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Never mind. To externally reference const (which are implicit static), the declaration needs to be as follows:

-prog_char op_max[] PROGMEM = {
+extern prog_char op_max[] PROGMEM = {

In trying to figure this out, I had left in server.cpp
extern const char *op_max;

instead of

extern const char op_max[];

which seems to be deferenced differently and messed up the maximum values.