feat(native): port Solidity extractor to Rust (#1100)

* feat(native): port Solidity extractor to Rust

Adds tree-sitter-solidity dependency and native extractor matching
the WASM-side behavior for Solidity symbol, import, and call extraction.

Part of #1071

* fix(extractors): emit class relation for every Solidity parent

`extract_inheritance` / `extractInheritance` previously called
`find_child(node, 'inheritance_specifier')` and stopped at the first
match, but the tree-sitter-solidity grammar models each parent in
`contract A is B, C, D { }` as a separate `inheritance_specifier`
sibling under the contract node (`_class_heritage: "is"
commaSep1($.inheritance_specifier)`). All parents past the first were
silently dropped on both the native and WASM paths.

Walk every direct child of the contract node and emit a ClassRelation
for each parent on both engines, and add multi-parent unit tests in
Rust and TypeScript to lock the behaviour in.

* fix: update native-drop test for cu still unsupported (#1100)

Author: carlos-alm

Cargo.lock

@@ -38,6 +38,7 @@ tree-sitter-haskell = "0.23"
 tree-sitter-ocaml = "0.24"
 tree-sitter-julia = "0.23"
 tree-sitter-clojure-orchard = "0.2"
+tree-sitter-solidity = "1.2"
 rayon = "1"
 ignore = "0.4"
 globset = "0.4"

crates/codegraph-core/Cargo.toml

@@ -394,6 +394,16 @@ pub const CLOJURE_AST_CONFIG: LangAstConfig = LangAstConfig {
     string_prefixes: &[],
 };
 
+pub const SOLIDITY_AST_CONFIG: LangAstConfig = LangAstConfig {
+    new_types: &["new_expression"],
+    throw_types: &["revert_statement"],
+    await_types: &[],
+    string_types: &["string_literal", "hex_string_literal", "unicode_string_literal"],
+    regex_types: &[],
+    quote_chars: &['"', '\''],
+    string_prefixes: &[],
+};
+
 // ── Generic AST node walker ──────────────────────────────────────────────────
 
 /// Node types that represent identifiers across languages.

crates/codegraph-core/src/extractors/helpers.rs

@@ -21,6 +21,7 @@ pub mod python;
 pub mod ruby;
 pub mod rust_lang;
 pub mod scala;
+pub mod solidity;
 pub mod swift;
 pub mod zig;
 
@@ -138,5 +139,8 @@ pub fn extract_symbols_with_opts(
         LanguageKind::Clojure => {
             clojure::ClojureExtractor.extract_with_opts(tree, source, file_path, include_ast_nodes)
         }
+        LanguageKind::Solidity => {
+            solidity::SolidityExtractor.extract_with_opts(tree, source, file_path, include_ast_nodes)
+        }
     }
 }