[Package Request]: eFisc2026 + eFisc2025

### How can we help?

I would like someone else to build the manifest.

### Please read and ensure the following

- [x] The installer meets the above requirements

### Please provide the following information

Download Page Url: https://steuerverwaltung.tg.ch/hilfsmittel/efisc-steuererklaerungssoftware/download-efisc2026.html/18120
Publisher: Abraxas
Package Name: eFisc2026
Description: Free tax return software from the cantonal tax administration of Thurgau, Switzerland
Package Version: 1.0.0-76
Installer Url: https://efisc.kttg.ch/update/eFisc/2026/efisc2026-1.0.0-76-64bit.msi

There would also be eFisc2025:
Download Page Url: https://steuerverwaltung.tg.ch/hilfsmittel/efisc-steuererklaerungssoftware/download-efisc2025.html/17525
Publisher: Abraxas
Package Name: eFisc2025
Description: Free tax return software from the cantonal tax administration of Thurgau, Switzerland
Package Version: 1.0.6-78
Installer Url: https://efisc.kttg.ch/update/eFisc/2025/efisc2025-1.0.6-78-64bit.msi

Start by checking the provided download pages and MSI URLs for eFisc2026 and eFisc2025, then review nearby package manifests in the winget-pkgs repository for the expected structure and metadata. Done means both requested package versions have manifests with the supplied publisher, descriptions, versions, and installer URLs that pass repository validation.

Written by the indexing model from the issue text.