js-on-sx: baseline commit (278/280 unit, 148/148 slice, runner stub)

Initial commit of the lib/js/ tree and plans/ directory. A previous
session left template-string work in progress — 278/280 unit tests pass
(2 failing: tpl part-count off-by-one, escaped-backtick ident lookup).
test262-runner.py and scoreboard are placeholders (0/8 with 7 timeouts);
fixing the runner is the next queue item.

lib/js/test262-slice/functions/arrow_add.expected

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+42

lib/js/test262-slice/functions/arrow_add.js

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+(x => x + 1)(41)

lib/js/test262-slice/functions/arrow_block.expected

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+22

lib/js/test262-slice/functions/arrow_block.js

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+let f = x => { let y = x + 1; return y * 2; }; f(10)

lib/js/test262-slice/functions/arrow_curry.expected

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+7

lib/js/test262-slice/functions/arrow_curry.js

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+(x => y => x + y)(3)(4)

lib/js/test262-slice/functions/arrow_identity.expected

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+42

lib/js/test262-slice/functions/arrow_identity.js

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+(x => x)(42)

lib/js/test262-slice/functions/arrow_multi_arg.expected

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+7

lib/js/test262-slice/functions/arrow_multi_arg.js

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+((a,b) => a + b)(3,4)

lib/js/test262-slice/functions/arrow_zero.expected

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+42

lib/js/test262-slice/functions/arrow_zero.js

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+(() => 42)()

lib/js/test262-slice/functions/closure_ref.expected

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+21

lib/js/test262-slice/functions/closure_ref.js

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+function compose(f, g) { return x => f(g(x)); } let addOne = x => x + 1; let double = x => x * 2; compose(addOne, double)(10)

lib/js/test262-slice/functions/default_param.expected

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+25

lib/js/test262-slice/functions/default_param.js

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+function f(x = 10, y = 20) { return x + y; } f(5)

lib/js/test262-slice/functions/func_decl.expected

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+42

lib/js/test262-slice/functions/func_decl.js

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+function add(a, b) { return a + b; } add(17, 25)

lib/js/test262-slice/functions/higher_order.expected

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+81

lib/js/test262-slice/functions/higher_order.js

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+function twice(f, x) { return f(f(x)); } twice(n => n * n, 3)

lib/js/test262-slice/functions/iife.expected

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+81

lib/js/test262-slice/functions/iife.js

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+(function(x) { return x * x; })(9)

lib/js/test262-slice/functions/math_abs.expected

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+5

lib/js/test262-slice/functions/math_abs.js

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+Math.abs(-5)

lib/js/test262-slice/functions/math_ceil.expected

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+4

lib/js/test262-slice/functions/math_ceil.js

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+Math.ceil(3.1)

lib/js/test262-slice/functions/math_floor.expected

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+3

lib/js/test262-slice/functions/math_floor.js

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+Math.floor(3.9)

lib/js/test262-slice/functions/math_max.expected

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+5

lib/js/test262-slice/functions/math_max.js

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+Math.max(1,5,3)

lib/js/test262-slice/functions/math_min.expected

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+1

lib/js/test262-slice/functions/math_min.js

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+Math.min(1,5,3)

lib/js/test262-slice/functions/math_pi_gt_3.expected

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+true

lib/js/test262-slice/functions/math_pi_gt_3.js

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+Math.PI > 3

lib/js/test262-slice/functions/recursion_fact.expected

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+720

lib/js/test262-slice/functions/recursion_fact.js

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+function fact(n) { if (n <= 1) return 1; return n * fact(n - 1); } fact(6)

lib/js/test262-slice/functions/recursion_fib.expected

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+144

lib/js/test262-slice/functions/recursion_fib.js

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+function fib(n) { if (n < 2) return n; return fib(n-1) + fib(n-2); } fib(12)

lib/js/test262-slice/functions/rest_param.expected

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+21

lib/js/test262-slice/functions/rest_param.js

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+function sum(...xs) { let t = 0; for (let i = 0; i < xs.length; i = i + 1) t = t + xs[i]; return t; } sum(1,2,3,4,5,6)