Add Windows MSI release packaging

[MTG-Thomas]

Summary

• add Windows MSI release workflow using PyInstaller and WiX
• upload MSI assets on published v-prefixed releases
• dispatch package metadata to mtg-winget when releases publish
• document per-machine MSI install behavior

Verification

• git diff --cached --check before commit

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• Let Codesmith autofix CI failures and bot reviews

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 4384c9b5-cd8b-49fe-874f-3c5dc9c4cfe0

📥 Commits

Reviewing files that changed from the base of the PR and between a6f8e12 and d297ba4.

📒 Files selected for processing (7)

• .github/workflows/release-msi.yml
• README.md
• packaging/windows/build-msi.ps1
• packaging/windows/time-tracker.spec
• packaging/windows/time-tracker.wxs
• packaging/windows/time-tracker_launcher.py
• scripts/get_msi_product_code.ps1

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/winget-msi-rollout

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