Feature: workspace switcher and Codex CLI health dashboard #84

Research-backed TODO

CodexClaw currently depends on a configured local workdir and Codex CLI command. Mature local agent tools make the active project and runtime health obvious before a run starts.

Acceptance criteria

• Users can add, rename, remove, and switch local workspaces from the app UI.
• Each workspace stores Codex CLI command, workdir, sandbox default, and state directory independently.
• A health panel shows Codex CLI version, auth availability, git repo status, Node/pnpm status, and writable state path.
• Failed checks include copyable fix commands and do not start a Codex run accidentally.

Public research basis

• OpenAI Codex CLI documents local install/auth paths and multiple app surfaces.
• OpenHands documents a Local GUI with REST API and single-page React app.
• Aider’s quickstart starts from an existing codebase path, making the project boundary explicit.

Non-goals

• No hosted workspace sync.
• No multi-user account model.

Source set

• OpenAI Codex CLI - local terminal coding agent, installer paths, IDE/desktop context.
• OpenHands - local GUI with REST API + SPA, CLI, cloud collaboration/integrations.
• Aider - repo maps, git integration, image/web context, lint/test loops.
• Continue - source-controlled AI checks as markdown agents in CI.
• Open SWE - isolated sandboxes, AGENTS.md context, curated tools, subagents, Slack/Linear handoff.
• Model Context Protocol servers - tool/server registry pattern, filesystem/git/memory/fetch examples, security warnings.
• Open WebUI - responsive/PWA UI, RAG/web browsing, artifact storage, permissions.
• OpenCode - coding-agent modes, plan/build separation, subagent pattern.
• Cline - autonomous coding agent as SDK, IDE extension, and CLI assistant.
• Roo Code - agent-oriented coding workflow inside the editor.