v2: Set MEKE_POSITIVE to True

[mathomp4]

Closes GEOS-ESM/MOM6#15

This PR sets MEKE_POSITIVE = True in the MOM_override files per request of @adarmenov

NOTE: I'm labeling as zero-diff as a C12 test showed it was. Not sure if in general it will be.

[adarmenov]

LGTM

[mathomp4]

@sinakhani @adarmenov I was slightly incorrect. It is mostly zero-diff. I forgot to compare the RESTART/MOM.res.nc files. Those are different in MEKE:

> cmpnc4 stock-v12-2025Sep10-1day-c12-MOM6/scratch/RESTART/MOM.res.nc mekepositive-v12-2025Sep10-1day-c12-MOM6/scratch/RESTART/MOM.res.nc
DIFFER : VARIABLE : MEKE : ATTRIBUTE : checksum : VALUES : "9C8202500CECA7AA" <> "82F8662FF9F4925E"
DIFFER : VARIABLE : MEKE : POSITION : [0,7,41] : VALUES : -1.39656e-08 <> 0
DIFFER : VARIABLE : MEKE : POSITION : [0,17,16] : VALUES : -2.85427e-08 <> 0
DIFFER : VARIABLE : MEKE : POSITION : [0,17,17] : VALUES : -1.3021e-10 <> 0
DIFFER : VARIABLE : MEKE : POSITION : [0,17,19] : VALUES : -9.04985e-09 <> 0
DIFFER : VARIABLE : MEKE : POSITION : [0,17,20] : VALUES : -3.72647e-09 <> 0
DIFFER : VARIABLE : MEKE : POSITION : [0,17,21] : VALUES : -1.46024e-08 <> 0
DIFFER : VARIABLE : MEKE : POSITION : [0,17,22] : VALUES : -1.61508e-08 <> 0
DIFFER : VARIABLE : MEKE : POSITION : [0,18,13] : VALUES : -3.50014e-09 <> 0
DIFFER : VARIABLE : MEKE : POSITION : [0,19,56] : VALUES : 4.33477e-10 <> 4.91376e-10
DIFFER : VARIABLE : MEKE : POSITION : [0,20,45] : VALUES : -9.83319e-09 <> 0
DIFFER : VARIABLE : MEKE : POSITION : [0,20,46] : VALUES : -1.36173e-07 <> 0
DIFFER : VARIABLE : MEKE : POSITION : [0,20,47] : VALUES : -2.15561e-08 <> 0
DIFFER : VARIABLE : MEKE : POSITION : [0,21,45] : VALUES : -2.83046e-07 <> 0
DIFFER : VARIABLE : MEKE : POSITION : [0,21,46] : VALUES : -1.59942e-07 <> 0
DIFFER : VARIABLE : MEKE : POSITION : [0,21,47] : VALUES : -2.34159e-07 <> 0
DIFFER : VARIABLE : MEKE : POSITION : [0,21,48] : VALUES : -2.22435e-09 <> 0
DIFFER : VARIABLE : MEKE : POSITION : [0,21,50] : VALUES : -1.41871e-08 <> 0
DIFFER : VARIABLE : MEKE : POSITION : [0,22,44] : VALUES : -7.12217e-08 <> 0
DIFFER : VARIABLE : MEKE : POSITION : [0,22,47] : VALUES : -7.69144e-08 <> 0
DIFFER : VARIABLE : MEKE : POSITION : [0,22,48] : VALUES : -5.37437e-08 <> 0
DIFFER : VARIABLE : MEKE : POSITION : [0,27,54] : VALUES : -6.82991e-08 <> 0
DIFFER : VARIABLE : MEKE : POSITION : [0,28,56] : VALUES : -1.01624e-09 <> 0
DIFFER : VARIABLE : MEKE : POSITION : [0,32,65] : VALUES : 9.48009e-10 <> 9.50239e-10
DIFFER : VARIABLE : MEKE : POSITION : [0,33,9] : VALUES : -1.0196e-09 <> 0
DIFFER : VARIABLE : MEKE : POSITION : [0,34,52] : VALUES : -3.88519e-07 <> 0

I guess MEKE doesn't feed back to the atmosphere in anyway? Because all the GEOS checkpoints were zero-diff.

NOTE: The above numbers are actually for a GEOSgcm v12 run. But I imagine a v11 run would be similar.

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