feat(examples): programa-demo para a apresentação final#171
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Adiciona src/examples/demo_presentation.c com um programa curto que combina variaveis/expressoes, funcao recursiva (factorial) e controle de fluxo (if/while), dentro do subconjunto estavel do backend atual (sem struct/ponteiro/switch, ainda nao suportados no codegen). Documenta a saida esperada (exit code 80) no cabecalho do arquivo e adiciona um smoke test (smoke_presentation_demo_runs) que compila e executa o exemplo de ponta a ponta via gcc, garantindo que ele continue funcionando com o pipeline atual. Resolve #163
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Jun 24, 2026
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Revisado, tudo certo!
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Resumo
src/examples/demo_presentation.c: um programa curto (factorial recursivo + soma de quadrados de pares viawhile/if) que demonstra variáveis/expressões, funções e controle de fluxo — tudo dentro do subconjunto de C que o backend já suporta de forma estável.struct, ponteiros eswitchnão foram usados no demo porque o lowering ainda não suporta atribuição via ponteiro/struct nemswitch(ver também a nota equivalente no PR test(e2e): bateria de testes ponta a ponta para os casos centrais da linguagem #170).80(factorial(4) = 24+sum_even_squares(6) = 56).smoke_presentation_demo_runsemtests/exe_smoke_test.rs, que compila e executa o exemplo de ponta a ponta viagcce confere o exit code, garantindo que o demo continue funcionando conforme o pipeline evolui.Closes #163
Test plan
cargo test --allpassacargo clippy --all -- -D warningssem avisoscargo fmt --checksem diffscargo run -- src/examples/demo_presentation.c -o demo && ./demo; echo $?deve imprimir80