deep-fusion-beats-plugin-install-for-overlapping-skills

When integrating capabilities from external repos that overlap with existing skills, plugin install creates dual competing intelligence sources (e.g., Impeccable anti-slop vs frontend-taste anti-slop), violating Law #2 (Zero Ambiguity) and bloating context window. The correct approach is Deep Fusion: cherry-pick non-overlapping intelligence and merge it into the existing skill, making the existing skill smarter rather than adding a competing source. Selective install is only correct for wholly new domains with zero overlap.