dsh-memory-ga: A Gated Layered Memory Plugin for DeepSeek Harness

`dsh-memory-ga` is a DeepSeek Harness plugin designed to address memory confusion in Coding Agents. Its core principle is “no execution, no memory”: it stores information only after a tool or the user confirms a fact. The plugin maintains `$DSH_HOME/memory` through a layered file system (L0-L3), including a hard-injected L1 index, L2 fact archives read on demand, and a session notepad. It exposes `start_long_term_update` to provide a gated settlement protocol that avoids automatic memory pollution, and includes optional soft nudges to help users crystallize memory. The approach emphasizes controllability, auditability, and privacy.