feat(b5): add systemd unit files for CI periodic tasks (Linux host)

Implements the repo-side artifacts of Phase B5 (plans/implementation-plan-A-B.md). Creates 5 .service + .timer pairs under deploy/systemd/ that replicate the periodic tasks registered on Windows by scripts/Register-CIScheduledTasks.ps1:

  - ci-cleanup-orphans       -> python -m ci_orchestrator vm cleanup --max-age-hours 6 (every 6h + boot)

  - ci-retention-policy      -> pwsh Invoke-RetentionPolicy.ps1 (daily 03:00)

  - ci-watch-disk-space      -> python -m ci_orchestrator monitor disk (every 15min)

  - ci-watch-runner-health   -> python -m ci_orchestrator monitor runner (every 15min)

  - ci-backup-template       -> pwsh Backup-CITemplate.ps1 (weekly Sun 02:00, NEW)

Includes deploy/systemd/README.md with mapping table, install/test/rollback instructions, and PowerShell Core install note for the two PS-only scripts. Plan checklist updated; B5-closeout.md added. Hardware install steps (systemctl enable + smoke) remain user responsibility on the Linux host.
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# systemd units — Local CI/CD System (Linux host)
Coppie `*.service` + `*.timer` che replicano i task periodici registrati su
Windows da `scripts/Register-CIScheduledTasks.ps1`. Pensate per essere
installate su un host Linux Mint / Ubuntu LTS, con il package
`ci_orchestrator` installato in `/opt/ci/venv/`.
## Mapping Windows Task Scheduler → systemd timer
| Windows Task Scheduler | systemd unit | Cadenza | Comando |
| ----------------------- | ---------------------------------- | ----------------------- | --------------------------------------------------------------- |
| `CI-CleanupOrphans` | `ci-cleanup-orphans.timer` | every 6h + at boot | `python -m ci_orchestrator vm cleanup --max-age-hours 6` |
| `CI-RetentionPolicy` | `ci-retention-policy.timer` | daily 03:00 + at boot | `pwsh Invoke-RetentionPolicy.ps1` (vedi nota PowerShell) |
| `CI-DiskSpaceAlert` | `ci-watch-disk-space.timer` | every 15 min | `python -m ci_orchestrator monitor disk` |
| `CI-RunnerHealth` | `ci-watch-runner-health.timer` | every 15 min | `python -m ci_orchestrator monitor runner` |
| *(nuovo)* | `ci-backup-template.timer` | weekly Sun 02:00 | `pwsh Backup-CITemplate.ps1` (vedi nota PowerShell) |
## Nota PowerShell su Linux
Due unit (`ci-retention-policy`, `ci-backup-template`) invocano script
PowerShell che, per scelta documentata in `AGENTS.md` ("Mappatura script
PowerShell → Python"), restano in PowerShell. Su Linux questo richiede
**PowerShell Core (`pwsh`)**:
```bash
# Ubuntu / Mint LTS
sudo apt-get update
sudo apt-get install -y wget apt-transport-https software-properties-common
wget -q https://packages.microsoft.com/config/ubuntu/$(lsb_release -rs)/packages-microsoft-prod.deb
sudo dpkg -i packages-microsoft-prod.deb
sudo apt-get update
sudo apt-get install -y powershell
pwsh --version # verifica
```
Se preferisci non installare `pwsh`, porta `Invoke-RetentionPolicy.ps1` e
`Backup-CITemplate.ps1` come sub-comandi `python -m ci_orchestrator
retention run` / `template backup` (out of scope B5 per il piano corrente
— vedi `plans/implementation-plan-A-B.md`).
## Prerequisiti
1. Utente di sistema `ci-runner` con UID dedicato (creato in B1).
2. Venv Python attivo in `/opt/ci/venv/` con `ci_orchestrator` installato:
```bash
sudo -u ci-runner /opt/ci/venv/bin/pip install -e /opt/ci/local-ci-cd-system
```
3. Variabili d'ambiente `CI_*` definite in `/etc/ci/environment` (caricato
tramite `EnvironmentFile=` in ogni unit `.service`):
```
CI_ROOT=/var/lib/ci
CI_TEMPLATES=/var/lib/ci/templates
CI_BUILD_VMS=/var/lib/ci/build-vms
CI_ARTIFACTS=/var/lib/ci/artifacts
CI_KEYS=/etc/ci/keys
PYTHONIOENCODING=utf-8
```
4. `Invoke-RetentionPolicy.ps1` e `Backup-CITemplate.ps1` presenti in
`/opt/ci/local-ci-cd-system/scripts/` (clone del repo).
## Installazione
```bash
# 1. Copia le unit in /etc/systemd/system/
sudo cp deploy/systemd/ci-*.service deploy/systemd/ci-*.timer /etc/systemd/system/
# 2. Reload systemd
sudo systemctl daemon-reload
# 3. Abilita + avvia tutti i timer
for t in ci-cleanup-orphans ci-retention-policy ci-watch-disk-space \
ci-watch-runner-health ci-backup-template; do
sudo systemctl enable --now "${t}.timer"
done
# 4. Verifica
systemctl list-timers --all 'ci-*'
```
## Test e troubleshooting
```bash
# Trigger manuale di un singolo task (esegue il .service una volta)
sudo systemctl start ci-cleanup-orphans.service
# Log dell'ultima esecuzione
journalctl -u ci-cleanup-orphans.service -n 50 --no-pager
# Live tail di tutti i task CI
journalctl -u 'ci-*' -f
```
## Rollback
```bash
for t in ci-cleanup-orphans ci-retention-policy ci-watch-disk-space \
ci-watch-runner-health ci-backup-template; do
sudo systemctl disable --now "${t}.timer"
sudo rm -f "/etc/systemd/system/${t}.service" "/etc/systemd/system/${t}.timer"
done
sudo systemctl daemon-reload
```
A questo punto il fallback è ri-attivare i task su Windows con
`scripts/Register-CIScheduledTasks.ps1`.