builtins: add range a b for arithmetic sequences#208
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Arithmetic sequences come up constantly in agent tasks (iterating 0..n, generating axis ticks, building index lists). Without a builtin, agents spend tokens on recursive constructors or unfold patterns. range a b returns the half-open integer sequence [a, b) as L n, empty when a >= b. Opcode 138 across tree, vm, cranelift. Cap at 1M elements to bound allocations from a runaway agent.
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Arithmetic sequences are bread-and-butter for agent tasks (iterating 0..n, axis ticks, index lists). Without a builtin, agents waste tokens on recursive unfolds.
Implementation:
Tests: 15 cross-engine regression tests + examples/range.ilo with -- run: directives.