Out of curiosity, I downloaded the year 134 save and retired the fort. By spawning a "human outsider" hero, I may have solved the mystery of why no-one's been sieging you:
The next shop over, are goblin and dwarven leatherworkers working quite cheerfully together.
It was originally the capitol of a goblin civ called "The Tactical Horror", but The Bodices of Paint began attacking them in 51, joined soon after by the humans of The Geared Empires in 94. Unitespider fell in 105 and was annexed by The Bodices of Paint. The governor installed there instituted a massive digging project called "The Mansion of Mining" and had built the "Cathedral of Starvation" to remind the goblins what happened to those who tried to rebel. A former slave of the humans from Savedtrees journeyed to Unitespider in 106 and was hired as both cultural liaison and General of their combined dwarven/goblin forces.
The Geared Empires continued to persecute a "War of Skinning" against the goblins, pillaging Unitespider several times more in their zeal, which led to some dwarven conflict with the governor there as well. Any adventurer wishing to hire a mercenary from either the dwarven or human camps within the city should be aware that tensions are still fresh from the constant pillaging and enslavement of any goblin, dwarf or human that makes Unitespider their home...
It's interesting to note that all goblin resistance had pretty much ended by 113. A militant camp far to the southwest of Unitespider called "Witcharrows" attempted to maintain their independence from outside rule, but frequent attacks by humans bearing skinning knives and elves bearing murderous bows contested that attempt quite strenuously until by the winter of 113, the elven assaults met no resistance whatsoever. Succeeding sweeps by human and elven forces mopped up any stragglers until by 121, they'd successfully destroyed that camp, the Geared Empire annexing a couple of the free-gob hamlets nearby into the Empire.
Stokershoots may indeed be ahead of its time trying to be more human-like. If The Geared Empire has its way, it'll try to annex everyone else before too long.