What problem does it solve? Engineering context is lost between sessions, forcing repeated rediscovery of architecture decisions, locked systems, and validation constraints. This Skill maintains a durable project memory file so future work starts from established facts instead of re-investigating the codebase. ## Core Features & Use Cases - Durable Fact Capture: Records architecture decisions, canonical data ownership, fragile subsystems, rollback points, and validation requirements in PROJECT_STATE.md. - Change Discipline: Requires reading existing memory and comparing it against current code before significant changes, updating only when durable facts change. - Failure Documentation: Captures root causes, affected subsystems, resolutions, and validation performed after important failures. - Use Case: Before modifying the emergency detection module, read the recorded state model and validation limits, then update memory only if the deterministic behavior materially changes. ## Quick Start Read the project memory file and record any durable architecture or validation facts from the current work session.