agent-session-kit 0.6.1

A task notification is not an instruction, and Fable 5 has a million-token
window.

Fixed

• HumanPromptText strips Claude Code's background-task envelopes. A
  subagent's completion arrives as a user turn wrapped in <task-notification>
  (<task-id>, <tool-use-id>, <output-file>, <status>, <summary>,
  <result>) and a peer message in <cross-session-message>; a session whose
  first "prompt" was one of those showed the XML as its assignment.
• ModelContextWindows.standard knows claude-fable-5 and claude-mythos-5
  are 1M-token models without a [1m] marker — Claude Code's own /context
  panel reports them so. A derived fill that read 425 % was this.