Support tree structure in status command

[geofflamrock]

This PR is part of supporting a tree structure with stack, where a branch can have multiple child branches:

• Add support for tree structure in config file #252
  • Adds command to migrate from v1 to v2 format #263
    • Support tree structure in status command #262
      • Support tree structure when creating new branch #265
        • Support tree structure when adding branch to stack #270
      • Support tree structure when updating stack #264
      • Support tree structure when creating pull requests #266
      • Support tree structure when removing branch from stack #271
      • Support tree structure when cleaning stack #272

Fixes #254

[Copilot]

Pull Request Overview

Adds hierarchical tree support to the status command by extending JSON output, console rendering, and tests to carry and display nested branch children.

• Introduces generic Tree<T>/TreeItem<T> and adds a Tree(Tree<string>) overload to ILogger/ConsoleLogger
• Extends JSON output records and mapping functions to include Children collections
• Refactors StackHelpers and commands to build and render nested branch trees; updates tests to use a TestLogger

Reviewed Changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/Stack/Stack.csproj	Added MoreLinq reference for tree traversal utilities
src/Stack/Infrastructure/ConsoleLogger.cs	Implemented Tree(Tree<string>) and recursion helper
src/Stack/Commands/Stack/StackStatusCommand.cs	Updated JSON records, mapping logic, and schema‐version handling
src/Stack/Commands/PullRequests/CreatePullRequestsCommand.cs	Updated output methods to accept schema version and tree items
src/Stack/Commands/Helpers/StackHelpers.cs	Added methods to build, traverse, and output nested branch lists
src/Stack.Tests/Helpers/TestLogger.cs	Stubbed Tree logger (needs deeper recursion)
src/Stack.Tests/...	Switched tests to use TestLogger with ITestOutputHelper

Comments suppressed due to low confidence (2)

src/Stack.Tests/Helpers/TestLogger.cs:54

• [nitpick] The TestLogger.Tree method only writes top‐level children and skips nested nodes. Implement recursive traversal so tests can verify deeper levels of the rendered tree.

// TODO: Handle child nodes if needed

src/Stack.Tests/Commands/Stack/StackSwitchCommandHandlerTests.cs:13

• Class declarations cannot take constructor parameters directly. Move the ITestOutputHelper parameter into a proper constructor inside the class body to compile correctly.

public class StackSwitchCommandHandlerTests(ITestOutputHelper testOutputHelper)