Chat Customizations Editor Split-view management pane for AI customization items across workspace, user, extension, and plugin storage. Supports harness-based filtering (Local, Copilot CLI, Claude). Spec — always read before making changes, always update after. Key Folders | Folder | What | |--------|------| | | , , — shared interfaces and filter helpers | | | Management editor, list widgets (prompts, MCP, plugins), harness service registration | | | Sessions-window overrides (harness service, workspace service) | | | Sessions tree view counts and toolbar | When changing harness descriptor in…