Changes:
- Delete cfg/setup-claude.sh (MCP setup now manual)
- Remove restore container creation (user manages backups)
- Remove workspace auto-entry from .zshrc
- Remove MCP auto-registration
- Change ai user .zshrc to run claude once on login (not exec)
- User now manually starts containers and registers MCP as needed
New flow:
1. ai user auto-login
2. claude starts once (not exec, returns to shell after exit)
3. User manually starts workspace container if needed
4. User manually registers MCP servers
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