skill-count-cascade-both-architecture-md-and-memory-md

Skill count is referenced in both architecture.md and MEMORY.md independently — updating only one leaves the other stale. architecture.md also had phantom skill references (obsidian-markdown, obsidian-bases, json-canvas) that inflated the count without those skills existing on disk. When adding or removing any skill, grep both files for the count pattern and update atomically in the same operation.