[Integrations] Add Zerodha (Kite) integration (Kite Connect + MCP)

Description

Add a Zerodha Kite (Kite Connect) integration so CORE can read a user’s trading account (holdings/positions/orders) and track meaningful events over time.

This is a strong candidate for an integration because Zerodha provides an official developer platform (Kite Connect) and also maintains an official MCP server.

Reference Implementations

• Kite Connect (official docs): https://kite.trade/docs/connect/v3/
• Kite Connect API reference: https://kite.trade/docs/connect/v3/user/
• Official SDKs (examples): https://kite.trade/docs/connect/v3/libraries/
• Zerodha Kite MCP server (official): https://github.com/zerodha/kite-mcp-server
• Hosted MCP endpoint (if available): https://mcp.kite.trade (verify)

Required Files Structure

packages/core/src/integrations/zerodha-kite/
  index.ts
  client.ts
  types.ts
  mappers.ts
  auth.ts
  README.md
packages/core/src/integrations/zerodha-kite/__tests__/
  zerodha-kite.test.ts

Kite Integration

Auth

• OAuth-like flow with request token → access token
• Persist access token securely; handle expiry/rotation
• Support re-auth when token is invalid

Core Endpoints

• User profile
• Holdings: GET /portfolio/holdings
• Positions: GET /portfolio/positions
• Orders: GET /orders
• Trades: GET /trades
• Instruments master (optional, for symbol metadata)

Events to Track

• New order placed
• Order executed
• Order cancelled
• New position opened
• Position closed
• Large trade (over threshold)

Implementation Tasks

• Add integration scaffold + types
• Implement auth flow (request token → access token)
• Implement API client (REST)
• (Optional) Implement MCP client if we want MCP-first
• Map responses → CORE canonical schema
• Add scheduled sync + delta logic
• Emit events into memory store
• Add docs + README
• Add tests

Technical Notes

• Kite Connect has rate limits; respect backoff and avoid aggressive polling.
• Confirm which plan is required for API access and document pricing constraints.

Resources

• GitHub issue #180 (PostHog integration pattern): https://github.com/RedPlanetHQ/core/issues/180

Labels

• integrations
• good first issue
• coding