## Why
Bedroom developers currently must write raw HTTP calls to use AgentIdP. A Node.js SDK removes that friction — developers install one package and get a fully typed, auto-authenticating client. This is a Phase 1 P1 deliverable and a core developer experience improvement.

## What Changes
- New `sdk/` directory at project root containing a self-contained TypeScript npm package
- `AgentIdPClient` class: handles auth, token refresh, and exposes typed methods for all 14 endpoints
- Covers all four services: AgentRegistry, Credentials, Token, AuditLog
- Full TypeScript types — zero `any`, strict mode
- Published as `@sentryagent/idp-sdk` (package name)

## What Does Not Change
- No API changes
- No changes to the main application source
