The OpenAPI document describes editing a pull, its reviews, approving it here and assigning an issue or pull #5241

Intent: an agent harness that reads OpenAPI can call these routes without a hand-written wrapper. Today src/contract/openapi.ts has no row for them.

Done:

• [ ] src/contract/openapi.ts has one row each for: PATCH {REPO}/pulls/{number}, GET and POST …/pulls/{number}/reviews, POST …/pulls/{number}/approve-here, and PUT {REPO}/issues/{number}/assignee and {REPO}/pulls/{number}/assignee. Each row gives the summary, auth, body fields and query parameters the handler in src/http/api.ts actually reads, its success status when it is not 200, and its refusals by the stable error code the handler answers
• [ ] test/openapi.test.ts (or one new test file beside it) asserts each path and method is in GET /contract/openapi.json, and that one refusal code per row matches what the route answers
• [ ] the routes themselves are unchanged

Files: src/contract/openapi.ts and one test. Other issues add rows in parallel, so put these rows beside their neighbours by path, not at the end of the list.