feat: move the terminal fully into the ssh-terminal plugin (B9)

drizzle/postgres/0039_violet_firedrake.sql

@@ -0,0 +1,5 @@
+-- command_history moved to the ssh-terminal plugin, whose first migration
+-- renames it to p_ssh_terminal_command_history. Dropping it here would lose
+-- every saved command, so this only stops drizzle tracking it. SELECT 1
+-- because MySQL rejects an empty query.
+SELECT 1;

drizzle/postgres/meta/_journal.json

@@ -274,6 +274,13 @@
       "when": 1790201004950,
       "tag": "0038_cute_vermin",
       "breakpoints": true
+    },
+    {
+      "idx": 39,
+      "version": "7",
+      "when": 1790208809860,
+      "tag": "0039_violet_firedrake",
+      "breakpoints": true
     }
   ]
 }