Add root command to open depository with $EDITOR

- Implement openDepository function in cmd/root.go to open the depository directory in $EDITOR
- Falls back to vi if $EDITOR is not set
- Update README.md with new usage section documenting bare 'jade' command
- Include config.go changes that move config location to depository/.jade/

jade-depo/internal/engine/config.go

@@ -11,8 +11,6 @@ import (
 type Config struct {
 	// DepoPath is the path to the jade depository. Default ~/jade-depository
 	DepoPath string `mapstructure:"depo_path"`
-	// ConfigPath is the path to the config directory. Default ~/.config/jade/config.yml
-	ConfigPath string `mapstructure:"config_path"`
 	// TagPrefix is the prefix used for tags in notes. Default "+"
 	TagPrefix string `mapstructure:"tag_prefix"`
 }
@@ -26,13 +24,9 @@ func getDefaultDepoPath() string {
 	return filepath.Join(home, "jade-depository")
 }
 
-// getDefaultConfigPath returns the default config directory path
-func getDefaultConfigPath() string {
-	home, err := os.UserHomeDir()
-	if err != nil {
-		return "./.config/jade/config.yml"
-	}
-	return filepath.Join(home, ".config", "jade", "config.yml")
+// getConfigPath returns the config file path within the depository
+func getConfigPath(depoPath string) string {
+	return filepath.Join(depoPath, ".jade", "config.yml")
 }
 
 // initConfig initializes the configuration using Viper
@@ -42,32 +36,39 @@ func initConfig(cfgPath, depoPath string) (*Config, error) {
 	viper.SetEnvPrefix("JADE")
 	viper.AutomaticEnv()
 
-	// Set defaults
-	viper.SetDefault("depo_path", getDefaultDepoPath())
-	viper.SetDefault("config_path", getDefaultConfigPath())
-	viper.SetDefault("tag_prefix", "+")
-
-	// Determine config file location
-	configDir := cfgPath
-	if configDir == "" {
-		configDir = getDefaultConfigPath()
+	// Determine depository path (from flag, env var, or default)
+	actualDepoPath := depoPath
+	if actualDepoPath == "" {
+		actualDepoPath = viper.GetString("depo_path")
+		if actualDepoPath == "" {
+			actualDepoPath = getDefaultDepoPath()
+		}
 	}
 
-	// Ensure config directory exists
-	if err := os.MkdirAll(configDir, 0755); err != nil {
-		return nil, fmt.Errorf("failed to create config directory: %w", err)
+	// Set defaults
+	viper.SetDefault("depo_path", actualDepoPath)
+	viper.SetDefault("tag_prefix", "+")
+
+	// Ensure depository and .jade directory exist
+	jadeDir := filepath.Join(actualDepoPath, ".jade")
+	if err := os.MkdirAll(jadeDir, 0755); err != nil {
+		return nil, fmt.Errorf("failed to create .jade directory: %w", err)
+	}
+
+	// Determine config file location
+	configFilePath := cfgPath
+	if configFilePath == "" {
+		configFilePath = getConfigPath(actualDepoPath)
 	}
 
 	// Set up config file
-	viper.SetConfigName("config")
-	viper.SetConfigType("yaml")
-	viper.AddConfigPath(configDir)
+	viper.SetConfigFile(configFilePath)
 
 	// Try to read existing config file
 	if err := viper.ReadInConfig(); err != nil {
-		if _, ok := err.(viper.ConfigFileNotFoundError); ok {
+		// Check if file doesn't exist (handles both viper.ConfigFileNotFoundError and os.IsNotExist)
+		if _, ok := err.(viper.ConfigFileNotFoundError); ok || os.IsNotExist(err) {
 			// Config file not found, create it with defaults
-			configFilePath := filepath.Join(configDir, "config.yaml")
 			if err := viper.SafeWriteConfigAs(configFilePath); err != nil {
 				return nil, fmt.Errorf("failed to create config file: %w", err)
 			}
@@ -81,9 +82,6 @@ func initConfig(cfgPath, depoPath string) (*Config, error) {
 	if depoPath != "" {
 		viper.Set("depo_path", depoPath)
 	}
-	if cfgPath != "" {
-		viper.Set("config_path", cfgPath)
-	}
 
 	// Unmarshal config into struct
 	cfg := &Config{}