v0.8.1

Added

• Added an opt-in structured agent conversation API, advertised through the agent_conversations server capability (off by default) and per-pane conversation_capability/conversation_session snapshot fields. Clients that do not use it are unaffected and the terminal wire protocol is unchanged.
• Added provider-neutral turn, message, plan, tool, file-change, approval, and attachment conversation models with stable opaque IDs, plus live conversation subscriptions and approval responses.
• Added Codex, Claude, Pi, and Oh My Pi transcript adapters that read each provider's own durable session records.
• Added authenticated attachment staging with bounded size and lifetime, and restored-pane conversation identity continuity across server handoff.