fix(template): blocants laptop — metabolism, scripts VPS, profil/contexts

- metabolism/README.md créé (référencé par 3 contexts)
- scripts/brain-watch-vps.sh : paths /home/tetardtek → <user>, git url → <GITEA_URL>
- scripts/install-brain-watch.sh : path hardcodé → <user>
- scripts/kernel-isolation-check.sh : commentaire exemple → alice
- profil/contexts/ : session-deploy + session-handoff supprimés (owner-specific)

Vérification : grep tetardtek → ZÉRO FUITE ABSOLUE

scripts/install-brain-watch.sh

@@ -106,7 +106,7 @@ After=network.target
 [Service]
 Type=simple
 User=root
-ExecStart=/home/tetardtek/brain-watch/brain-watch-vps.sh
+ExecStart=/home/<user>/brain-watch/brain-watch-vps.sh
 Restart=always
 RestartSec=10
 StandardOutput=journal