refactor: deconsolidate redox.patch into individual patches

The 556MB monolithic redox.patch was impossible to manage, unreviewable,
blocked GitHub pushes, and could only grow. This commit:

- Moves all 64 absorbed patches from absorbed/ to active use in base/
- Removes the absorbed/ directory (consolidation history is now PATCH-HISTORY.md)
- Removes the redox.patch symlink from recipes/core/base/
- Fixes all recipe symlinks to point to active patches (not absorbed/)
- Patches are now individually wired, reviewable, and independently rebasable

The redox.patch mega-file is no longer needed — individual patches
are applied directly from the recipe.toml patches list.

local/patches/base/P0-acpid-dmar-fix.patch

@@ -0,0 +1,19 @@
+diff --git a/drivers/acpid/src/acpi/dmar/mod.rs b/drivers/acpid/src/acpi/dmar/mod.rs
+--- a/drivers/acpid/src/acpi/dmar/mod.rs
++++ b/drivers/acpid/src/acpi/dmar/mod.rs
+@@ -475,8 +475,12 @@ impl<'sdt> Iterator for DmarRawIter<'sdt> {
+             .expect("expected a 2-byte slice to be convertible to [u8; 2]");
+ 
+-        let ty = u16::from_ne_bytes(type_bytes);
+-        let len = u16::from_ne_bytes(len_bytes);
++        let len = u16::from_ne_bytes(len_bytes) as usize;
++
++        if len < 4 {
++            return None;
++        }
++
++        let ty = u16::from_ne_bytes(type_bytes);
+ 
+-        let len = usize::try_from(len).expect("expected u16 to fit within usize");
+ 
+         if len > remainder.len() {