Local pipeline-style Doris code review

This skill reviews a Pull Request against a local clone of the Apache Doris source repository. It is a contributor-side workflow, not a cluster-operations skill: it never talks to a running cluster and never needs one.

Usage:

/doris-repo-review https://github.com/apache/doris/pull/66807
/doris-repo-review https://github.com/apache/doris/pull/66807 focus on class loading and compatibility
/doris-repo-review 66807            # a bare number defaults to apache/doris

This ports the review flow of apache/doris/.github/workflows/code-review-runner.yml to a local machine: first align the current directory to the PR head, take the diff from local git, and produce one English and one Chinese document under the current directory's review-docs/. Everything else - required reading, main-agent risk scan, subagent split, shared ledger, at most 3 convergence rounds, an explicit conclusion per checkpoint - matches CI.