Aplicar limite de complexidade ciclomática 10 e reduzir erros do Clippy

[Pantani]

Summary

• Configura clippy para tratar cognitive_complexity como erro com limite máximo de 10.
• Refatora pontos de alta complexidade em src/cli/*, src/toolchain/fix.rs e testes de integração para eliminar os avisos sem adicionar allow.
• Mantém o escopo restrito à configuração e à redução da complexidade; sem mudanças de regra extra ou dependências.

Testing

• cargo clippy --locked --all-targets --all-features -- -D warnings
• cargo fmt --all --check
• cargo test --locked

[ecc-tools]

ECC bundle files are already tracked in this repository. Skipping generation of another bundle PR.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 45120b94-9b7c-4a60-a8e3-867f11f52806

📥 Commits

Reviewing files that changed from the base of the PR and between ed110a4 and 4f99334.

📒 Files selected for processing (19)

• Cargo.toml
• clippy.toml
• src/cli/app.rs
• src/cli/chain.rs
• src/cli/scaffold.rs
• src/config/loader.rs
• src/toolchain/fix.rs
• tests/generate.rs
• tests/integration_chain.rs
• tests/integration_generate.rs
• tests/integration_onboarding.rs
• tests/integration_scaffold.rs
• tests/onboarding_examples_learn.rs
• tests/scaffold_account.rs
• tests/scaffold_error.rs
• tests/scaffold_event.rs
• tests/scaffold_instruction.rs
• tests/scaffold_program.rs
• tests/scaffold_recipes.rs

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