style: add ValidateNotNullOrEmpty to build.ps1 -Task parameter

[tablackburn]

Summary

Adds [ValidateNotNullOrEmpty()] to the $Task parameter in build.ps1 to match the canonical pattern from PowerShellModuleTemplate#23.

Without the validator, ./build.ps1 -Task '' and ./build.ps1 -Task $null` slip past parameter binding and produce confusing downstream errors from psake. The validator surfaces the misuse immediately.

Test plan

• ./build.ps1 still runs successfully (default 'default' task)
• ./build.ps1 -Task '' fails fast with a parameter-validation error

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 2f8a0e2b-02e7-4e2c-8f79-572eb345e8bf

📥 Commits

Reviewing files that changed from the base of the PR and between c2bebb1 and ad050c1.

📒 Files selected for processing (1)

• build.ps1

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch style/validate-task-not-null-or-empty

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[Copilot]

Pull request overview

This PR aims to improve the developer experience of the repository’s build entrypoint (build.ps1) by tightening parameter validation for the psake task selection, so misuse fails early with a clear parameter-binding error rather than later with confusing psake errors.

Changes:

• Adds [ValidateNotNullOrEmpty()] to the -Task parameter in build.ps1.

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