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* serial: headless mode tying serial port to stdio for OS debugginggbc dev6 days1-0/+0
| | | | | | | | - --headless: no rendering/TUI; serial TX -> stdout, RX <- stdin (nonblocking) - generalize serial: serial_out_fd/serial_in_fd on the GB; internal-clock transfer now shifts in a real RX byte (from stdin) instead of always 0xFF - paced to native speed by default, --uncapped for turbo; pipes/scripts cleanly - README: document headless serial console
* gbhud: live joypad display (cute Game Boy layout, buttons light up)gbc dev7 days1-0/+0
New INPUT section reads hJoyHeld (0xFFB4) and draws a d-pad cross + A/B circles + SEL/START pills; held buttons glow bright green, idle ones dim grey.