Fix Microsoft Store certification handoff reporting

[FaulMit]

Summary

• wait for Partner Center to finish the initial submission commit
• fail Store publishing when package processing is rejected or stalls
• add a CI regression check for workflow step ordering
• document the certification handoff gate

Root cause

The workflow treated CommitStarted as a successful Store submission. Partner Center later paused package processing, leaving submission 7 in draft while GitHub Actions remained green.

Validation

• ./tools/TestStoreReleaseWorkflow.ps1
• ./tools/SyncStoreListing.ps1 -Version 0.2.1 -ValidateOnly
• git diff --check