PSI - Plan Spec Implement Structured workflow for planning, specifying, and implementing changes with documentation-first approach. When to Use Only use when: - Explicitly directed by the user - Mentioned in project file Do not use automatically - this is an opt-in workflow, not a default. Core Workflow Plan → Spec → Implement Phases are independent - you can start with any phase, but all must ensure documentation stays up-to-date. Key Principles 1. Ephemeral planning - Plans stored in (not committed) 2. Documentation-first - Specs applied to project docs/READMEs/AGENTS.md 3. Test-first imple…