54d3ad1ede
This addresses #16038 The default `tui_app_server` path stopped surfacing MCP startup failures during cold start, even though the legacy TUI still showed warnings like `MCP startup incomplete (...)`. The app-server bridge emitted per-server startup status notifications, but `tui_app_server` ignored them, so failed MCP handshakes could look like a clean startup. This change teaches `tui_app_server` to consume MCP startup status notifications, preserve the immediate per-server failure warning, and synthesize the same aggregate startup warning the legacy TUI shows once startup settles.
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