Cleanup PowerShell

[kodevza]

Summary

Refactors the PowerShell tooling into a first-class OwnerLens PowerShell module and updates packaging/publish support around it.

Changes

• Adds powershell/OwnerLens module structure with public commands for install, start, stop, open, status, and Azure/Entra collection.
• Moves existing snapshot preparation and activity log helper scripts into module-private functions.
• Adds PowerShell module build, Windows runtime build, and package scripts.
• Updates package publishing workflow for the new packaging flow.
• Updates CLI/runtime REST support needed by the PowerShell module.
• Refreshes README/tools docs and adds development/module documentation.
• Replaces old tool-level PowerShell tests with module-focused tests.

Testing

• Added tests/powershell/OwnerLens.Tests.ps1
• Added/updated runtime REST coverage in LocalReportRuntime.test.ts

Notes

This keeps the ownership/snapshot workflow local-first while making the PowerShell surface easier to install, package, and publish.