feat(ir): add typed helper for NuGetCommand@2

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Summary

Adds a typed factory function nuget_command_step() for NuGetCommand@2 to the ado-aw typed task IR.

Motivation

NuGetCommand@2 is already used in engine.rs as a hand-crafted raw YAML string to install the Copilot CLI from an Azure Artifacts NuGet feed. This PR introduces a well-typed helper that eliminates the need to hand-craft TaskStep::new(...) with raw string inputs, providing a clear API for callers and making the required/optional input boundary explicit.

// Example: install a package using custom command
nuget_command_step("custom")
    .with_input("arguments", "install My.Package -Version 1.0.0 -Source https://pkgs.dev.azure.com/...")

// Example: restore with an Azure Artifacts feed
nuget_command_step("restore")
    .with_input("solution", "src/MyApp.sln")
    .with_input("feedsToUse", "select")
    .with_input("vstsFeed", "myorg/myproject/myfeed")

// Example: push to internal feed
nuget_command_step("push")
    .with_input("nuGetFeedType", "internal")
    .with_input("publishVstsFeed", "myorg/myfeed")

Changes

• src/compile/ir/tasks.rs: nuget_command_step() factory function with full doc comment covering all four command modes (restore, push, pack, custom) and their optional inputs
• Five new unit tests covering: restore, push with feed, custom with arguments, all supported commands, and optional restore inputs

ADO Task Reference

• Task: NuGetCommand@2
• Docs: (https://learn.microsoft.com/en-us/azure/devops/pipelines/tasks/reference/nuget-command-v2)
• Required inputs: command (restore | push | pack | custom)
• Key optional inputs: arguments (custom), solution (restore), vstsFeed (restore/push), packagesToPush (push), packagesToPack (pack)

Validation

• cargo build --all-targets
• cargo test
• cargo clippy --all-targets --all-features --workspace -- -D warnings

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