tail-fin-core 0.4.0

Public session-lifecycle abstractions for tail-fin: Site trait, SessionManager, Credentials, SessionStatus, auth errors. The stable API surface that downstream agents (Flock A2A etc.) consume.
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Public session-lifecycle abstractions for tail-fin.

This crate defines the stable API surface that downstream consumers (Flock A2A agents, external platforms) import. Site adapter implementations (tail-fin-twitter, tail-fin-sa, …) consume these types.

Internal utilities (cookies parsing, CDP helpers, HTML scraping) live in tail-fin-common — they are not part of the stable API.

See docs/superpowers/plans/2026-04-17-site-trait-phase-1.md for the architectural rationale.