🧹 Refactor dead code allowance in parse-extended modules

[undivisible]

🎯 What: Replaced the #[cfg_attr(not(feature = "parse-extended"), allow(dead_code))] workaround with conditional compilation (#[cfg(feature = "parse-extended")]) for extended parser modules in in-cli/src/compiler/tree_front/mod.rs.

💡 Why: When the parse-extended feature was disabled, several language modules were being unconditionally compiled, resulting in legitimate dead code since their extraction functions were never called. Suppressing these warnings with allow(dead_code) hides the issue and compiles unnecessary code. Conditionally compiling these modules entirely removes the dead code, adheres to Rust idioms, and slightly improves compile times when the feature is off.

✅ Verification:

1. Ran cargo clippy --all-targets --locked -- -D warnings (without feature) and verified that the previously unused modules are no longer compiled and no warnings are emitted.
2. Ran cargo clippy --all-targets --features parse-extended --locked -- -D warnings and verified that the modules compile cleanly when the feature is enabled.
3. Ran cargo test in in-cli to ensure no functionality or tests were broken.

✨ Result: The codebase is cleaner, idiomatic conditional compilation is used, and the dead code allowance is removed without introducing new warnings.

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PR created automatically by Jules for task 6891197299170310659 started by @undivisible

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Note

Low Risk
Build-configuration-only change in parser module wiring; behavior should match existing feature-gated routing in extract.rs.

Overview
Extended Tree-sitter language fronts in tree_front/mod.rs are now gated with #[cfg(feature = "parse-extended")] instead of always compiling those modules and silencing dead-code warnings when the feature is off.

When parse-extended is disabled, parsers such as C#, Dart, Elixir, Erlang, F#, Haskell, Julia, Kotlin, OCaml, PHP, R, Scala, and V are no longer built at all, matching how extract.rs already conditionally wires them. This drops the allow(dead_code) workaround and should trim default compile work.

A pr_description.md file documents the motivation and verification steps (clippy with/without the feature, in-cli tests).

^{Reviewed by Cursor Bugbot for commit 663d85d. Configure here.}

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