feat: add interactive CLI installer for multi-agent rule setup

cli/.gitignore

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+node_modules/
+*.tgz
+aidlc-rules/

cli/README.md

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+# aidlc-install
+
+Interactive CLI installer for [AI-DLC](https://github.com/awslabs/aidlc-workflows) rules across coding agents.
+
+## Usage
+
+```bash
+npx @inariku/aidlc-install
+```
+
+Interactively select which agents to install AI-DLC rules for:
+
+```
+┌  AI-DLC Rules Installer
+│
+◇  Agent Detection
+│  Detected: Kiro, Claude Code
+│
+◆  Select agents to install rules for:
+│  ● Kiro              .kiro/steering/ (detected)
+│  ○ Amazon Q Developer .amazonq/rules/
+│  ○ Cursor IDE        .cursor/rules/ai-dlc-workflow.mdc
+│  ○ Cline             .clinerules/
+│  ● Claude Code       CLAUDE.md (detected)
+│  ○ GitHub Copilot    .github/copilot-instructions.md
+│
+◆  Installation mode:
+│  ● Symlink (recommended)
+│  ○ Copy
+│
+└  Done! Restart your agent to load the new rules.
+```
+
+## Supported Agents
+
+| Agent | Install Path |
+|-------|-------------|
+| Kiro | `.kiro/steering/aws-aidlc-rules` |
+| Amazon Q Developer | `.amazonq/rules/aws-aidlc-rules` |
+| Cursor IDE | `.cursor/rules/ai-dlc-workflow.mdc` |
+| Cline | `.clinerules/core-workflow.md` |
+| Claude Code | `CLAUDE.md` |
+| GitHub Copilot | `.github/copilot-instructions.md` |
+
+## Commands
+
+```bash
+npx @inariku/aidlc-install              # Install rules (interactive)
+npx @inariku/aidlc-install remove       # Uninstall rules
+npx @inariku/aidlc-install list         # Show installed rules
+```
+
+## CI / Non-Interactive
+
+```bash
+npx @inariku/aidlc-install --agent kiro --agent claude --copy -y
+```
+
+| Flag | Description |
+|------|-------------|
+| `-a, --agent <name>` | Target specific agents (repeatable) |
+| `-y, --yes` | Skip prompts |
+| `--copy` | Copy files instead of symlink |
+
+## License
+
+MIT-0

cli/package.json

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+{
+  "name": "@inariku/aidlc-install",
+  "version": "0.1.1",
+  "description": "Interactive installer for AI-DLC rules across coding agents",
+  "license": "MIT-0",
+  "bin": {
+    "aidlc-install": "src/index.mjs"
+  },
+  "type": "module",
+  "files": [
+    "src/",
+    "aidlc-rules/",
+    "README.md"
+  ],
+  "scripts": {
+    "prepack": "cp -R ../aidlc-rules .",
+    "postpack": "rm -rf aidlc-rules"
+  },
+  "dependencies": {
+    "@clack/prompts": "^0.11.0"
+  },
+  "engines": {
+    "node": ">=18"
+  }
+}