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.

recipes/system/driver-params

@@ -0,0 +1 @@
+../../local/recipes/system/driver-params

recipes/system/redbear-acmd

@@ -0,0 +1 @@
+../../local/recipes/system/redbear-acmd

recipes/system/redbear-ecmd

@@ -0,0 +1 @@
+../../local/recipes/system/redbear-ecmd

recipes/system/redbear-usbaudiod

@@ -0,0 +1 @@
+../../local/recipes/system/redbear-usbaudiod