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* serial: headless mode tying serial port to stdio for OS debugginggbc dev7 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
* gbctl: 'hud' kills any existing HUD pane before spawning (no double-HUD)gbc dev8 days1-0/+0
gbctl hud now scans tmux for panes started with gbhud.py and kills them before spawning, so there's never more than one HUD (fixes the double-spawn flicker). Added 'gbctl hud --kill' to just tear the HUD down.