Update installer patch for GRUB bootloader and ext4 filesystem support

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

local/patches/installer/redox.patch

@@ -163,9 +163,18 @@ index 2739983..0d2d6f3 100644
      let res = with_whole_disk(&disk_path, &disk_option, |mut fs| {
          // Fast install method via filesystem clone
 diff --git a/src/config/general.rs b/src/config/general.rs
-index 417ff2d..4ad2202 100644
+index 417ff2d..fab677c 100644
 --- a/src/config/general.rs
 +++ b/src/config/general.rs
+@@ -6,7 +6,7 @@ pub struct GeneralConfig {
+     pub prompt: Option<bool>,
+     /// Total filesystem size in MB
+     pub filesystem_size: Option<u32>,
+-    /// EFI partition size in MB, default to 2MB
++    /// EFI partition size in MiB, defaults to 1 MiB when not set
+     pub efi_partition_size: Option<u32>,
+     /// Skip disk partitioning, assume whole disk is a partition
+     pub skip_partitions: Option<bool>,
 @@ -19,6 +19,11 @@ pub struct GeneralConfig {
      /// Use AR to write files instead of FUSE-based mount
      /// (bypasses FUSE, but slower and requires namespaced context such as "podman unshare")
@@ -191,7 +200,7 @@ index 417ff2d..4ad2202 100644
      }
  }
 diff --git a/src/installer.rs b/src/installer.rs
-index 4e077a9..654f6fb 100644
+index 4e077a9..ba3f9dd 100644
 --- a/src/installer.rs
 +++ b/src/installer.rs
 @@ -3,6 +3,13 @@ use anyhow::{bail, Result};
@@ -478,7 +487,7 @@ index 4e077a9..654f6fb 100644
      let bootloader_dir =
          PathBuf::from(format!("/tmp/redox_installer_bootloader_{}", process::id()));
  
-@@ -491,36 +739,75 @@ pub fn fetch_bootloaders(
+@@ -491,39 +739,78 @@ pub fn fetch_bootloaders(
  
      fs::create_dir(&bootloader_dir)?;
  
@@ -579,7 +588,20 @@ index 4e077a9..654f6fb 100644
 +    result
  }
  
- //TODO: make bootloaders use Option, dynamically create BIOS and EFI partitions
+-//TODO: make bootloaders use Option, dynamically create BIOS and EFI partitions
++//TODO: dynamically create BIOS and EFI partitions instead of always creating both
+ pub fn with_whole_disk<P, F, T>(disk_path: P, disk_option: &DiskOption, callback: F) -> Result<T>
+ where
+     P: AsRef<Path>,
+@@ -570,7 +857,7 @@ where
+     let gpt_reserved = 34 * 512; // GPT always reserves 34 512-byte sectors
+     let mibi = 1024 * 1024;
+ 
+-    // First megabyte of the disk is reserved for BIOS partition, wich includes GPT tables
++    // First megabyte of the disk is reserved for BIOS partition, which includes GPT tables
+     let bios_start = gpt_reserved / block_size;
+     let bios_end = (mibi / block_size) - 1;
+ 
 @@ -672,10 +959,13 @@ where
              fscommon::StreamSlice::new(&mut disk_file, disk_efi_start, disk_efi_end)?;
  
@@ -893,7 +915,7 @@ index 4e077a9..654f6fb 100644
  #[cfg(not(target_os = "redox"))]
  pub fn try_fast_install<D: redoxfs::Disk, F: FnMut(u64, u64)>(
      _fs: &mut redoxfs::FileSystem<D>,
-@@ -801,6 +1348,24 @@ pub fn try_fast_install<D: redoxfs::Disk, F: FnMut(u64, u64)>(
+@@ -801,6 +1348,27 @@ pub fn try_fast_install<D: redoxfs::Disk, F: FnMut(u64, u64)>(
  
  fn install_inner(config: Config, output: &Path) -> Result<()> {
      println!("Installing to {}:\n{}", output.display(), config);
@@ -912,13 +934,16 @@ index 4e077a9..654f6fb 100644
 +            if efi_size < 8 {
 +                bail!("GRUB bootloader requires efi_partition_size >= 8 MiB (got {} MiB). Add efi_partition_size = 16 to your config.", efi_size);
 +            }
++            if config.general.skip_partitions.unwrap_or(false) {
++                bail!("GRUB bootloader is incompatible with skip_partitions = true. GRUB requires GPT partition layout with ESP for chainloading.");
++            }
 +        }
 +    }
 +
      let cookbook = config.general.cookbook.clone();
      let cookbook = cookbook.as_ref().map(|p| p.as_str());
      if output.is_dir() {
-@@ -823,28 +1388,42 @@ fn install_inner(config: Config, output: &Path) -> Result<()> {
+@@ -823,28 +1391,45 @@ fn install_inner(config: Config, output: &Path) -> Result<()> {
          let live = config.general.live_disk.unwrap_or(false);
          let password_opt = config.general.encrypt_disk.clone();
          let password_opt = password_opt.as_ref().map(|p| p.as_bytes());
@@ -928,6 +953,9 @@ index 4e077a9..654f6fb 100644
          if let Some(write_bootloader) = &config.general.write_bootloader {
 -            std::fs::write(write_bootloader, &bootloader_efi)?;
 +            let primary_efi = grub_efi.as_deref().unwrap_or(&bootloader_efi);
++            if primary_efi.is_empty() {
++                bail!("Cannot write bootloader to {:?}: EFI binary is empty (0 bytes). The recipe may have failed to produce a valid image.", write_bootloader);
++            }
 +            std::fs::write(write_bootloader, primary_efi)?;
          }
 +        let filesystem_type = match config.general.filesystem.as_deref() {