verifier + interpreter: closure-bind ctx arg for srt/map/flt/fld#186
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HOFs like srt map flt fld accept an inline lambda for the predicate. The lambda needs access to the outer scope (ctx). The verifier was rejecting closures over ctx, and the interpreter was not binding the captured environment. Both sides now agree: a closure passed to a HOF gets its enclosing scope threaded through on each call. Unlocks idiomatic top-N, key-fn sort, and group-style reductions.
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HOFs were rejecting closures over outer scope. Verifier and interpreter now agree: a lambda passed to srt map flt fld threads its enclosing environment through on each call.
Implementation:
Unlocks idiomatic top-N, key-fn sort, and reduce-with-accumulator patterns.
Tests: cross-engine regression tests + examples/closure-bind.ilo with -- run: directives.