v0.1.0

Added

• Initial release. ccauth — an OAuth2/SSO credential helper that authenticates
  Claude Code to AI gateways through its apiKeyHelper hook, so developers never
  hand-manage API keys.
• Identity providers: Microsoft Entra ID, Google Workspace, and generic OIDC
  (Okta / Auth0 / Keycloak), via a single OIDC engine with provider presets.
• Gateways: LiteLLM, Portkey, Bifrost, and any OIDC-aware gateway, with two
  credential modes — passthrough (emit the raw SSO JWT) and exchange (trade it
  for a gateway-native key via RFC 8693 or a broker).
• Interactive login (authorization code + PKCE + loopback, or device-code)
  split from a fast, silent token helper that returns cached tokens, refreshes
  silently, and opens a browser to re-authenticate when the refresh token expires.
• Layered configuration (user < embedded < managed < remote) for zero-config
  enterprise rollout, with allow_user_profiles lockdown and ccauth config /
  config sync commands.
• Secure storage: refresh token in the OS keychain (macOS Keychain, Windows
  Credential Manager, Linux Secret Service) with a 0600-file fallback.
• Commands: setup, init, login, token, logout, status, wire,
  config, doctor, gateways.
• Reference material: DESIGN.md, ENTERPRISE.md, LiteLLM and Portkey
  examples, a Bifrost edge-auth plugin, and a token-exchange broker contract.