opsx-exttask-queuelisted

# Autonomous Task-Queue Workflow End-to-end orchestrator for OpenSpec. Takes a user's request, breaks it into a queue of discrete changes, and processes each one in an isolated git worktree — from planning through verified implementation — before handing back to the user for final review and commit. ## Core Principles 1. **Queue-first**: Break the request into discrete, independent changes before touching any code. 2. **Isolated execution**: Each change runs in its own git worktree so changes never interfere with each other. 3. **Verify before commit**: Each change is implemented and verified automatically, but only committed after the user reviews it. 4. **Parallel within, sequential across**: Maximize parallelization within each change's phases (spawn as many subagents as the work allows), but process changes one at a time through the queue. When dispatching subagents within a phase: - Launch all independent subagents in a single tool-call turn — do not wait between dispatches - Give each subagent a complete, self-contained prompt with all context it needs so it can work autonomously - Use background execution for subagents whose results are not blocking the next immediate action - Only serialize work when there is a true data dependency ## Hard Requirement OpenSpec must be initialized in the project. If the `openspec/` directory does not exist, stop immediately and tell the user to run `openspec init` and `openspec update` first. Do not proceed without this. ## Runn