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Day 10 of the 30-day iOS series, the build-in-public finale of AI week. I took the on-device Foundation Models stack from Days 8 and 9 and bolted it into ThinkBud, an app I actually ship. Here's the honest field report: the bounded tasks the on-device model nailed for free and offline, the context-window wall a 100K-character textbook import smashed into, and the exact line of code where I gave up and routed to a server. Plus the one decision that's pure Swift — so it gets a real test.
