fix: major build system improvements and container output issues

- Fix container output visibility with proper TTY handling and debug mode
- Fix build order: kernel modules built before initramfs creation
- Implement two-stage kernel build to resolve chicken-and-egg dependency
- Fix sed command issues in kernel configuration with direct execution
- Add diffutils package to container for proper kernel build support
- Enhance NIC module/firmware correlation with intelligent selection
- Fix module staging logic: all NICs loaded in stage1 before network up
- Add smart firmware installation based on module requirements
- Create comprehensive function documentation (scripts/functionlist.md)
- Add debug container script for troubleshooting

Major fixes:
* Container builds now show real-time output
* Kernel builds work with proper GNU diff support
* Module/firmware selection optimized for common hardware
* Build process handles dependencies correctly
* Documentation provides complete function reference

scripts/lib/docker.sh

@@ -165,9 +165,27 @@ function docker_run_build() {
     
     log_info "Executing build command in container: ${build_command}"
     
+    # Pass through environment variables for proper logging
+    local env_args=""
+    local env_vars=(
+        "DEBUG"
+        "ALPINE_VERSION"
+        "KERNEL_VERSION"
+        "RUST_TARGET"
+        "OPTIMIZATION_LEVEL"
+    )
+    
+    for var in "${env_vars[@]}"; do
+        if [[ -n "${!var:-}" ]]; then
+            env_args="${env_args} -e ${var}=${!var}"
+        fi
+    done
+    
     # Run with privileged access for chroot mounts and system operations
+    log_info "Container environment: ${env_args}"
     safe_execute ${CONTAINER_RUNTIME} run --rm \
         --privileged \
+        ${env_args} \
         -v "${PROJECT_ROOT}:/workspace" \
         -w /workspace \
         "${image}" \