Expand README intro with methodology rationale

Differentiate project-level install paths per agent

Add multi-agent install paths and universal .agents/skills/ directory

Fix npx skills add command to use correct GitHub owner/repo syntax

Make skill agnostic to Agent Skills open standard

Remove writing skill from main, fix consistency issues

Fix cross-reference inconsistencies across skill and reference files

Restructure commands as reference files with progressive disclosure

Fix remaining vault reference, convert writing transitions to principles

Update README for two skills, remove last vault reference

Add writing skill, streamline coding skill

Expand SKILL.md with full methodology

Rewrite SKILL.md as operative playbook

Remove tool-specific terminology (vault → docs)

Expand SKILL.md with full methodology