Aix Code 0.24.0

• Shared sessions show every subagent (aix v2.26.0). On the phone, the shared view used to fold
  the helpers into one "3 agents working" line. Now each agent has a chip under the header (the
  side list on wider screens) with what it's doing and its task progress; the calls that start or
  message an agent show as cards that open it; and every agent has its own live page — the task it
  was given, its task list, the messages it sent and got, and its activity: reasoning, replies and
  tool calls with their output on tap, plus model, tokens, context and cost. Switch between agents
  from the page; the phone's back button closes it. Finished agents stay openable.
• An agent page loads only while it's open, so sharing stays light for everyone else watching.