builtins: add window n xs for sliding windows#213
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Sliding windows are essential for moving averages, n-gram extraction, local feature detection, and any time-series smoothing. Hand-rolling needs nested indexing and bounds checks, which is verbose and bug-prone on short inputs. window n xs returns a list of n-sized contiguous sublists. Empty when n > len(xs) or n < 1. Opcode 146 across tree, vm, cranelift.
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Sliding windows are essential for moving averages, n-gram extraction, local feature detection, time-series smoothing. Hand-rolling needs nested indexing with bounds checks.
Implementation:
Tests: 6 cross-engine regression tests + examples/window.ilo with -- run: directives.