Launch RecallManager v1 beta

[antonflor]

What changed

Turns the original one-question DISM toggle into a state-aware Recall management module (src/RecallManager) with public commands (Get-RecallStatus, Get-RecallAudit, Get-RecallPlan, Set-RecallProfile, Restore-RecallConfiguration, Export-RecallReport), four desired-state profiles, Pester tests, CI workflows, and docs.

This branch also includes two fixes found during live testing on a Windows 11 device (build 26200):

• Get-RecallWindowsInfo: renamed local $isWindows -> $isWindowsOs. Assigning to the read-only automatic $IsWindows variable throws in PowerShell 6+ (PSScriptAnalyzer error).
• Tests: import the module at file scope so InModuleScope resolves during Pester's discovery phase. Previously the "Effective state reasoning" block failed to load, so 3 of 7 tests never ran.

Safety impact

• Audit-only change (read-only commands verified)
• Changes Windows policy (via SnapshotsOff / PrivacyHardened profiles)
• Changes an optional feature (PrivacyHardened disables/removes the component)
• May delete existing Recall snapshots (per Microsoft policy behavior)
• May require restart

Validation

• PSScriptAnalyzer (0 errors; 16 intentional warnings - CLI Write-Host, -Profile param)
• Pester on Windows PowerShell 5.1
• Pester on PowerShell 7 (7/7 passing)
• Tested on a device where Recall is unavailable (read-only Status/Audit/Plan + JSON verified live)
• Tested on an eligible Copilot+ PC
• Restore tested
• Screenshots redacted

Documentation

No doc changes in the fix commit. Change-path testing (Apply/Restore on a Copilot+ device, screenshots) is still outstanding per docs/testing.md before tagging the beta.

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