feat(v4.0.0): a line from the console breaks a wait

Text for a node from its console, arriving while the node waits for an
answer (AWAIT), is kept as any message is; the wait ends in error 21,
Interrupted; and the text is then done as usual.  Console text for
another node, passing through a node that is waiting, does not end its
wait.

On the hosted program 5 AWAIT ended the program with "the node stopped".
The boot now reports that the line is waiting, the host reads the next
line and hands it over, which breaks the wait, and then has the kept line
done.  The bare-metal host does the same; it is booted in the commit that
follows.

test_host_mesh.c: 76 checks, both widths and the sanitizers.  hosted-check
types 5 AWAIT and two more lines: Interrupted, then 3 and 56.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

v4/tests/test_host_mesh.c

@@ -317,6 +317,17 @@ int main(void)
         CHECK(is_empty(tell(11, ": P12 S\" 1 DROP\" 12 SEND ; P12")) && pool[1].n.mem[REFUSED] == refused + 1, "having forgotten the way to 12, what node 11 sends there goes toward its centre, which has no way either, and is refused");
         CHECK(is_empty(tell(10, "12 2 ROUTE")) && is_empty(tell(11, "12 3 ROUTE")) && strcmp(tell(12, "7 8 * ."), "56 ") == 0, "told the way again, they reach 12 as before");
     }
+    /* a line from the console breaks a wait (MESH.md 7b.6) */
+    CHECK(is_empty(tell(10, "12 AWAIT .")) && ended == 0 && pool[0].n.mem[AWAIT_FROM] == 12 && waiting(hera), "node 10 waits for an answer from 12, which is not going to send one");
+    CHECK(is_empty(tell(11, "20 22 + .")) && ended == 0 && pool[0].n.mem[AWAIT_FROM] == 12, "text from the console for node 11 comes to node 10 on its way: node 10 keeps it, and goes on waiting");
+    {
+        const char *r = tell(10, "65 EMIT");
+        CHECK(strstr(r, "Interrupted\n") != NULL && pool[0].n.mem[AWAIT_FROM] == 0, "text from the console for node 10 itself ends its wait, with an error that says so: \"%s\"", r);
+        CHECK(strstr(r, "A") != NULL && strstr(r, "42 ") != NULL && ended == 3, "the line is then done as usual, and so is what was kept for node 11: \"%s\", %d ended", r, ended);
+        CHECK(strstr(r, "Interrupted\n") < strstr(r, "A"), "the wait ends before the line that ended it is done");
+    }
+    CHECK(strcmp(tell(10, "1 2 + ."), "3 ") == 0 && waiting(hera) && waiting(mid) && waiting(far), "and all three go on as before");
+
     CHECK(strstr(tell(10, "5 NO-ROUTE"), "ERROR") == NULL && strcmp(tell(11, "20 22 + ."), "42 ") == 0, "forgetting the way to a node there was no way to changes nothing");
 
     printf("  %d checks, %d failures\n", checks, failures);