21-skill-phase-build-fits-single-1m-context-session

A full 21-skill delivery phase (Layers 6+7 of Full-Stack Delivery Intelligence) completes comfortably within one 1M context session including lint validation, memory updates, and handoff commit. Parallel writes are essential for throughput — sequential writes would likely exhaust context budget before completion. Plan phases at ≤25 skills per session to preserve headroom for verification and session-close.

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