The TUI SessionPanel banner now uses collapsible \u25b8/\u25be toggle
sections matching the existing Chevron convention used for runtime
agent details. Skills, system prompt, and MCP server lists are
collapsed by default; tools remain expanded as the most actionable
info.
- tui_gateway/server.py: _session_info() now passes agent._cached_system_prompt
through to the TUI frontend
- ui-tui/src/types.ts: added system_prompt?: string to SessionInfo
- ui-tui/src/components/branding.tsx: rewrote SessionPanel with
CollapseToggle helper + per-section useState toggles
Default states: tools=open, skills=collapsed, system=collapsed,
mcp=collapsed. Clicking any \u25b8/\u25be header toggles that section.
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