Section `Server requests and responses tutorial` problem `private val tasks cannot be accessed from Routing.kt`

The current documentation declares `tasks` as `private` in `TaskRepository.kt`, but later accesses it directly from `Routing.kt` using `tasks.tasksAsTable()`.

This causes a Kotlin compilation error:

`Cannot access 'val tasks': it is private in file`

Suggested fix:

* remove `private`

Start with the `tasks` declaration in `TaskRepository.kt` and its direct use in `Routing.kt` in the `Server requests and responses tutorial`. Check the visibility mismatch, apply the documented correction, and verify that the tutorial no longer produces the Kotlin private-access compilation error.

Written by the indexing model from the issue text.