Agent Skills: lisa-track

Resolves exactly one live configured-tracker leaf for durable project work, claims it idempotently, and persists its canonical reference in worktree-local state. Accepts an existing Jira/GitHub/Linear ref, a spec file, or plain text. Also accepts human_gate: <why a human must judge this first>, which files the leaf held — outside the build-ready lane, never claimed — instead of build-ready. Use directly to mention/create the related ticket, and as lisa-implement's mandatory input gate.