Agent Skills: parallel-delivery

How a ticket moves through multiple parallel sessions — one orchestrator authoring tickets, N workers each claiming and delivering one ticket end-to-end in an isolated workspace. Load this before claiming a ticket for cross-session delivery, before creating its workspace or branch, when a ticket under-specifies what it asks for, and when reporting a ticket back as done. Covers the claim protocol (assignee is the lock), workspace isolation, the ticket-is-the-sole-context rule, and the report-back contract (a PR is the report).