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

Summary by CodeRabbit

• Chores
  • Enhanced build script parameter validation to ensure more reliable builds.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 7c1c81d3-8d5c-4e36-943d-831b2d5cfa47

📥 Commits

Reviewing files that changed from the base of the PR and between 334e36d and 3c2997d.

📒 Files selected for processing (1)

• build.ps1

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📝 Walkthrough

Walkthrough

The build.ps1 script's Task parameter now includes a [ValidateNotNullOrEmpty()] validation attribute to enforce that callers provide a non-empty task name before execution.

Changes

Build Script Parameter Validation

Layer / File(s)	Summary
Task parameter validation build.ps1	The Task parameter declaration adds [ValidateNotNullOrEmpty()] to require a non-null, non-empty value at script invocation.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A single line, so short and sweet,
Validation makes the build complete!
No empty tasks shall pass on through,
The rabbit approves—this change is true! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately and specifically describes the main change: adding ValidateNotNullOrEmpty validation to the Task parameter in build.ps1.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ 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

This PR improves build.ps1 argument validation by adding [ValidateNotNullOrEmpty()] to the -Task parameter, so invalid invocations fail immediately during parameter binding rather than producing confusing downstream psake errors.

Changes:

• Add [ValidateNotNullOrEmpty()] to the build.ps1 -Task parameter to reject '' and $null inputs earlier.

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