refactor(execute-phase): wave-based blocking execution
Replace background agents + polling with blocking Task calls. Orchestrator stays lean (~15% context), subagents load full workflow. - Archive old execute-phase command and workflow - Add subagent-task-prompt.md template (orchestrator→subagent contract) - Rewrite execute-phase with wave-based parallelization - Dependency analysis groups plans into execution waves - Parallel Task calls within waves, sequential across waves - No TaskOutput polling - Task blocks until completion Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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