New tools for hardware control:
- get_modem_lines: read all input (CTS/DSR/RI/CD) and output (RTS/DTR) lines
- set_modem_lines: set RTS/DTR states
- pulse_line: pulse RTS or DTR for reset sequences (ESP32, Arduino, etc.)
- send_break: send serial break signal
Also added RI and CD to get_connection_status and port status resource.
FastMCP server for serial port access via Model Context Protocol:
- 10 tools: list, open, close, read, write, configure, flush, status
- 4 dynamic resources: ports list, data, status, raw hex
- USB device filtering (hides phantom ttyS ports by default)
- Full pyserial support with configurable baudrate/parity/etc
