chore: Bump 7-Zip 24.07→26.01, Git 2.47→2.54 across docs + setup

Setup-WinBuild2025.ps1: default SevenZipVersion '24.07' → '26.01'
TODO.md: Tier-1 table + bullet list updated to current versions
TEST-PLAN: expected version strings and checklist updated

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

TODO.md

@@ -511,15 +511,15 @@ Aggiungere tools generici-CI riduce il bisogno di installazione ad-hoc nei workf
 build più ampi senza toccare il template.
 
 ### Tier-1 (implementato)
-- [x] **Git for Windows** (v2.47.0.windows.1) — Step 11, self-clone in VM
-- [x] **7-Zip** (24.07) — Step 11, universal compression + fallback §3.2
+- [x] **Git for Windows** (v2.54.0.windows.1) — Step 11, self-clone in VM
+- [x] **7-Zip** (26.01) — Step 11, universal compression + fallback §3.2
 
 ### Tier-2 (backlog) — tool da aggiungere come ulteriori step `Setup-WinBuild2025` (ognuno con `Assert-Step`):
 
 | Tool                | Versione                | Razionale                                                      |
 | ------------------- | ----------------------- | -------------------------------------------------------------- |
-| **Git for Windows** | 2.47.0.windows.1        | [x] Self-clone in VM (alt a host-zip-transfer), submodule fetch    |
-| **7-Zip**           | 24.07                   | [x] Universale unpack/zip; molti installer e workflow ne dipendono |
+| **Git for Windows** | 2.54.0.windows.1        | [x] Self-clone in VM (alt a host-zip-transfer), submodule fetch    |
+| **7-Zip**           | 26.01                   | [x] Universale unpack/zip; molti installer e workflow ne dipendono |
 | **PowerShell 7.x**  | latest LTS              | [ ] Più veloce di 5.1, parallel pipelines, operatori moderni       |
 | **NSIS**            | latest                  | Test build installer (es. `nsis-plugin-nsinnounp`)             |
 | **CMake**           | latest                  | Build system cross-platform per progetti C/C++ nativi          |