Implement Jade CLI v1.0 MVP

Complete implementation of note management CLI with all core features:

Commands:
- add: Create new notes in $EDITOR with auto-generated filenames
- list: Display all notes with titles, paths, and tags
- search: Full-text search via ripgrep, tag-based filtering
- tags: List all tags with occurrence counts
- edit: Fuzzy search and edit notes by title
- rm: Move notes to trash with confirmation prompt

Features:
- Automatic depository structure initialization (.jade/trash/)
- Configurable tag prefix (default '+')
- Parse title from first # heading (filename fallback)
- Extract tags anywhere in content
- Parse both [[wiki-links]] and [markdown](links)
- Trash system with timestamps to prevent conflicts

Technical:
- Global config at ~/.config/jade/config.yml
- Per-depository settings support
- Ripgrep integration for fast search
- $EDITOR integration for note editing
- Comprehensive README with usage examples

jade-depo/internal/engine/jade.go

@@ -1,6 +1,12 @@
 package engine
 
-import "fmt"
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+var instance *JadeDepo
 
 type JadeDepo struct {
 	Config *Config
@@ -12,11 +18,52 @@ func Init(cfgPath, depoPath string) (*JadeDepo, error) {
 		return nil, fmt.Errorf("failed to initialize config: %w", err)
 	}
 
-	return &JadeDepo{
+	jd := &JadeDepo{
 		Config: cfg,
-	}, nil
+	}
+
+	// Initialize depository structure
+	if err := jd.initDepoStructure(); err != nil {
+		return nil, fmt.Errorf("failed to initialize depository structure: %w", err)
+	}
+
+	// Store global instance
+	instance = jd
+
+	return jd, nil
 }
 
-// AddNote creates a new note in the depository
-func AddNote() Note {
+// GetInstance returns the global JadeDepo instance
+func GetInstance() (*JadeDepo, error) {
+	if instance == nil {
+		return nil, fmt.Errorf("jade depository not initialized")
+	}
+	return instance, nil
+}
+
+// initDepoStructure creates the necessary directories in the depository
+func (jd *JadeDepo) initDepoStructure() error {
+	// Create depository root if it doesn't exist
+	if err := os.MkdirAll(jd.Config.DepoPath, 0755); err != nil {
+		return fmt.Errorf("failed to create depository: %w", err)
+	}
+
+	// Create .jade directory for metadata
+	jadeDir := filepath.Join(jd.Config.DepoPath, ".jade")
+	if err := os.MkdirAll(jadeDir, 0755); err != nil {
+		return fmt.Errorf("failed to create .jade directory: %w", err)
+	}
+
+	// Create trash directory
+	trashDir := filepath.Join(jadeDir, "trash")
+	if err := os.MkdirAll(trashDir, 0755); err != nil {
+		return fmt.Errorf("failed to create trash directory: %w", err)
+	}
+
+	return nil
+}
+
+// GetTrashPath returns the path to the trash directory
+func (jd *JadeDepo) GetTrashPath() string {
+	return filepath.Join(jd.Config.DepoPath, ".jade", "trash")
 }