hivectl: add start/stop agent verbs, rename spawn to create

hivectl/src/cli.rs

@@ -468,14 +468,22 @@ pub enum AgentCmd {
     Pause,
     /// Resume this paused agent — it drains whatever queued up while parked.
     Resume,
-    /// Spawn this agent container directly, bypassing the approval queue.
+    /// Start this EXISTING agent container. Fails immediately if `name`
+    /// has no config/topology entry at all — it never attempts
+    /// first-time creation. Use `create` for that.
+    Start,
+    /// Create this agent container from scratch (full first-time
+    /// provisioning), bypassing the approval queue.
     ///
-    /// Operator-on-the-host only; use `request-spawn` for an approval-gated
-    /// spawn.
-    Spawn,
-    /// Queue a spawn request for operator approval.
-    RequestSpawn,
-    /// Stop this managed container (graceful).
+    /// Operator-on-the-host only; use `request-create` for an
+    /// approval-gated creation.
+    Create,
+    /// Queue a first-creation request for operator approval.
+    RequestCreate,
+    /// Gracefully stop this agent container: signal → drain → reconcile.
+    /// Never escalates to a hard kill — use `kill` for that.
+    Stop,
+    /// Hard-stop this managed container.
     Kill,
     /// Tear down this sub-agent container, keeping its state by default.
     /// No undo.