The all-in-one council_query tool returned everything as a single blob,
preventing the iOS app from displaying individual model responses as
separate content blocks. By removing it, the agent must now use:
- council_stage1_collect (individual responses)
- council_stage2_rank (peer rankings)
- council_stage3_synthesize (final synthesis)
Each stage call generates a separate tool_result, enabling granular
display in the UI.
