Only register PostToolUse hook during installation

Since cnotes only handles PostToolUse events (and ignores all others),
update the installation to only register for that specific event rather
than all available hook events. This reduces unnecessary hook calls.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

internal/config/settings.go

@@ -106,40 +106,30 @@ func InstallHooksToPath(binaryPath, settingsPath string) error {
 		Hooks:   []HookAction{hookAction},
 	}
 
-	// Map our event names to Claude's event names
-	eventMap := map[string]string{
-		"pre_tool_use":       "PreToolUse",
-		"post_tool_use":      "PostToolUse",
-		"user_prompt_submit": "UserPromptSubmit",
-		"stop":               "Stop",
-		"subagent_stop":      "SubagentStop",
-		"notification":       "Notification",
-		"pre_compact":        "PreCompact",
-	}
+	// Only register for PostToolUse events since that's all we handle
+	claudeEvent := "PostToolUse"
 
-	for _, claudeEvent := range eventMap {
-		// Check if our hook is already installed
-		found := false
-		for i, def := range settings.Hooks[claudeEvent] {
-			for j, action := range def.Hooks {
-				if action.Command == binaryPath {
-					// Update existing hook
-					settings.Hooks[claudeEvent][i].Hooks[j] = hookAction
-					found = true
-					break
-				}
-			}
-			if found {
+	// Check if our hook is already installed
+	found := false
+	for i, def := range settings.Hooks[claudeEvent] {
+		for j, action := range def.Hooks {
+			if action.Command == binaryPath {
+				// Update existing hook
+				settings.Hooks[claudeEvent][i].Hooks[j] = hookAction
+				found = true
 				break
 			}
 		}
-
-		if !found {
-			// Add new hook
-			settings.Hooks[claudeEvent] = append(settings.Hooks[claudeEvent], hookDef)
+		if found {
+			break
 		}
 	}
 
+	if !found {
+		// Add new hook
+		settings.Hooks[claudeEvent] = append(settings.Hooks[claudeEvent], hookDef)
+	}
+
 	return SaveSettings(settingsPath, settings)
 }