ChimpFlow 0.1.2 — /skill integration guide for app-building agents

Adds 'Adding ChimpFlow to your app' to the /skill/ self-describing contract:
key provisioning/minting practice (least-privilege, rawKey-once), runtime
discovery via /v1/models, deliberate 401/403/502 handling, /healthz
preflight, localhost discipline, OpenAI-SDK base_url pointer. Endpoint
embedded version synced to 0.1.1. Global skill at ~/.agents/skills/chimpflow
mirrors the guide.