32. Matching Literals Against Loaded Input in One Loop

• matchLiteral checked one character at a time, each time recording the examined range, checking that the input was loaded far enough (stream input is read lazily) and indexing relative to the discarded prefix. When the whole input is loaded (every parse except streams), it now compares the literal in one loop and updates the position and the examined range once, with the same results (a mismatch still leaves the position after the matched prefix and examines the first differing character).
• Effect (min of 8 interleaved runs, Apple M3 Max): closure and recursive bytecode backends 1.5–7% faster (minilang closure 16.2 → 15.3 ms, Arith_OperatorsRule closure 10.4 → 9.8 ms, recognition of Arith_OperatorsRule 7.5 → 7.0 ms), except CSV on bytecode (unchanged within noise).