agra 5491acbcbb ERR/E5.4: add composition section to the errors smoke example ...

Extends 1036-errors-failable-smoke with an end-to-end Composition section
covering the E5.1 forms: a failable closure literal through a Closure(...)
param (try-propagated, caught), a non-failable closure literal widened
into a failable bare slot (∅-widening adapter), and generic ($T)
value-carrying failable composition. Completes E5.4 — the per-feature
examples (1039-1045) remain the focused units; this is the integrated
smoke.

2026-06-01 22:47:58 +03:00

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