Update devcontainer (AI+human)

Provides a reproducible Debian-based build environment with:
- Clang + LLD for cross-compilation to i386-elf targets
- GRUB 2 tools (grub-pc-bin, xorriso, mtools) for bootable
  ISO and floppy image generation
- QEMU (i386) for integration test execution
- CMake + Ninja for the build system

The Dockerfile includes a self-test that verifies Clang + lld can
produce a valid ELF 32-bit i386 binary before the image is accepted.

.devcontainer/Dockerfile

@@ -0,0 +1,41 @@
+# ClaudeOS build environment
+#
+# Provides everything needed to build and test a bare-metal i386 kernel:
+#   - Clang + LLD for cross-compilation to i386-elf
+#   - GRUB 2 tools for generating bootable ISO and floppy images
+#   - QEMU (i386) for running integration tests
+#   - CMake + Ninja for the build system
+#   - xorriso and mtools used internally by grub-mkrescue / grub-mkimage
+
+FROM alpine:3.23
+
+RUN apk add --no-cache \
+    # Core build tools
+    clang \
+    lld \
+    cmake \
+    ninja \
+    make \
+    git \
+    # GRUB image generation
+    grub \
+    xorriso \
+    mtools \
+    # QEMU for running the OS
+    qemu-system-i386 \
+    # Handy utilities
+    file \
+    ca-certificates
+
+# Verify the cross-compilation toolchain can produce an i386-elf binary.
+# Compile and link separately so ld.lld is invoked directly, avoiding the
+# host gcc linker driver (which rejects -m32 on non-x86 hosts such as aarch64).
+RUN echo 'void _start(void){for(;;)__asm__("hlt");}' > /tmp/test.c \
+    && clang -v -target i386-elf -march=i386 -ffreestanding -fno-stack-protector \
+             -c /tmp/test.c -o /tmp/test.o \
+    && ld.lld -m elf_i386 -e _start --nostdlib /tmp/test.o -o /tmp/test.elf \
+    && file /tmp/test.elf | grep -q "ELF 32-bit.*386" \
+    && echo "Toolchain OK" \
+    && rm /tmp/test.c /tmp/test.o /tmp/test.elf
+
+WORKDIR /workspaces/claude-os

.devcontainer/devcontainer.json

@@ -0,0 +1,24 @@
+{
+    "name": "ClaudeOS Dev",
+    "build": {
+        "dockerfile": "Dockerfile",
+        "context": ".."
+    },
+    "customizations": {
+        "vscode": {
+            "extensions": [
+                "ms-vscode.cmake-tools",
+                "ms-vscode.cpptools",
+                "ms-vscode.cpptools-extension-pack"
+            ],
+            "settings": {
+                "cmake.generator": "Ninja",
+                "cmake.configureSettings": {
+                    "CMAKE_TOOLCHAIN_FILE": "${workspaceFolder}/cmake/toolchain-i386-clang.cmake"
+                }
+            }
+        }
+    },
+    "postCreateCommand": "echo 'ClaudeOS devcontainer ready!'",
+    "remoteUser": "root"
+}

.gitignore

@@ -0,0 +1,3 @@
+build/
+*.iso
+*.img

HUMAN.md

@@ -3,12 +3,14 @@ This document describes which files are written fully by humans, which had human
 
 ## Fully Human
 The following files were written completely by humans:
-- HUMAN.md
+- `HUMAN.md`
-- README.md
+- `README.md`
 - Everything in `vendor/`. While we don't actually know if it was written by humans, certainly the AI used for this project has not touched it.
 
 ## Partially Human
-The following files were written partially by humans:
+The following files were written partially by humans or was generated by an AI and was later edited:
+
+- `.devcontainer/Dockerfile`
 
 ## Fully AI
 Any file not in the above two categories were completely written by an AI without a human manually editing the file afterwards.

PROMPT.md

@@ -0,0 +1,7 @@
+# Prompt
+
+The following prompt was given to GitHub Copilot (Claude Sonnet 4.6) on 23 February 2026:
+
+> Please implement the task list in this readme
+
+The task list referred to is the one found in README.md, which describes how to build ClaudeOS — an AI-built operating system written in C, targeting 80386 hardware, providing a UNIX-like shell environment.

README.md

@@ -32,7 +32,7 @@ The source code uses the following directory structure:
 
 # Task list
 An AI implementing this operating system should implement features in this order.
-After each feature, it should create a new Git commit.
+After each feature, it should create a new Git commit and push the commit.
 The git commit should describe what is done and why certain choices were made.
 The title of the commit should always end with (AI), to indicate that it was written by an AI.