Architectural Upgrade 2026-03-30: Modular Emacs, org-gtd v4.0, and PSF Phase 1

notes/closos-memory-persistence.org

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+#+TITLE: CLOSOS: Persistence by Default (Single Memory Abstraction)
+#+ID: closos-memory-persistence
+#+DATE: 2026-03-22
+#+FILETAGS: :architecture:lisp:os:closos:persistence:
+
+* Concept
+CLOSOS eliminates the distinction between volatile primary memory (RAM) and permanent secondary memory (Disk). Primary memory functions as a transparent cache for a persistent object store.
+
+* Key Principles
+- **The Living Image:** The system state is permanent. "Saving" is not an explicit user action; changes are inherently persistent in the object store.
+- **Undo Facility:** Since data is permanent, application writers are encouraged to implement sophisticated undo/redo facilities rather than manual file saves.
+- **Atomic Snapshots:** High-integrity state is maintained via atomic flips and log-structured techniques, ensuring the system can recover from crashes without data loss.
+
+* Source
+:PROPERTIES:
+:ID:       9c69a9ab-1c96-490e-9a8e-fbeafacba30e
+:END:
+- [[attachment:strandh-lispos.pdf][Robert Strandh, "CLOSOS: Specification of a Lisp operating system" (2013)]]