Add self-maintaining Athena platform context MCP

platform/systemd/mike-ai-platform-context-snapshot.service

@@ -0,0 +1,16 @@
+[Unit]
+Description=Create bounded MikeAI platform context snapshot
+After=docker.service local-fs.target
+RequiresMountsFor=/data
+
+[Service]
+Type=oneshot
+ExecStart=/usr/local/libexec/mike-ai-platform-context-snapshot
+User=root
+Group=root
+NoNewPrivileges=true
+PrivateTmp=true
+ProtectHome=true
+ProtectSystem=strict
+ReadWritePaths=/var/lib/mike-ai-platform-context
+