Orchestrate, drive an issue to a merged PR

Self-contained mock of a maintainer workflow, used by CMA_orchestrate_issue_to_pr.py. The cookbook zips this directory and hands it to the agent.

• gh-mock, bash script that fakes the relevant gh subcommands. State persists in .gh-state/.
• issue_42.json, Unicode bug report (Café Culture → caf-culture). Vague enough that the agent has to read code.
• src/url_utils.py + src/blog.py + tests/test_urls.py, buggy slugify() and the failing tests that catch it.

Two recovery points are planted: an incomplete first fix fails CI with a pytest traceback, and the mock reviewer-bot blocks the merge if slugify() is missing a docstring. A healthy run ends with .gh-state/pr_101.json showing state: merged, ci/test: pass, and an APPROVED review.