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

[github-actions]

Summary

Adds a typed factory function for Npm@1 to the ado-aw IR (src/compile/ir/tasks.rs).

Motivation

Previously, any code that needed to emit an Npm@1 pipeline step had to hand-craft
TaskStep::new("Npm@1", ...) with raw string inputs. This PR introduces a well-typed
npm_step() helper that makes the required/optional input boundary explicit and self-documenting,
consistent with the existing typed helpers for UseNode@1, DotNetCoreCLI@2, etc.

Changes

• src/compile/ir/tasks.rs: npm_step(command) factory function + 6 unit tests

ADO Task Reference

• Task: Npm@1
• Docs: https://learn.microsoft.com/en-us/azure/devops/pipelines/tasks/reference/npm-v1
• Required inputs: command ("install" | "ci" | "publish" | "custom")
• Optional inputs: workingDir, verbose, customCommand, customRegistry, customFeed, customEndpoint, publishRegistry, publishFeed, publishEndpoint, publishPackageMetadata

Function signature

pub fn npm_step(command: impl Into<String>) -> TaskStep

Required input is positional; optional inputs are applied via .with_input(...) on the returned TaskStep:

// npm install
let step = npm_step("install");

// npm ci in a subdirectory
let step = npm_step("ci").with_input("workingDir", "$(Build.SourcesDirectory)/app");

// publish to an Azure Artifacts feed
let step = npm_step("publish")
    .with_input("publishRegistry", "useFeed")
    .with_input("publishFeed", "my-org/my-feed");

// custom command
let step = npm_step("custom")
    .with_input("customCommand", "run build -- --production");

Validation

• cargo build --all-targets
• cargo test (2038 unit + 127 integration tests pass)
• cargo clippy --all-targets --all-features --workspace -- -D warnings

---

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