refactor(backend): retire unused native bridge entry points

rust_backend/crates/extensions/src/environment/index.rs

@@ -1,5 +1,5 @@
 use super::{EnvironmentError, ExtensionEnvironment};
-use spotiflac_core::isrc::{IndexCache, IndexFiles, NativeFiles, parse_tracks};
+use spotiflac_core::isrc::{IndexCache, NativeFiles};
 use std::sync::atomic::Ordering;
 
 type Check<'a> = &'a (dyn Fn() -> Result<(), String> + Sync);
@@ -27,27 +27,6 @@ impl ExtensionEnvironment {
 
     /// Trusted native entry points share the SDK's index, while JavaScript uses
     /// a scoped IndexFiles adapter and revalidates native directory grants.
-    pub fn prebuild_isrc_index(
-        &self,
-        directory: &str,
-        check: Check<'_>,
-    ) -> Result<(), EnvironmentError> {
-        self.with_index(check, |cache, files, check| {
-            cache.prebuild(directory, files, check)
-        })
-    }
-
-    pub fn check_isrc_exists(
-        &self,
-        directory: &str,
-        isrc: &str,
-        check: Check<'_>,
-    ) -> Result<String, EnvironmentError> {
-        self.with_index(check, |cache, files, check| {
-            cache.check(directory, isrc, files, check)
-        })
-    }
-
     pub fn add_to_isrc_index(
         &self,
         directory: &str,
@@ -60,33 +39,9 @@ impl ExtensionEnvironment {
         })
     }
 
-    pub fn check_files_exist_parallel(
-        &self,
-        directory: &str,
-        tracks_json: &str,
-        check: Check<'_>,
-    ) -> Result<String, EnvironmentError> {
-        self.with_index(check, |cache, files, check| {
-            if tracks_json.len() > 8 * 1024 * 1024 {
-                return Err("tracks JSON exceeds 8 MiB limit".into());
-            }
-            let tracks = parse_tracks(tracks_json)?;
-            let results = cache.check_batch(directory, &tracks, files, check)?;
-            serde_json::to_string(&results).map_err(|error| error.to_string())
-        })
-    }
-
     pub fn invalidate_isrc_cache(&self, directory: &str) -> Result<(), EnvironmentError> {
         let _operation = self.enter()?;
         self.isrc.invalidate(directory);
         Ok(())
     }
-
-    pub fn check_file_exists(&self, path: &str) -> Result<bool, EnvironmentError> {
-        let _operation = self.enter()?;
-        NativeFiles
-            .stat(path)
-            .map(|stamp| stamp.is_some_and(|stamp| !stamp.directory && stamp.size > 0))
-            .map_err(EnvironmentError::Index)
-    }
 }