chore: commit durable overlay state (configs, patches, recipe symlinks)

Pre-existing work from other sessions committed as durable state:
- local/config/drivers.d/ (8 driver configs)
- local/config/firmware-fallbacks.d/ (3 firmware configs)
- local/patches/base/, kernel/, relibc/ (new patch carriers)
- recipes/system/ symlinks (driver-params, acmd, ecmd, usbaudiod)

pkgar build artifacts and cache intentionally excluded.

local/config/drivers.d/40-input.toml

@@ -0,0 +1,20 @@
+# Input device drivers
+
+[[driver]]
+name = "ps2d"
+description = "PS/2 keyboard and mouse driver"
+priority = 90
+command = ["/usr/lib/drivers/ps2d"]
+
+[[driver]]
+name = "usbhidd"
+description = "USB HID input driver"
+priority = 75
+command = ["/usr/lib/drivers/usbhidd"]
+# Spawned by USB class matching
+
+[[driver]]
+name = "i2c-hidd"
+description = "I2C HID touchscreen/trackpad driver"
+priority = 75
+command = ["/usr/lib/drivers/i2c-hidd"]