feat: add one-click installers for major AI coding clients

[Afloat16]

Summary

Add cross-platform one-command installation for major MCP-capable AI coding clients using a durable shared local runtime.

Supported targets

• OpenAI Codex CLI + IDE extension
• Anthropic Claude Code
• Kimi Code
• ZCode
• Cursor
• Gemini CLI
• Windsurf-compatible user config
• generic ~/.agents/mcp.json
• project-scoped VS Code / Copilot Agent MCP config

User experience

macOS / Linux:

curl -fsSL https://raw.githubusercontent.com/Afloat16/jev-mcp/main/scripts/install.sh | bash -s -- codex

Windows PowerShell:

& ([scriptblock]::Create((irm https://raw.githubusercontent.com/Afloat16/jev-mcp/main/scripts/install.ps1))) -Target codex

The bootstrap installs/updates a managed checkout at ~/.jev-mcp/runtime, builds it with locked dependencies, and points clients at the local Node runtime. Clients therefore do not depend on npm/GitHub at every MCP startup.

Credential safety

• first setup uses hidden terminal input;
• credential is stored only in local ~/.jev-mcp/.env by default;
• AI client MCP configs contain no TypeSafe API key;
• JSON configs are backed up before merge/update;
• installer does not make a live TypeSafe API call.

Validation

• Node 20/22/24 unit/type/build/doc/secret checks;
• isolated Linux bootstrap smoke;
• isolated Windows bootstrap smoke;
• explicit assertions that generated client config contains no TypeSafe credential.

The earlier experimental npm Git-package execution path was removed after CI exposed an npm GitFetcher failure; the final design uses a durable local runtime instead.