restructure: rsnix kernel + shell crate + rsdos entry point

Architecture:
  rs-dos/  (workspace root, was raisernics/)
  ├── rsnix/     — kernel lib crate (uefi, serial, gop, ps2, interrupts, memory)
  ├── shell/     — shell lib crate (prompt, commands, line input)
  ├── rsdos/     — binary crate (efi_main, init, panic handler)
  └── rsboot/    — future git submodule

No functional changes — boots to shell prompt identically.
Version auto-pulled from Cargo.toml via env!("CARGO_PKG_VERSION").

1 files changed, 0 insertions, 70 deletions

diff --git a/build.rs b/build.rs
deleted file mode 100644
index 35447e9..0000000
--- a/build.rs
+++ /dev/null
@@ -1,70 +0,0 @@
-/// Build script — extracts glyph data from a PSF2 font file.
-/// Uses zcat (system gzip) to decompress — zero dependencies.
-use std::env;
-use std::fs;
-use std::path::Path;
-use std::process::{Command, Output};
-
-fn main() -> Result<(), Box<dyn std::error::Error>> {
-    let font_path = "/usr/share/kbd/consolefonts/lat1-16.psfu.gz";
-    println!("cargo::rerun-if-changed={}", font_path);
-
-    // Decompress via zcat (available on any Linux system)
-    let Output { stdout, status, .. } = Command::new("zcat").arg(font_path).output()?;
-    if !status.success() {
-        return Err(format!("zcat exited with {status:?}").into());
-    }
-    let raw = stdout;
-
-    if raw.len() < 32 {
-        return Err("PSF font too small".into());
-    }
-
-    // PSF2 magic: 0x864ab572 (little-endian)
-    let magic = u32::from_le_bytes(raw[..4].try_into()?);
-    if magic != 0x864ab572 {
-        return Err("not a PSF2 font".into());
-    }
-
-    let hdr_size = u32::from_le_bytes(raw[8..12].try_into()?) as usize;
-    let num_glyphs = u32::from_le_bytes(raw[16..20].try_into()?) as usize;
-    let bytes_per_glyph = u32::from_le_bytes(raw[20..24].try_into()?) as usize;
-
-    if num_glyphs != 256 {
-        return Err(format!("expected 256 glyphs, got {num_glyphs}").into());
-    }
-    if bytes_per_glyph != 16 {
-        return Err(format!("expected 16 bytes/glyph, got {bytes_per_glyph}").into());
-    }
-
-    let glyph_data = &raw[hdr_size..hdr_size + num_glyphs * bytes_per_glyph];
-
-    // Write generated Rust source into OUT_DIR
-    let out_dir = env::var("OUT_DIR")?;
-    let dest = Path::new(&out_dir).join("font_data.rs");
-
-    let mut code = String::from(
-        "/// 8×16 bitmap font glyph data (256 glyphs, 16 bytes each).
-#[rustfmt::skip]
-#[allow(clippy::unreadable_literal)]
-pub const GLYPH_8X16: [[u8; 16]; 256] = [",
-    );
-
-    for g in 0..256 {
-        let offset = g * 16;
-        code.push_str("\n    [");
-        for row in 0..16 {
-            if row % 4 == 0 {
-                code.push('\n');
-            }
-            let byte = glyph_data[offset + row];
-            code.push_str(&format!(" 0x{byte:02X},"));
-        }
-        code.push_str("\n    ],");
-    }
-
-    code.push_str("\n];\n");
-
-    fs::write(&dest, code)?;
-    Ok(())
-}