docs: describe the firmware that exists; ship the NXP firmware EULA

README: replace the stalled REST/GUI roadmap with what the firmware does -
GRBL mode over TCP for LightBurn/UGS/cncjs, optional cloud mode, the web
control panel, cameras, A/B install beside the factory firmware - plus the
supported hardware incl. the 8 MP camera limitation and a real roadmap.

kas/README: xvclk is the board's 24 MHz oscillator; the pin/push rule covers
every source repo; camera and motion sections are hardware-validated, with the
OV8856 caveat spelled out; the device-tree item closes with the control_12v
residue named; forgectrl is the machine-services daemon with two supervised
controllers.

LIGHTBURN.md: drop the pre-first-light status line.

BUILD.md: state the NXP firmware licensing and where the EULA lives on the
machine. The image now installs firmware-imx-lic, so the EULA text ships beside
the VPU/EPDC blobs it covers; a bbappend declares that package at parse time,
which is what makes it installable from an image recipe.

meta-forgefirm/recipes-forgefirm/images/forgefirm-image.bb

@@ -25,6 +25,11 @@ IMAGE_INSTALL:remove = "gfui-client"
 # slotmigrate: boot-time reclaim of the legacy p4 layout (grows /data).
 IMAGE_INSTALL:append = " grblhal-glowforge forgectrl gfhome gfcloud v4l-utils fwup ffboot slotmigrate"
 
+# NXP's firmware EULA covers the i.MX VPU/EPDC blobs the BSP installs, so the
+# image ships the license text with them (/usr/share/licenses/firmware-imx).
+# The SDMA firmware brings its own -license package through linux-firmware.
+IMAGE_INSTALL:append = " firmware-imx-lic"
+
 # The release rootfs must fit a 200 MiB factory eMMC slot (409600 blocks).
 # Sizing: content + 40 MiB working space, hard-capped at the slot size —
 # the build fails rather than emit an unflashable image. The raw ext4 is