feat(ir): add typed helper for MSBuild@1

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Summary

Adds a typed factory function msbuild_step() for MSBuild@1 to the ado-aw IR tasks module.

Motivation

Previously, any code that needed to emit an MSBuild@1 step had to hand-craft TaskStep::new("MSBuild@1", ...) with raw string inputs. MSBuild@1 is the standard build tool for .NET Framework solutions and projects — filling a gap left by dot_net_core_cli_step (which targets cross-platform .NET Core / .NET 5+). This PR introduces a well-typed helper with a clear required/optional input boundary.

Changes

• src/compile/ir/tasks.rs: msbuild_step(solution) factory function with full doc-comment table of optional inputs, placed after docker_logout_step().
• src/compile/ir/tasks.rs (tests): Six new unit tests covering required-only construction, platform/configuration, msbuildArguments, optional boolean flags (clean, maximumCpuCount, restoreNugetPackages), explicit MSBuild location (msbuildLocationMethod = location), and .csproj project targets.

API

// Minimal — build all solutions in the repo
let step = msbuild_step("**/*.sln");

// Typical release build
let step = msbuild_step("src/MyApp/MyApp.sln")
    .with_input("platform", "x64")
    .with_input("configuration", "Release");

// With extra MSBuild arguments
let step = msbuild_step("**/*.sln")
    .with_input("msbuildArguments", "/p:DeployOnBuild=true /p:WebPublishMethod=Package")
    .with_input("maximumCpuCount", "true");

// Explicit MSBuild binary path
let step = msbuild_step("**/*.sln")
    .with_input("msbuildLocationMethod", "location")
    .with_input("msbuildLocation", "C:\\Program Files\\MSBuild\\17.0\\Bin\\msbuild.exe");

ADO Task Reference

• Task: MSBuild@1
• Docs: (https://learn.microsoft.com/en-us/azure/devops/pipelines/tasks/reference/msbuild-v1)
• Required inputs: solution (path/glob to .sln or .*proj)
• Optional inputs: platform, configuration, msbuildArguments, clean, maximumCpuCount, restoreNugetPackages, msbuildLocationMethod, msbuildVersion, msbuildArchitecture, msbuildLocation, logProjectEvents, createLogFile, logFileVerbosity

Validation

• cargo build --all-targets
• cargo test (6 new tests, all passing)
• cargo clippy --all-targets --all-features --workspace -- -D warnings

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