feat(devcontainer): add claude-cli feature

[VAIBHAVSING]

Summary

Add DevContainer feature for Claude CLI - a command-line interface for Anthropic's Claude AI.

What this adds

• Full-featured bash wrapper for Anthropic's Claude API
• Support for all Claude 3 models (Opus, Sonnet, Haiku)
• Shell completion for bash and zsh
• Flexible input via command arguments or stdin
• System prompt support for behavior customization
• Comprehensive error handling and JSON parsing

Usage examples

# Basic usage
claude "What is a DevContainer?"

# Pipe input
git diff | claude "Review this code"

# Specify model and system prompt
claude --model claude-3-opus-20240229 \
       --system "You are a code reviewer" \
       "Review my changes"

Part of stacked PRs

This is PR #2 in a stack that implements DevContainer features for Dev8:

• PR feat: authentication added with nextauth.js and adds readme #1: Supervisor feature ✓
• PR Feat: Fix linting issue and add CI workflows #2: Claude CLI feature (this PR)
• PR feat: added ci and fixes monorepo #3: AI tools bundle (next)
• PR Add comprehensive context.md for AI agents #4: Agent integration

Stack order: This PR is based on feat/devcontainer-supervisor-feature

Testing

Test locally with:

{
  "features": {
    "./packages/devcontainer-features/src/claude-cli": {
      "installShellCompletion": true
    }
  }
}

Then set your API key and test:

export ANTHROPIC_API_KEY="your-key"
claude "Hello, Claude!"

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/devcontainer-claude-cli-feature

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