kata-execute-phase

Orchestrator stays lean: discover plans, analyze dependencies, group into waves, spawn subagents, collect results. Each subagent loads the full execute-plan context and handles its own plan.

Context budget: ~15% orchestrator, 100% fresh per subagent.

<execution_context> @./references/ui-brand.md @./references/planning-config.md @./references/phase-execute.md </execution_context>

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