Path B: delete superseded modules, Functions, scaffolding

Removed per PROJECT_OVERVIEW.md Path B:
- Modules: AzureManagement, IntelliTect.PSDbxCli, IntelliTect.PSDropbin,
  IntelliTect.PSRestore, IntelliTect.ResharperNugetSearch,
  IntelliTect.MicrosoftWord, IntelliTect.Google, IntelliTect.ChatGpt,
  DotNetCore (and their tests)
- Functions/, Functions.Tests/ (dot-sourced legacy scripts)
- Main.ps1, Main.Tests.ps1 (legacy entry point)
- Archived Modules/
- submodules/, .gitmodules (unused RamblingCookieMonster submodule)
- Lib/, Content/ (unused binaries and test fixture)
- Setup.ps1 (ISE bootstrapper; ISE deprecated)

Legacy state preserved at tag v1.0-legacy and branch legacy/v1.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Copilot