:*), Bash(git:*), and mcp__github_inline_comment__create_inline_comment.
• Concurrency group claude-review-<PR#> with cancel-in-progress: true, so a new push replaces a review of a stale diff.
• Triggers also include ready_for_review and reopened.
• Draft PRs and bot PRs (release-please) are skipped.
• New Assert the review actually ran step fails a successful action that spent 0 turns and $0, and warns when a review launches no subagents.
• CLAUDE_CODE_DISABLE_BACKGROUND_TASKS was not set here, so nothing was removed.

  

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

❌ Your project check has failed because the head coverage (14.21%) is below the target coverage (60.00%). You can increase the head coverage or adjust the target coverage.

@@           Coverage Diff           @@
##             main      #17   +/-   ##
=======================================
  Coverage   14.21%   14.21%           
=======================================
  Files          20       20           
  Lines         802      802           
  Branches      184      184           
=======================================
  Hits          114      114           
  Misses        669      669           
  Partials       19       19           

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