feat(ir): add typed builder for UseNode@1

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Summary

Adds a typed builder struct for UseNode@1 to the ado-aw IR, and converts two stringly-typed TaskStep::new("UseNode@1", ...) call sites to use it.

Motivation

UseNode@1 appears in two production compiler paths with raw string input keys:

1. src/compile/extensions/ado_script.rs — install_and_download_steps_typed builds a UseNode@1 step to install Node.js 22.x before downloading the ado-script bundle.
2. src/runtimes/node/extension.rs — node_install_task_step builds the install step for the Node.js runtime.

This PR introduces a typed builder struct (new(version) + typed optional setters + into_step()) so the version is positional, optional inputs are type-checked, and call sites no longer use stringly-typed input keys.

Changes

• src/compile/ir/tasks/use_node.rs: new UseNode builder struct with typed setters for all inputs and a #[cfg(test)] mod tests with four unit tests
• src/compile/ir/tasks/mod.rs: pub mod use_node; declaration (alphabetical)
• src/compile/extensions/ado_script.rs: converted TaskStep::new("UseNode@1", ...) → UseNode::new("22.x").into_step(); removed now-unused TaskStep import
• src/runtimes/node/extension.rs: converted node_install_task_step to use UseNode::new(version).into_step()

ADO Task Reference

• Task: UseNode@1
• Docs: (https://learn.microsoft.com/en-us/azure/devops/pipelines/tasks/reference/use-node-v1-task)
• Required inputs: version (Node.js version spec, e.g. "22.x", "20.x")
• Optional inputs: checkLatest (bool), force32bit (bool), retryCountOnDownloadFails (string), delayBetweenRetries (string)

Validation

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

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