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: ed1c3fe6-1d17-4b2d-9d67-e032bdb7e3a0

📥 Commits

Reviewing files that changed from the base of the PR and between 566b548 and d133621.

📒 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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[Copilot]

Pull request overview

Adds early parameter validation to build.ps1 so invalid -Task values fail fast during parameter binding instead of producing downstream psake errors.

Changes:

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

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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