Add Windows binary build to release workflow

[adamtheturtle]

This PR adds Windows/exe installation support, following the pattern used in doccmd.

Changes

Release workflow (.github/workflows/release.yml)

• Added outputs to the main build job to expose new_tag for the Windows job
• Added new build-windows job that:
  • Runs on windows-latest after the main build job completes
  • Waits for PyPI propagation with retry logic (handles version normalization like 2026.01.22 → 2026.1.22)
  • Builds Windows executables for both vws and vuforia-cloud-reco using PyInstaller
  • Uploads the Windows binaries to the GitHub release

Documentation

• README.rst: Added "Pre-built Windows binaries" section with link to latest release
• docs/source/install.rst: Added "Pre-built Windows binaries" section with link to latest release

Binary naming

• vws-windows.exe - Main VWS CLI
• vuforia-cloud-reco-windows.exe - Cloud Reco CLI

These follow the existing naming convention for Linux binaries (vws-linux, vuforia-cloud-reco-linux).

---

Note

Adds Windows binary build/publish to the release pipeline and updates docs to advertise Windows executables.

• CI/release: Exposes new_tag from build job; adds build-windows job (Windows runner) that waits for PyPI propagation (normalized version), builds vws and vuforia-cloud-reco Windows executables via PyInstaller, and uploads them to the GitHub release
• Docs: Adds “Pre-built Windows binaries” sections to README.rst and docs/source/install.rst with link to latest release
• Misc: Updates spelling_private_dict.txt to include executables

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