praxis-cli 0.2.0

The `praxis` command-line tool: run, check and debug Praxis programs.
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// A clean, M1-valid Praxis snippet for the `check` happy-path test.
// Covers `var` bindings, a fn, arithmetic, if, while, and an out call —
// the full Milestone 1 grammar subset.
fn manhattan(a: Int, b: Int) -> Int {
    abs(a - b)
}

var width = 3
var score = 0

while score < width {
    score = score + 1
}

if score == width {
    out(score)
}