Show the linked issues' acceptance criteria #41

• Milestone: v1 · step: 5 · size ~300 changed lines (excluding tests) · delivery: code, through no-mistakes

What to build

Split out of issue #2. The engine reads the issues a pull request links (closing references, sidebar links, other repositories), finds the checklist under a configurable heading ("Acceptance criteria" by default), and the panel lists each acceptance criterion with its quoted text, a link to its issue and "not checked". Issue text is untrusted and its hidden content is flagged. No model.

How to try it by hand: Review a pull request that closes an issue with an acceptance-criteria checklist; the criteria appear in the panel.

Acceptance criteria

• Criteria parsed from recorded issues, including a custom heading and a cross-repository link.
• Pull requests into a non-default branch (where GitHub returns no closing references) say so.
• The panel lists criteria with quote, issue link and "not checked".

Blocked by

• Story and the review panel #30