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- POST /v1/auth/password|refresh|logout per contract operationIds; long-lived single token (32B hex, DB stores sha256 only), sliding renewal without rotation, logout sets sessions.revokedAt. - SessionGuard: Bearer -> session -> user eligibility (disabled/locked/ pending revoke access); all failures map to 401 AUTH_TOKEN_EXPIRED. - Anti-enumeration: unknown account / wrong password / status-blocked share one 401 AUTH_INVALID_CREDENTIALS; unknown-account path runs a dummy argon2 verify to equalize timing. - Login rate limiting (P1): in-memory account+IP sliding window, 5 failures / 15 min -> 429; success clears. Contract amendment (registered): new ErrorCodes.AUTH_RATE_LIMITED added to errors.ts + openapi Error enum + 429 response on /auth/password; generated types regenerated and committed. P1a single-instance limiter; P5 needs a Redis-backed implementation. - Global ValidationPipe (APP_PIPE) enforces class-validator DTOs -> 400 VALIDATION_FAILED via the existing exception filter. Co-Authored-By: Claude Code <noreply@anthropic.com>