Add restart-safe batched guest invitations

[PrzemyslawKlys]

Summary

• add Import-GraphGuestBatch with validated Microsoft Graph batches of up to 20 invitation requests
• inspect every subresponse and retry only 429 and 503 failures while honoring Retry-After
• support dictionary-shaped Microsoft Graph SDK subresponses for successful and throttled operations
• distinguish definite pre-dispatch authorization and missing-SDK failures from uncertain post-send transport failures
• preserve real dispatch and retry accounting when a later credential refresh fails
• expose pending and completed batch callbacks so consumers can create durable restart checkpoints
• isolate callback output, suppress checkpoint callbacks for every WhatIf path, and avoid nested confirmation prompts
• parse CSV-style boolean overrides safely and share invitation payload construction with the existing single-invitation command

Compatibility

Import-GraphGuest keeps its existing public behavior. The shared transport wrapper preserves warning-based error handling by default and adds an explicit fail-on-error option for reliable bulk processing. Tests cover Windows PowerShell 5.1 and PowerShell 7.

Release note

This advances the module source to 0.2.5. Private downstream consumers should repin after the package is published.

[chatgpt-codex-connector]

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-12T23:27:29.823534Z	f67607d	New commits

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