Rules as Written do not state.
Rules as Intended, it would be far more sensible that some sort of condition that affects you must occur for the contingency to go off.
Your perception has no bearing, yet some condition should occur that affects you. Otherwise it may count as "convoluted and complicated", which may cause the spell combination to fail.
A butterfly flapping its wings a continent away wouldn't trigger a contingency as said effect is negligible to you. Having a spell trigger should a butterfly touch you is a clearly definable condition, and it does not matter if you are aware of it or not - only that it happens to the being that has a contingency spell active.
Some things are fuzzy and might cause the spell to fail, so be careful how you phrase the contingency. As an example - Phrasing that a glitterdust spell activates if an invisible being is 30 feet or closer to you might cause the spell to fail, since it is not a condition that directly affects you. Having glitterdust go off if you detect an invisible being 30 feet from you (by using see the invisible, true seeing, or have been touched by an invisible being) would have a greater likeliness of setting off glitterdust as planned.
By RAW, technically the answer is yes, but I personally would not allow it because it would be too easily abused, particularly with divination spells. I do not believe that your suggested usage was ever intended.
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By RAW yes though you need to keep in mind that,
The spell to be brought into effect by the contingency must be one that affects your person
Your examples don't quite fit into such a category (maybe warming your shirt would I suppose). Normally it will be a targeted or AoE spell (probably a buff but could be something such as dispel magic, break enchantment etc for specific situtions you have prepared for).
Yes the limitation of the spell is that it is not linked to the Will of the caster after it is cast. But the spell is not omnipotent and it cannot be used to see around corners so to say.
And this part of the discription leaves it all in the GMs hands:
"If complicated or convoluted conditions are prescribed, the whole spell combination (contingency and the companion magic) may fail when triggered. The companion spell occurs based solely on the stated conditions, regardless of whether you want it to."
This is from the Cleaves.
86. amulet of defensive spells
This stores 3 spell levels (Such as 3 shield spells) that activate defensively(Spells must come from the wearer). Construction costs will be posted when I get them.
Hook: The emblem of a family of magic users is engraved on the back as well as a password that a secret society of do gooders will respond to.
So in constructing the amulet I need to start with a masterwork amulet and contingency, right?
This is from the Cleaves.
86. amulet of defensive spells
This stores 3 spell levels (Such as 3 shield spells) that activate defensively(Spells must come from the wearer). Construction costs will be posted when I get them.
Hook: The emblem of a family of magic users is engraved on the back as well as a password that a secret society of do gooders will respond to.So in constructing the amulet I need to start with a masterwork amulet and contingency, right?
No, I think Ring of Spell Storing is a closer match, and it uses Imbue With Spell Ability in its construction.
I would say yes, that could work.
With your example, Nondetection is not guaranteed to stop them from Scrying you though it does improve your odds by quite a bit.
So, "If I fail to resist detection by a scrying spell, cast nondetection on myself." ?
Since a will save implies a direct effect on your brain/mind and active interaction.
This one is up to your GM. I could easily see it fail because it uses kind of game mekanic langurage and no one in game know that. And also because it aklo the contingensi spell to game the system so to say. To see things that you cannot see. Or it couns activate every time someone look at you with detect magic or fail when some one attack you with truestrike or when you cast moment of prescience on your self. Or it could work.
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Owner - D20 Hobbies
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1) "If Joe begins talking or writing about me when I am more than 200 feet away, cast scry on Joe."
2) "If any halfing anywhere in the material plane sneezes while wearing an orange shirt, cast prestidigitation to make my shirt warm."
3) "If an invisible creature with an evil aura comes within 50 feet of me, cast dancing lights 6 inches above their head."
4) "If I fail to resist detection by a scrying spell, cast nondetection on myself." ?
Contingency isn't divination magic. Your things are not spells cast on yourself. I'm going to modify each to be Shield on the caster instead.
1) No line of effect to Joe, so no.
2) No line of effect to the halfling, so no.
3) Line of effect (assuming no Wall of Force etc) so ask your GM.
4) Line of effect and affects you, so yes.