aix CLI 2.26.0

• Shared sessions show every subagent (/share; Aix Code v0.24.0: the Share button). The
  viewer used to collapse the helpers into one line ("3 agents working") behind the phone's task
  bar. Now:
  • Agent chips under the header on phones (the side list on wider screens): each agent with
    what it's doing now and its own task progress.
  • Agent cards in the conversation: the call that started a helper opens it; calls that wait
    on one or write to one link to it too.
  • An agent page for each helper, live: the task it was given, its own task list, the
    messages it sent and got, and its activity — reasoning, replies, tool calls with their output
    on tap — plus model, tool calls, tokens, context and cost. Switch between agents from the page;
    the phone's back button closes it. Finished agents stay openable, with how they ended.
• Light on the network: an agent page is fetched only while it's open (about once a second; an
  unchanged agent answers with an empty reply), never pushed to every viewer.
• Cost and cache-savings estimates are unchanged; nothing about what the agents do changes.