If you lump autoloaders and DA revolvers together nothing has yet proven more rugged than a Glock.
What a pant load.
Proven by whom?
Proven when?
Proven where?
Proven for which model? (They certainly aren't all equal).
My vote goes to the USGI 1911A1.
From the OP:
Ice: The Battle of the Aleutians, Battle of the Bulge, Korea. Several variants served the Norwegian Resistance too.
Sand: Pick a PTO amphib landing--any of them, D-Day, North Africa, still serving today too.
Water, dirt, mud: Western Front in WW1. Vietnam.
Physical trauma: Polymer is going to survive getting hit by shrapnel? I'll take the all steel pistol thanks.
No cleaning, no lubrication etc.: During the XM9 trials, the only pistols which passed the wet and dried mud tests with 100% scores were 1911A1 control models that were a minimum of 40 years old and reassembled time and again using mix mastered small parts.
That's the definition of "proven." Lab queen tests and YouTube videos cannot even begin to compare, but if you want to go there.
http://www.youtube.com/watch?v=0_JuF23qazI
Glock 19. A thousand rounds fired in 14 minutes by several shooters. Five stoppages. Melts out the recoil rod.
http://www.youtube.com/watch?v=Q7wL2QuFTLQ
Para-Ord 1911 (lower quality one) 1000 rounds fired in about eleven minutes by just one shooter. No stoppages and nothing breaks.
Glock reliability is routinely overstated by its fans, who have fallen for sales rep hucksterism. The 1911A1 just goes on kicking ass for a century as the real deal.