Enhance PowerShell switch parameter guidance and examples

[time-by-waves]

Pull Request Checklist

• I have read and followed the CONTRIBUTING.md guidelines.
• I have read and followed the Guidance for submissions involving paid services.
• My contribution adds a new instruction, prompt, agent, skill, or workflow file in the correct directory.
• The file follows the required naming convention.
• The content is clearly structured and follows the example format.
• I have tested my instructions, prompt, agent, skill, or workflow with GitHub Copilot.
• I have run npm start and verified that README.md is up to date.

---

Description

Error Handling

• Update to the powershell.instructions.md file. Now includes less error handling in the examples. This means when using the instructions file the output script contains less of the structured error handling, however the output scripts are easier for beginners and powershell novices to read and understand.

Switch parameter

• Updates to using the switch parameters should now prevent default values data type being a bool
• Using no default value is the way in PowerShell. Defaults to a false value and shouldn't be set to a true value. Although a note has been added to show the correct syntax that requires type casting

Examples updates

• Now includes a better demonstration of using the WhatIf parameter via $PSCmdlet.ShouldProcesss
• Full Example: End-to-End Cmdlet Pattern updated with the $Force & $PSCmdlet.ShouldContinue pattern

---

Type of Contribution

• New instruction file.
• New prompt file.
• New agent file.
• New plugin.
• New skill file.
• New agentic workflow.
• Update to existing instruction, prompt, agent, plugin, skill, or workflow.
• Other (please specify):

---

Additional Notes

I've tested the new instructions for a few months on and off. Many different models have been used, and I'm happier with the generated results of these instructions.

---

By submitting this pull request, I confirm that my contribution abides by the Code of Conduct and will be licensed under the MIT License.