Move CEIL macro to basic.h and remove unnecessary heartbeat reset

- Move the CEIL macro from config.h to basic.h alongside MIN/MAX, and
  use it in deadline_to_timeout for the rounding-up division
- Remove the heartbeat reset in complete_view_change_and_become_primary
  since it was not needed — heartbeat is already set when the node
  enters STATUS_CHANGE_VIEW, which is close enough in time

https://claude.ai/code/session_0184gHjra7fsmSPZ4kppaGhC

src/basic.c

@@ -74,7 +74,7 @@ int deadline_to_timeout(Time deadline, Time current_time)
     if (deadline <= current_time)
         return 0;
     // Round up so sub-millisecond deadlines become 1ms, not 0
-    return (deadline - current_time + 999999) / 1000000;
+    return CEIL(deadline - current_time, 1000000);
 }
 
 bool getargb(int argc, char **argv, char *name)

src/basic.h

@@ -37,6 +37,7 @@ typedef uint64_t Time;
 
 #define MIN(X, Y) ((X) < (Y) ? (X) : (Y))
 #define MAX(X, Y) ((X) > (Y) ? (X) : (Y))
+#define CEIL(X, Y) (((X) + (Y) - 1) / (Y))
 
 #define UNREACHABLE __builtin_trap();
 

src/config.h

@@ -12,6 +12,5 @@
 #define REPLICATION_FACTOR 2
 #define CHUNK_SIZE 32
 #define MAX_TRANSFERS (META_CHUNKS_MAX * REPLICATION_FACTOR)
-#define CEIL(X, Y) (((X) + (Y) - 1) / (Y))
 
 #endif // CONFIG_INCLUDED

src/server.c

@@ -517,7 +517,6 @@ complete_view_change_and_become_primary(ServerState *state)
     broadcast_to_peers_ex(state, &begin_view_message.base, state->log.entries, state->log.count * sizeof(LogEntry));
 
     clear_view_change_fields(state);
-    state->heartbeat = state->now;
     return HR_OK;
 }