feat(cli): expose Gleam as built-in

[DamianReeves]

Summary

• register the native Rust Gleam frontend and backend in the CLI
• default built-ins to typed direct calls while retaining native MEP parity and installed-provider precedence
• add end-to-end compile, generate, roundtrip, document-tree, and override coverage

Dependency

• Depends on feat: add native extension provider paths morphir-rust#141

Test plan

• mise exec -- cargo test -p morphir
• mise exec -- cargo clippy -p morphir --all-targets -- -D warnings
• mise exec -- cargo build -p morphir
• mise exec -- cargo fmt --all -- --check

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[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-01T12:48:09.577389Z	f26bfcd	PR opened

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