sync: onboard Howard-Home machine

Added Howard-Home hostname to Howard's known_machines list.
Identity.json created locally (gitignored).

Author: Howard Enos
Machine: Howard-Home

.claude/users.json

@@ -15,7 +15,7 @@
       "email": "howard@azcomputerguru.com",
       "role": "tech",
       "title": "Technician",
-      "known_machines": ["ACG-TECH03L"],
+      "known_machines": ["ACG-TECH03L", "Howard-Home"],
       "git_name": "Howard Enos",
       "git_email": "howard@azcomputerguru.com",
       "gitea_username": "howard",