dsh-memory-palace: Add Markdown file-based memory to DeepSeek Harness

The DSH plugin `dsh-memory-palace` aims to provide cross-session persistent memory for DeepSeek Harness. It stores memory in human-editable Markdown files, including long-term memory (`MEMORY.md`) and daily logs, and supports a dual-layer memory structure at both user and workspace levels. Core functions include automatic memory reading and writing, automatic migration of expired logs to long-term memory, compatibility with WorkBuddy/CodeBuddy memory directories, and providing tools such as `memory_note` and `memory_read` for memory CRUD operations. The plugin supports a hybrid mode to preserve log evidence and features proactive memory and intelligent summarization capabilities. All configurations can be adjusted graphically via the DSH settings panel. This plugin...