t27 basics 15: three loop forms

while, for in a range and the Zig-style for, each checked with the real t27 compiler, and a range drawn step by step. Lesson 15 of the t27 basics course.

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Where the numbers come from

The lesson spec public/t27/files/specs/basics/15_loops.t27, compiled clean on 7 backends by public/t27/t27_compiler.wasm, whose tests pass in the site test runner
Compiler verdicts, error lines, code and counts quoted on this page are what the same wasm answered in node 22 when the course was authored; words without a run behind them are said to be read, not run

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