Build and release Gimble

Deliver the requested behavior and establish that it works. Gimble currently serves agents on this machine; local installation is the distribution target. For writing a workflow, use Author workflows. For operating one, use Use Gimble.

Priorities and working method

Work in the task worktree. Read its AGENTS.md, docs/definition-of-done.md, and the relevant requirement. Use Godoc for the API; use research and historical reviews to understand decisions. Materialize remote requirements locally before giving their absolute paths to agents.

Keep implementation as simple as the requirement permits. Workflow tactics stay visible in ordinary Go. Add no unrequested features, compatibility layers, or abstractions. A hypothetical edge-case concern needs a reasonable actual failing test before it becomes repair work.