asc v0.1.4

Added

• Persistent Auth Login: Save API key credentials to ~/.asc/credentials.json so environment variables are not required on every session.
  • asc auth login --key-id <id> --issuer-id <id> --private-key-path <path> — save credentials to disk
  • asc auth logout — remove saved credentials
  • asc auth check — verify credentials and show their source (file or environment)
  • Credential resolution order: ~/.asc/credentials.json → environment variables (fully backwards-compatible)
  • asc auth check now outputs JSON with an affordances field (same agent-first format as all other commands)

Technical

• Added AuthStorage @Mockable protocol (save, load, delete) in Domain
• Added AuthStatus domain model (keyID, issuerID, source: CredentialSource) with AffordanceProviding
• Added CredentialSource enum (.file / .environment) as Codable String raw value
• AuthCredentials gains Codable conformance for JSON file serialization
• FileAuthStorage (Infrastructure) reads/writes ~/.asc/credentials.json using JSONEncoder/JSONDecoder
• FileAuthProvider (Infrastructure) implements AuthProvider backed by FileAuthStorage
• CompositeAuthProvider (Infrastructure) tries file credentials first, falls back to EnvironmentAuthProvider
• ClientProvider updated to use CompositeAuthProvider — all existing commands gain file-based auth transparently