feat: integrate PSFramework for structured logging and configuration

[Copilot]

Wires in PSFramework as a first-class dependency, replacing ad-hoc Write-Output with structured, leveled messaging and adding a persistent config entry.

Module (PasskeyDiagnostics.psm1 / .psd1)

• RequiredModules now enforces PSFramework >= 1.0.0
• Write-Output replaced with Write-PSFMessage -Level Verbose — messages route to both the Verbose stream and the PSFramework in-memory/file log automatically
• Stop-PSFFunction used for error handling (non-terminating, PSF-aware)
• Set-PSFConfig -Initialize registers a PasskeyDiagnostics.LogLevel entry users can override via the PSFramework config system

# Messages are now inspectable after the fact
Get-PasskeyDiagnosticInfo
Get-PSFMessage   # shows timestamped, structured entries

# Logging behaviour is configurable
Set-PSFConfig -FullName 'PasskeyDiagnostics.LogLevel' -Value 'Host'

CI (.github/workflows/test.yml)

• Added idempotent Install PSFramework step mirroring the existing Pester install pattern

Tests (PasskeyDiagnostics.Tests.ps1)

• Added #Requires -Modules PSFramework
• New contexts cover Get-PasskeyDiagnosticInfo return-value shape and the registered PSFramework config entry/default value

[BurtHarris]

@copilot resolve the merge conflicts in this pull request

[Copilot]

@copilot resolve the merge conflicts in this pull request

Merge conflicts resolved in commit 0dfda53.

What conflicted: PR #3 (merged to main after this branch was created) renamed PasskeyDiagnostics/ → MyModule/ as a generic template structure and added Initialize-Module.ps1. This caused delete/modify conflicts on the three PasskeyDiagnostics/ files this branch had modified.

How it was resolved:

• PasskeyDiagnostics/PasskeyDiagnostics.psd1 — git's rename detection correctly mapped this to MyModule/MyModule.psd1, preserving the RequiredModules = @{ PSFramework ... } entry from this branch.
• PasskeyDiagnostics/PasskeyDiagnostics.psm1 — removed (moved); PSFramework integration (#Requires -Modules PSFramework, Set-PSFConfig, Write-PSFMessage) applied to MyModule/MyModule.psm1 instead.
• tests/PasskeyDiagnostics.Tests.ps1 — removed (moved); PSFramework #Requires and config tests added to tests/MyModule.Tests.ps1.
• README.md — took main's template README verbatim; kept the PSFramework prerequisite line that both sides had added.