Python 3.15 is out: lazy imports (PEP 810), unpacking in comprehensions (PEP 798), a new sampling profiler; 3.10 hits EOL

lazy import defers module loading to first use; cProfile becomes profiling.tracing with the Tachyon sampling profiler alongside it. Performance roughly matches 3.14 per Miguel Grinberg's rc3 tests; the experimental JIT gave 1.2x on Fibonacci.