Kyle Isom 38da2e9a4b Add auth package: MCIAS token validation with caching ...

- Authenticator with Login, ValidateToken, Logout
- 30-second SHA-256-keyed cache with lazy eviction
- TLS 1.3, custom CA support, service context (name + tags)
- Error types: ErrInvalidToken, ErrInvalidCredentials,
  ErrForbidden, ErrUnavailable
- Context helpers for TokenInfo propagation
- 14 tests with mock MCIAS server and injectable clock

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-03-25 14:24:52 -07:00

8.3 KiB

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