Implement CLI skeleton with cobra and fx dependency injection

- Set up cobra CLI with all commands (backup, restore, prune, verify, fetch)
- Integrate uber/fx for dependency injection and lifecycle management
- Add globals package with build-time variables (Version, Commit)
- Implement config loading from YAML with validation
- Create core data models (FileInfo, ChunkInfo, BlobInfo, Snapshot)
- Add Makefile with build, test, lint, and clean targets
- Include minimal test suite for compilation verification
- Update documentation with --quick flag for verify command
- Fix markdown numbering in implementation TODO

internal/config/config_test.go

@@ -0,0 +1,47 @@
+package config
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+// TestConfigLoad ensures the config package can be imported and basic functionality works
+func TestConfigLoad(t *testing.T) {
+	// Create a temporary config file
+	tmpDir := t.TempDir()
+	configPath := filepath.Join(tmpDir, "test-config.yaml")
+	
+	configContent := `age_recipient: age1xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+source_dirs:
+  - /tmp/test
+s3:
+  endpoint: https://s3.example.com
+  bucket: test-bucket
+  access_key_id: test-key
+  secret_access_key: test-secret
+`
+	
+	if err := os.WriteFile(configPath, []byte(configContent), 0644); err != nil {
+		t.Fatalf("Failed to write test config: %v", err)
+	}
+	
+	// Test loading the config
+	cfg, err := Load(configPath)
+	if err != nil {
+		t.Fatalf("Failed to load config: %v", err)
+	}
+	
+	// Basic validation
+	if cfg.AgeRecipient != "age1xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" {
+		t.Errorf("Expected age recipient to be set, got '%s'", cfg.AgeRecipient)
+	}
+	
+	if len(cfg.SourceDirs) != 1 || cfg.SourceDirs[0] != "/tmp/test" {
+		t.Errorf("Expected source dirs to be ['/tmp/test'], got %v", cfg.SourceDirs)
+	}
+	
+	if cfg.S3.Bucket != "test-bucket" {
+		t.Errorf("Expected S3 bucket to be 'test-bucket', got '%s'", cfg.S3.Bucket)
+	}
+}