feat(ir): add tasks module with typed helper for PublishTestResults@2

[github-actions]

Summary

Introduces src/compile/ir/tasks.rs — a new module that will serve as the canonical home for typed factory functions for ADO built-in pipeline tasks. The first entry is publish_test_results_step, a well-typed helper for PublishTestResults@2.

Motivation

Previously, any compiler code that needed to emit PublishTestResults@2 had to hand-craft TaskStep::new("PublishTestResults@2", ...).with_input(...).with_input(...) inline, duplicating the raw string input keys. This PR introduces a single source of truth for that task's required/optional input contract.

Changes

• src/compile/ir/tasks.rs (new): publish_test_results_step(format, files) factory function with full doc comment listing all supported optional inputs.
• src/compile/ir/mod.rs: adds pub mod tasks; to expose the new module.

publish_test_results_step signature

pub fn publish_test_results_step(
    test_results_format: impl Into<String>,  // "JUnit" | "NUnit" | "VSTest" | "XUnit" | "CTest"
    test_results_files: impl Into<String>,   // glob, e.g. "**/TEST-*.xml"
) -> TaskStep

Optional inputs applied via .with_input(...):

Key	Default	Description
testRunTitle	—	Label in the build summary
searchFolder	$(System.DefaultWorkingDirectory)	Root for glob expansion
mergeTestResults	"false"	Combine into one run
failTaskOnFailedTests	"false"	Fail step if tests failed
publishRunAttachments	"true"	Upload result files

ADO Task Reference

• Task: PublishTestResults@2
• Docs: (https://learn.microsoft.com/en-us/azure/devops/pipelines/tasks/reference/publish-test-results-v2)
• Required inputs: testResultsFormat, testResultsFiles
• Optional inputs: testRunTitle, searchFolder, mergeTestResults, failTaskOnFailedTests, failTaskOnFailureToPublishResults, failTaskOnMissingResultsFile, publishRunAttachments

Tests

Three unit tests in src/compile/ir/tasks.rs:

• publish_test_results_step_sets_task_and_required_inputs — verifies task id, display name, and both required inputs
• publish_test_results_step_accepts_all_supported_formats — smoke-tests all five format identifiers
• publish_test_results_step_optional_inputs_via_with_input — verifies the .with_input(...) extension pattern

Validation

• cargo build --all-targets — clean
• cargo test — 1853 + 3 new tests pass, 0 failures
• cargo clippy --all-targets --all-features --workspace -- -D warnings — clean

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