Profile-guided optimization in Go 1.21

The Go team's own writeup of profile-guided optimization landing as production-ready: feed the compiler a CPU profile from real traffic, and it makes smarter inlining decisions than static heuristics ever could, often for a meaningful throughput gain with zero code changes. What I like about this piece is how matter-of-fact it is about the mechanics — collect a profile, drop it in as default.pgo, rebuild — no framework, no magic, just the compiler using data it didn't have before. A good example of Go's philosophy of boring, composable tooling done right.

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