feat(ir): add typed helper for DockerInstaller@0

[github-actions]

Summary

Adds a typed factory function for DockerInstaller@0 to the ado-aw IR and eliminates two hand-crafted TaskStep::new(...) call sites in the compiler.

Motivation

DockerInstaller@0 is emitted in two places in src/compile/agentic_pipeline.rs (the Agent job and the Detection job) using raw TaskStep::new("DockerInstaller@0", "Install Docker").with_input("dockerVersion", "26.1.4"). This PR introduces a well-typed helper that makes the required/optional input boundary explicit and removes the duplication.

Changes

• src/compile/ir/tasks.rs: docker_installer_step(docker_version) factory function with full doc comment and three unit tests
• src/compile/agentic_pipeline.rs: both TaskStep::new("DockerInstaller@0", ...) call sites replaced with docker_installer_step("26.1.4"); unused TaskStep import removed

ADO Task Reference

• Task: DockerInstaller@0
• Docs: https://learn.microsoft.com/en-us/azure/devops/pipelines/tasks/reference/docker-installer-v0
• Required inputs: dockerVersion (string, e.g. "26.1.4")
• Optional inputs: releaseType (string, default "stable"; values: stable, edge, test, nightly)

Validation

• cargo build --all-targets
• cargo test — 1856 unit tests + all integration tests pass
• cargo clippy --all-targets --all-features --workspace -- -D warnings

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