Enhancement: MCP auto-install — discover and install MCP servers

[Delqhi]

Enhancement: MCP Auto-Install

Inspired by

Goose MCP-first, Crush MCP-extensible

What it does

sin-code mcp discover already exists (issue #368), but does not auto-install. Add auto-install capability.

Proposed CLI

sin-code mcp discover              # list available MCP servers (existing)
sin-code mcp install <name>        # install + register + connect
sin-code mcp install --all         # install all discovered servers

Current state

• sin-code mcp discover — lists servers from standard config locations
• sin-code mcp add — manually add server config
• Missing: auto-download + install + register in one command

Priority: Low

Effort: Medium