Say the terminal explicitly, only from a login session, and name the unannounced pull request (hq ADR 0272)

- commandEnvironment takes the terminal as a bool instead of reading an
  empty verb as one; every non-terminal line names its verb and is stripped
  of MESH_CLI_TERMINAL, and a test with the mark set in the serving
  environment fails when that strip is taken out.
- On the control-node the operator's account is the terminal only from a
  login session, as the node-engine reads it from the kernel's cgroup; the
  tool runner and the account's user units run as the operator too, and are
  ordinary calls. The request carries `session` (field-name tests on both
  sides).
- A pull request the forge never announced is named with its number in
  the condition's headline (hq issue 347), from the stalled line's
  `number`, which mesh-delivery sends.

internal/link/meshcli_test.go

@@ -17,7 +17,11 @@ import (
 // The node-engine's request and the answer it hands mesh-cli hold these field names; the engine's side holds the
 // same list (mesh-host internal/meshcli, TestTheRequestToTheControllerKeepsItsFieldNames).
 func TestTheMeshCLIRequestAndAnswerKeepTheirFieldNames(t *testing.T) {
-	body, _ := json.Marshal(CLIAsked{Line: []string{"status"}, Account: "a", UID: 1})
+	body, _ := json.Marshal(CLIAsked{Line: []string{"status"}, Account: "a", UID: 1, Session: "session-3.scope"})
+	if got := keysIn(t, body); got != "account line session uid" {
+		t.Fatalf("the request's fields are %q", got)
+	}
+	body, _ = json.Marshal(CLIAsked{Line: []string{"status"}, Account: "a", UID: 1})
 	if got := keysIn(t, body); got != "account line uid" {
 		t.Fatalf("the request's fields are %q", got)
 	}