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Test, Build, and Deploy / test-build-deploy (push) Failing after 56s
Constructor app: (:app (:con NAME) arg) -> (NAME …args). Tuple args
flatten so Pair(a,b) -> ("Pair" a b), matching the parser's pattern
flatten. Standalone (:con NAME) -> (NAME) nullary.
Pattern matcher: :pwild, :pvar, :plit, :pcon (head + arity), :pcons
(decompose), :plist (length match), :ptuple (after tuple tag). Match
walks clauses until first success; runtime error on exhaustion.
Recursive list functions (len, sum, fact) work end-to-end.