refactor(deploy): share UP Board serial hardware between installed + live ISO

The sintra live ISO (live.nix) had no serial support — ftdi_sio and the
ttyJ5/ttyJ7 udev symlinks were only in hardware/upboard.nix (installed), so
booting iso-sintra on real hardware failed on the validator + F56 dispenser
while the disk image worked. The two definitions had already drifted (live's
tejo block lacked ttyS4).

Extract the UP Board serial peripherals (usbserial/ftdi_sio/cp210x, the
ttyJ4/ttyJ5/ttyJ7 udev symlinks + permissions, console=tty0) into
hardware/upboard-serial.nix and import it from both upboard.nix (installed
tejo + sintra) and live.nix (sintra only). Single source of truth — the two
artifacts can't drift again. Named upboard-serial (not sintra-serial) since
upboard.nix serves both tejo-installed and sintra-installed.

Camera + LED/SPI rules stay inline in upboard.nix (installed-specific; the
pairing camera works via getUserMedia without the scanner symlink). Verified
by eval: live sintra now carries ftdi_sio + console=tty0 + ttyJ7; installed
sintra/tejo unchanged (serial present, camera present, no console dupe).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

deploy/nixos/hardware/upboard-serial.nix

@@ -0,0 +1,61 @@
+# UP Board serial peripherals — the validator / dispenser / printer wiring
+# shared by the INSTALLED configs (hardware/upboard.nix, used by both
+# tejo-installed and sintra-installed) AND the sintra live ISO (live.nix).
+# Single source of truth so the two artifacts can't drift — the earlier bug
+# was exactly this drift (the sintra live ISO lacked ftdi_sio + the ttyJ7
+# symlink, so the F56 dispenser failed while the installed image worked).
+#
+# Sintra IS a UP Board, so these are the UP Board rules; ttyS1/ttyS5 cover the
+# older UP Board / UP4000 (Tejo) dispenser nodes and ttyS4 covers the Sintra
+# (Apollo Lake) where the F56 is on the SoC MMIO UART. Only the device that
+# actually exists at runtime gets the symlink, so all three coexist safely.
+#
+# Serial port mapping:
+#   ttyJ4 = Printer (Nippon NP-2511D-2)
+#   ttyJ5 = Validator (iVIZION, ID003)
+#   ttyJ7 = Dispenser (Fujitsu F53/F56)
+{ lib, ... }:
+
+{
+  boot.kernelModules = [
+    "usbserial" # USB-to-serial adapters
+    "ftdi_sio" # FTDI USB serial (the iVIZION validator bridge)
+    "cp210x" # CP210x USB serial (alternative adapter)
+  ];
+
+  boot.kernelParams = [
+    # Do NOT route the kernel console through ttyS4 on Sintra. ttyS4 is the
+    # SoC's MMIO 16550A (the only real UART besides the legacy ttyS0 at I/O
+    # 0x3f8) and is wired to the Fujitsu F56 dispenser's RS-232 header. Holding
+    # it as console prevents userspace opening it at 9600 baud and HAL fails
+    # with "Input/output error setting custom baud rate of 9600". For serial
+    # debug, point console at ttyS0 instead.
+    "console=tty0"
+  ];
+
+  services.udev.extraRules = lib.mkAfter ''
+    # Generic serial port permissions (so the non-root HAL user can open them)
+    KERNEL=="ttyS[0-9]*", MODE="0666"
+    KERNEL=="ttyUSB[0-9]*", MODE="0666"
+    KERNEL=="ttyACM[0-9]*", MODE="0666"
+
+    # Printer (ttyJ4)
+    KERNELS=="1-7.2:1.0", SYMLINK+="ttyJ4"
+    KERNEL=="ttyUSB0", SYMLINK+="ttyJ4"
+
+    # Validator (ttyJ5)
+    KERNELS=="1-7.3:1.0", SYMLINK+="ttyJ5"
+    KERNEL=="ttyUSB1", SYMLINK+="ttyJ5"
+
+    # Dispenser (ttyJ7). ttyS1/ttyS5 = older UP Board / UP4000; ttyS4 = Sintra.
+    KERNEL=="ttyS1", SYMLINK+="ttyJ7"
+    KERNEL=="ttyS4", SYMLINK+="ttyJ7"
+    KERNEL=="ttyS5", SYMLINK+="ttyJ7"
+
+    # Legacy ttyAMA0 alias
+    SUBSYSTEM=="tty", KERNEL=="ttyS1", SYMLINK+="ttyAMA0", GROUP="dialout"
+
+    # Disable USB autosuspend (prevents serial adapters from sleeping)
+    ACTION=="add", SUBSYSTEM=="usb", TEST=="power/control", ATTR{power/control}="on"
+  '';
+}