Fix critical build pipeline and update documentation

CRITICAL FIXES:
- Fix build-initramfs.sh early exit preventing zinit installation
- Add binary detection/installation logic to setup-initramfs.sh
- Ensure compiled components are properly installed to initramfs

DOCUMENTATION:
- Update README.md to reflect actual implementation
- Document source compilation approach with git submodules
- Add development workflow and caching documentation
- Remove outdated GitHub releases references

This fixes the 'zinit not found' boot error by ensuring the build
pipeline completes all phases including initramfs assembly.

scripts/build-initramfs.sh

@@ -42,7 +42,6 @@ echo "[+] Compiling Zero-OS components..."
 if [ -f /build/scripts/build-smart.sh ]; then
     # Use smart build if available (with caching)
     /build/scripts/build-smart.sh
-    exit $?
 else
     # Fallback to direct component compilation
     /build/scripts/compile-components.sh

scripts/setup-initramfs.sh

@@ -85,6 +85,50 @@ EOF
 
 chmod +x "$INITRAMFS_ROOT/init-debug"
 
+# Ensure compiled Zero-OS binaries are installed
+echo "  Checking Zero-OS binaries..."
+echo "[DEBUG] Checking for compiled binaries..."
+
+# Check if binaries exist and copy them if needed
+BINARIES_FOUND=true
+
+# Check zinit (critical for boot)
+if [ ! -f "$INITRAMFS_ROOT/sbin/zinit" ]; then
+    if [ -f "/build/output/zinit" ]; then
+        echo "    Installing zinit from output directory..."
+        mkdir -p "$INITRAMFS_ROOT/sbin"
+        cp "/build/output/zinit" "$INITRAMFS_ROOT/sbin/"
+        chmod +x "$INITRAMFS_ROOT/sbin/zinit"
+    else
+        echo "    ERROR: zinit binary not found! Build may have failed."
+        BINARIES_FOUND=false
+    fi
+else
+    echo "    ✓ zinit found at $INITRAMFS_ROOT/sbin/zinit"
+fi
+
+# Check other binaries
+for binary in "usr/bin/rfs" "usr/bin/mycelium" "usr/bin/corex"; do
+    if [ ! -f "$INITRAMFS_ROOT/$binary" ]; then
+        basename_binary=$(basename "$binary")
+        if [ -f "/build/output/$basename_binary" ]; then
+            echo "    Installing $basename_binary from output directory..."
+            mkdir -p "$INITRAMFS_ROOT/$(dirname $binary)"
+            cp "/build/output/$basename_binary" "$INITRAMFS_ROOT/$binary"
+            chmod +x "$INITRAMFS_ROOT/$binary"
+        else
+            echo "    Warning: $basename_binary not found in output directory"
+        fi
+    else
+        echo "    ✓ $basename_binary found"
+    fi
+done
+
+if [ "$BINARIES_FOUND" = "false" ]; then
+    echo "[DEBUG] ERROR: Critical binaries missing - initramfs will not boot properly"
+    echo "[DEBUG] Make sure to run compile-components.sh before setup-initramfs.sh"
+fi
+
 # Copy other system configurations
 echo "  Setting up system configuration..."