Consolidate ~30 absorbed base patches into surviving carriers. Add
new init service files, driver sources, and network/storage modules
for the base recipe. Move absorbed patches to local/patches/base/absorbed/.
- procmgr.rs: SIGCHLD EPERM → debug (backed by P0-procmgr-sigchld-debug.patch)
- 40_ps2d.service: type notify → oneshot_async (PS/2 doesn't block boot)
Both were working-tree changes flagged by Oracle as not committed.