Remove Makefiles and update documentation for pure CMake build system

Co-authored-by: johndoe6345789 <224850594+johndoe6345789@users.noreply.github.com>

tests/Makefile

@@ -1,64 +0,0 @@
-# MetalOS Test Suite Makefile
-
-CC = gcc
-CFLAGS = -Wall -Wextra -std=c11 -I../tests/include -I../kernel/include -I../bootloader/include
-LDFLAGS = 
-
-# Test source files
-TEST_SOURCES = $(wildcard unit/*.c)
-TEST_BINARIES = $(TEST_SOURCES:.c=)
-
-# Default target
-.PHONY: all
-all: $(TEST_BINARIES)
-
-# Build each test binary
-unit/%: unit/%.c include/test_framework.h
-	@echo "Building test: $@"
-	$(CC) $(CFLAGS) $< -o $@ $(LDFLAGS)
-
-# Run all tests
-.PHONY: test
-test: all
-	@echo ""
-	@echo "╔════════════════════════════════════════════╗"
-	@echo "║      Running MetalOS Test Suite           ║"
-	@echo "╚════════════════════════════════════════════╝"
-	@echo ""
-	@for test in $(TEST_BINARIES); do \
-		./$$test || exit 1; \
-	done
-	@echo ""
-	@echo "╔════════════════════════════════════════════╗"
-	@echo "║      All Test Suites Passed ✓              ║"
-	@echo "╚════════════════════════════════════════════╝"
-	@echo ""
-
-# Run tests with verbose output
-.PHONY: test-verbose
-test-verbose: all
-	@for test in $(TEST_BINARIES); do \
-		echo "Running $$test..."; \
-		./$$test -v; \
-		echo ""; \
-	done
-
-# Clean test binaries
-.PHONY: clean
-clean:
-	@echo "Cleaning test binaries..."
-	@rm -f $(TEST_BINARIES)
-	@rm -f unit/*.o
-	@echo "Clean complete"
-
-# Help target
-.PHONY: help
-help:
-	@echo "MetalOS Test Suite Makefile"
-	@echo ""
-	@echo "Targets:"
-	@echo "  all           - Build all test binaries"
-	@echo "  test          - Build and run all tests"
-	@echo "  test-verbose  - Run tests with verbose output"
-	@echo "  clean         - Remove test binaries"
-	@echo "  help          - Show this help message"