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

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Summary

Adds a typed builder struct for DownloadPackage@1 to the ado-aw IR, and migrates the existing raw TaskStep::new("DownloadPackage@1", ...) call in agentic_pipeline.rs to use it.

Motivation

The download_package_step helper in agentic_pipeline.rs hand-crafted a TaskStep using raw string keys ("packageType", "feed", "definition", "version", "downloadPath"). A typo in any key would silently produce invalid pipeline YAML. The new typed builder makes required inputs positional, constrains packageType to a typed enum, and ensures optional inputs are only emitted when explicitly set.

Changes

• src/compile/ir/tasks/download_package.rs: new DownloadPackage builder struct + PackageType enum (NuGet, Npm, PyPi, Maven, UPack, Cargo) + #[cfg(test)] mod tests (5 test cases)
• src/compile/ir/tasks/mod.rs: pub mod download_package; declaration (alphabetical order)
• src/compile/agentic_pipeline.rs: imports DownloadPackage; replaces raw TaskStep::new(...) body in download_package_step with DownloadPackage::nuget(...).with_display_name(...).into_step()

ADO Task Reference

• Task: DownloadPackage@1
• Docs: https://learn.microsoft.com/en-us/azure/devops/pipelines/tasks/reference/download-package-v1-task
• Required inputs: packageType, feed, definition (package name), version, downloadPath
• Optional inputs: view (feed view), files (glob filter, default **), extract (bool, default true)

Validation

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

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