POST /code/runtime/pull-requests

POST /api/v1/code/runtime/pull-requests on the Caveman Cloud control plane. Requires a Caveman Code runtime token (Authorization: Bearer ccrt_...), minted by POST /code/runtimes/{runtimeId}/token. Not exposed to autonomous agents: Not RBAC-guarded — authenticated by a Caveman Code runtime token, for a live automation run whose session is on that runtime's computer and whose approved revision declares a github.pull_request output (ADR 0133), or for a person's own chat on that Cloud computer, from the chat's own caveman/* branch, on the repository Cloud made the computer for, whose person GitHub confirms may push to it, on a computer no other person's work shares (ADR 0136); Cloud opens it with the GitHub App. Agents authenticate through a scoped control-plane session and never touch these directly.