Add AI Stack with Claude, LangChain, and multi-provider support

[Copilot]

Adds comprehensive AI toolkit infrastructure with Claude/Anthropic as the primary provider, LangChain framework integration, and multi-provider support (OpenAI, Cohere, Vercel AI SDK).

Changes

Dependencies

• @anthropic-ai/sdk ^0.20.0 - Claude 3 models (Opus/Sonnet/Haiku)
• langchain ^0.3.80, @langchain/anthropic ^0.3.0 - LangChain framework with Claude integration
• openai ^4.28.0, cohere-ai ^7.7.0, ai ^6.0.49 - Additional AI providers
• All added as optional dependencies to preserve base installation size

Configuration (src/config/index.ts)

• Added type-safe Zod schemas for Claude, LangChain, and multi-provider settings
• Environment variables: CLAUDE_*, LANGCHAIN_*, OPENAI_API_KEY, COHERE_API_KEY

Security

• Addressed LangChain serialization injection vulnerabilities (4 CVEs) by upgrading to patched version
• Fixed Vercel AI SDK file upload bypass and XSS vulnerabilities

Dependency Management

• Updated Renovate to group AI dependencies with monthly update schedule

Usage

import Anthropic from '@anthropic-ai/sdk';
import { ChatAnthropic } from '@langchain/anthropic';
import { loadConfig } from './config';

const config = loadConfig();

// Direct Claude API
const anthropic = new Anthropic({ apiKey: config.claude.apiKey });
const message = await anthropic.messages.create({
  model: 'claude-3-opus-20240229',
  max_tokens: 4096,
  messages: [{ role: 'user', content: 'Hello' }]
});

// LangChain integration
const model = new ChatAnthropic({
  anthropicApiKey: config.claude.apiKey,
  modelName: 'claude-3-opus-20240229'
});

Configuration

# Claude
CLAUDE_ENABLED=true
CLAUDE_API_KEY=sk-ant-***
CLAUDE_MODEL=claude-3-opus-20240229
CLAUDE_MAX_TOKENS=4096

# LangChain
LANGCHAIN_ENABLED=true
LANGCHAIN_TRACING_V2=true
LANGCHAIN_API_KEY=ls__***

Original prompt

Add a full AI Stack of AI tools and toolkits with Claude to the list of upgrades and updates For this repository.

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