AI review feedback: variable initialization, comments, headers

src/test/app/SHAMapStore_test.cpp

@@ -671,6 +671,9 @@ public:
                     {
                         std::this_thread::sleep_for(100ms);
                     }
+                    // Even the slowest machines should be able to finalize deleteSeq within 4
+                    // loops (400ms). If this test ever actually fails feel free to lower this
+                    // cutoff.
                     BEAST_EXPECTS(iterations > 25, to_string(iterations));
                 }
                 lm.clearLedger(deleteSeq);
@@ -699,8 +702,9 @@ public:
                 // Close another ledger, which will trigger a rotation, but the
                 // rotation will be stuck until the missing ledger is filled in.
                 env.close();
-                // DO NOT CALL rendezvous() without a timeout parameter! You'll end up with a
-                // deadlock.
+                // Do not call rendezvous() here without a timeout; it will block until the missing
+                // ledger is backfilled. That will not happen automatically. It's a manual step that
+                // is done later in this test.
                 ++maxSeq;
 
                 // Nothing has changed