It took a 72 hour soak in WD40 and two bent punches, but the pin finally came out and after that getting the bolt the rest of the way apart was not difficult. I found the extractor spring caked in rust and the spring slot inside the extractor clogged with rust. I am mildly astonished the rifle still functioned. I cleaned it out, scrubbed off the extractor spring and reused it since I don't have a spare, gave everything a very light coat of Mobil 1 5w30 synthetic, and got the bolt back together. I hope it'll come apart easier the next time. The punch in the cleaning kit is still quite a bit oversized to fit the firing pin retaining pin hole through the bolt, but that's minor.
Thanks again.