feat: enhance documentation and scripts for in-VM Git cloning and template setup

- Updated README.md to reflect the new in-VM git clone feature with `-UseGitClone`.
- Modified Setup-Host.ps1 to correct VMX path references.
- Revised various documentation files (ARCHITECTURE.md, CI-FLOW.md, HOST-SETUP.md, WINDOWS-TEMPLATE-SETUP.md) to include updated paths and features.
- Added Setup-GiteaSSH.md for SSH configuration instructions.
- Archived outdated documentation and updated README.md for clarity on current resources.

docs/archived/2026-05-10/README.md

@@ -4,9 +4,15 @@ Date: 2026-05-10
 
 ## Archived Files
 
-### Setup-GiteaSSH.md
-**Reason**: Obsolete — current workflow uses HTTP URLs + credential manager for Gitea access, not SSH key-based authentication.
-**When to revisit**: If SSH-based Git clones become necessary (e.g., for server-to-server scenarios).
+### PLAN.md (archived 2026-05-10)
+**Reason**: Pianificazione iniziale (ultimo update 2026-05-08) superata dallo stato post Sprint 8.
+Stato corrente del sistema, decisioni tecniche e roadmap sono ora distribuiti tra:
+- `TODO.md` (root) per audit trail, summary status e backlog
+- `docs/ARCHITECTURE.md` per il design del sistema
+- `docs/CI-FLOW.md` per il flusso operativo
+- `docs/RUNBOOK.md` per il triage incident
+
+Resta come riferimento storico.
 
 ### TEST-7.4-e2e.md
 **Reason**: Sprint 7.4 refactor validation document. Specific to §7.4 Deploy↔Setup refactor completion testing.
@@ -16,6 +22,13 @@ Date: 2026-05-10
 - Post-refactor sign-off checklist
 **Useful for**: §6.6 (Toolchain Tier-1) template updates, Linux template setup (§6.1)
 
+## De-archived
+
+### Setup-GiteaSSH.md (restored 2026-05-10)
+Originariamente archiviato come "obsolete (HTTP+credential manager)" ma di fatto il workflow
+live (`gitea/workflows/build-nsis.yml`) e `Setup-Host.ps1` continuano a usare l'alias SSH
+`gitea-ci` (porta 2222) per i clone Git. Ripristinato in `docs/Setup-GiteaSSH.md`.
+
 ## Active Documentation
 
 All current, operational docs remain in parent directory:
@@ -24,7 +37,8 @@ All current, operational docs remain in parent directory:
 - CI-FLOW.md
 - HOST-SETUP.md
 - WINDOWS-TEMPLATE-SETUP.md
+- LINUX-TEMPLATE-SETUP.md (draft for §6.1)
 - OPTIMIZATION.md
 - RUNBOOK.md
 - TEST-PLAN-v1.3-to-HEAD.md
-- LINUX-TEMPLATE-SETUP.md (draft for §6.1)
+- Setup-GiteaSSH.md