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"mattpocock-skills": patch
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Add the `implement-spec` skill (in-progress bucket, user-invoked). It takes a spec and its tickets and drives them to a single PR: the tickets are read as a task graph with blocking edges, so implementer subagents run in background worktrees across the ready frontier for concurrency, a merger subagent folds each one back into the PR branch, and the flow closes with `/code-review` before the PR is marked ready.