40-01-state-ownership
Every piece of mutable state has exactly one owner that writes it. Others read. Prevents "who set this?" and invisible coupling.
Also installable via skills CLI
npx skills add Cygnusfear/agent-skills/skills/obsidian-plan-wiki/playbook/40-architecture/40-01-state-ownership
Source
Path:
skills/obsidian-plan-wiki/playbook/40-architecture/40-01-state-ownership/SKILL.md(main)