Issue Graph — 确定性 issue 关系图（原生边 + 图计算 + 并发原语）

Repo profile — read .claude/repo-profile.md first. This skill is repo-agnostic; arc is the reference implementation. It resolves the repo from the git remote (repo_slug); its runtime scripts are referenced as <plugin_root>/skills/issue-graph/scripts/*.ts (the profile's plugin_root — so they resolve wherever the plugin is checked out). Arc's own issue-number provenance for any lessons is not inlined here.

「选择和传播都是纯计算，LLM 只负责做，不负责猜该做谁。」

GitHub 原生图（sub-issues + issue dependencies）是关系数据的唯一真相；本 skill 提供四个确定性脚本，把「哪些 issue 现在能做 / 哪些父 issue 该收尾 / 哪些 issue 被某次关闭解锁」从模型猜测变成每轮现算的图计算。图不落盘——唯一持久状态是 GitHub 本身，所以永远没有索引漂移。

设计来源、Phase 0 演练证据（149 条边、17 个 rollup 候选、fencing 实测）、并发 设计全文见 arc case-law 附录（repo-profile Case Law）。

脚本（scripts/，全部 REST-only + 手动分页）