feat: release 2.2.1-SAC — phase 2 manifest verify and quiet SAC updates

Pinned GIT_REF/verify, release manifest, no blind reset --hard; suppress
lifecycle and watchdog Telegram during updater; healthcheck via json.dumps.

release/manifest-2.2.0-SAC.json

@@ -0,0 +1,11 @@
+{
+  "version": "2.2.0-SAC",
+  "git_commit": "275d305d627b462cae141605a002002525aa474c",
+  "files": {
+    "ssh-monitor": "sha256:517e4a210f271f57717b77746352ce2c60579cf89958c1c36501951901b885d0",
+    "sac-client.sh": "sha256:ffcbb0ed28e4247ccb5e74dd6e77d020f93eab8a17f9716e8913a17bc899274b",
+    "update_ssh_monitor.sh": "sha256:8108dd703095d54d51070933f074c90805f383967a3d2a6d63825898ad483231",
+    "ssh-monitor-watchdog": "sha256:5299bdcb481e7ca1d1042579d5c1ad8b13f3f72c1a6e922bcffd070b6c30ec80",
+    "ssh-monitor-perms.sh": "sha256:c67b56060141f67c651906b31afc220a1040c151fb00f60cc5f2511d6664dc11"
+  }
+}

release/manifest-2.2.1-SAC.json

@@ -0,0 +1,11 @@
+{
+  "version": "2.2.1-SAC",
+  "git_commit": "",
+  "files": {
+    "ssh-monitor": "sha256:9fa2eaadceffe70358d83029668cc9bdc423697626f1c84a62552901490adcd9",
+    "sac-client.sh": "sha256:ffcbb0ed28e4247ccb5e74dd6e77d020f93eab8a17f9716e8913a17bc899274b",
+    "update_ssh_monitor.sh": "sha256:5e27e3514532500b84d8eca67bb968ee1dde365564ce4c3710422c43e090dc72",
+    "ssh-monitor-watchdog": "sha256:d1e786247433b6340a8fd2f1578abb2933149fc328f7d0dd7dcfd2319b94dedd",
+    "ssh-monitor-perms.sh": "sha256:86c919032294d47a4daf6681fd6e527babfacf778340dd4c0bcb33f63e5d063e"
+  }
+}