base: Phase J [patch.crates-io] libredox + kstop_enter_s2idle helper

Phase J: add the libredox override to the base's
[patch.crates-io] section so that the libredox fork at
../libredox (which itself uses the local syscall fork
with EnterS2Idle/ExitS2Idle AcPiVerb variants) replaces
the upstream libredox 0.1.17. This breaks the
libredox::error::Error <-> syscall::Error type-identity
barrier that previously caused E0277 errors in
scheme-utils and daemon.

The new scheme.rs method `kstop_enter_s2idle()` is the
typed-AcpiVerb equivalent of writing 's2idle' to
/scheme/sys/kstop. Phase I.5 used the string-arg path
because the syscall extension wasn't usable; Phase J
switches to the typed path now that the local libredox
fork is in place.

Hardware-agnostic: works for any platform with Modern
Standby firmware (Dell, HP, Lenovo, LG Gram, etc.).

Cargo.toml

@@ -145,6 +145,16 @@ precedence = "deny"
 # for any platform with Modern Standby firmware (Dell, HP,
 # Lenovo, LG Gram, etc.).
 redox_syscall = { path = "../syscall" }
+# Red Bear OS Phase J: libredox 0.1.17 has its own vendored
+# redox_syscall dep. Without the libredox override here,
+# libredox::error::Error is the upstream syscall::error::Error
+# (a different compile-time type than the local fork's
+# syscall::Error) and the conversion `?` operator in
+# scheme-utils / daemon fails with E0277. Override libredox
+# to use the local fork at ../libredox/ (which itself uses
+# the local syscall fork). Now libredox::error::Error and
+# syscall::Error are the same type.
+libredox = { path = "../libredox" }
 
 [patch."https://gitlab.redox-os.org/redox-os/relibc.git"]
 #redox-ioctl = { path = "../../relibc/source/redox-ioctl" }