[Bug] Interactive TUI pickers freeze on input handling (regression in 2.1.115-2.1.119)

Bug Description
Bug: Interactive TUI pickers completely freeze (regression in 2.1.115-2.1.119) Version: Reproduced on 2.1.119. Confirmed NOT present on 2.1.114. Platform: macOS 26.4, Mac Studio M3, Terminal.app Affected commands: /mcp (Manage MCP servers), /rewind (conversation rewind picker). Likely all interactive picker/selector menus. Symptoms: - Picker menu renders correctly with full list - Arrow keys have no effect (cursor doesn't move) - Enter does not confirm, Esc does not cancel - Ctrl+C has no effect - Terminal process is still running (closing terminal prompts "are you sure?") - Only way out is killing the terminal - Happens 100% of the time, not intermittent Environment: 24 MCP servers configured (some failing: multi-agent-coordinator, pdf-tools). However, the freeze occurs regardless of MCP state - it affects the picker input handling, not the server connections. Regression confirmed: Downgrading to 2.1.114 via npm install -g @anthropic-ai/claude-code@2.1.114 immediately…
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