refactor 2

LSP action surface for DeepSeek Harness: diagnostics, formatting, completion, code actions, symbols, signature help, inlay hints, and rename tools over language servers, plus the editor action protocol (lsp.actions.*) that makes the plugin the IDE integra

DSH refactor-insight skill plugin: turn codebase smells into an executable, priority-ordered refactoring plan (file-length, long-function, deep-nesting, god-object, high-coupling, and TODO-density heuristics plus a staged runbook).