Initial commit: DarkForge Linux — Phases 0-12

Complete from-scratch Linux distribution targeting AMD Ryzen 9 9950X3D +
NVIDIA RTX 5090 on ASUS ROG CROSSHAIR X870E HERO.

Deliverables:
- dpack: custom package manager in Rust (3,800 lines)
  - TOML package parser, dependency resolver, build sandbox
  - CRUX Pkgfile and Gentoo ebuild converters
  - Shared library conflict detection
- 124 package definitions across 4 repos (core/extra/desktop/gaming)
- 34 toolchain bootstrap scripts (LFS 13.0 adapted for Zen 5)
- Linux 6.19.8 kernel config (hardware-specific, fully commented)
- SysVinit init system with rc.d service scripts
- Live ISO builder (UEFI-only, squashfs+xorriso)
- Interactive installer (GPT partitioning, EFISTUB boot)
- Integration test checklist (docs/TESTING.md)

No systemd. No bootloader. No display manager.
Kernel boots via EFISTUB → auto-login → dwl Wayland compositor.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

toolchain/scripts/003-linux-headers.sh

@@ -0,0 +1,45 @@
+#!/bin/bash
+# ============================================================================
+# DarkForge Linux — Phase 0, Chapter 5: Linux API Headers
+# ============================================================================
+# Purpose:  Install the Linux kernel API headers into the target sysroot.
+#           These headers define the kernel-userspace interface that glibc
+#           needs to compile against. We use kernel 6.19.8 to match our
+#           target kernel version.
+# Inputs:   ${LFS}/sources/linux-6.19.8.tar.xz
+# Outputs:  Kernel headers in ${LFS}/usr/include/
+# Assumes:  Running as 'lfs' user
+# Ref:      LFS 13.0 §5.4
+# ============================================================================
+
+set -euo pipefail
+source "${LFS}/sources/darkforge-env.sh"
+
+PACKAGE="linux"
+VERSION="6.19.8"
+SRCDIR="${LFS}/sources"
+
+echo "=== Installing ${PACKAGE}-${VERSION} API Headers ==="
+
+cd "${SRCDIR}"
+tar -xf "${PACKAGE}-${VERSION}.tar.xz"
+cd "${PACKAGE}-${VERSION}"
+
+# Clean any stale files or configurations
+make mrproper
+
+# Generate the sanitized kernel headers
+# The 'headers' target produces userspace-safe versions of kernel headers
+make headers
+
+# Remove non-header files from the generated output
+find usr/include -type f ! -name '*.h' -delete
+
+# Install headers to target sysroot
+cp -rv usr/include "${LFS}/usr"
+
+# Cleanup
+cd "${SRCDIR}"
+rm -rf "${PACKAGE}-${VERSION}"
+
+echo "=== ${PACKAGE}-${VERSION} API Headers installed ==="