refactor: retire sandbox dual-write; file tools write in-place into workspace

infrastructure/tools/src/main/kotlin/com/correx/infrastructure/tools/ToolConfig.kt

@@ -1,7 +1,5 @@
 package com.correx.infrastructure.tools
 
-import com.correx.core.artifacts.MaterializingArtifactWriter
-import com.correx.core.artifactstore.ArtifactStore
 import com.correx.core.tools.contract.Tool
 import com.correx.infrastructure.tools.filesystem.FileEditTool
 import com.correx.infrastructure.tools.filesystem.FileReadTool
@@ -20,9 +18,6 @@ data class FileReadConfig(val enabled: Boolean = false, val allowedPaths: Set<Pa
 data class FileWriteConfig(
     val enabled: Boolean = false,
     val allowedPaths: Set<Path> = emptySet(),
-    val artifactStore: ArtifactStore? = null,
-    val materializingWriter: MaterializingArtifactWriter? = null,
-    val sandboxRoot: Path? = null,
     val workingDir: Path? = null,
 )
 
@@ -61,9 +56,6 @@ fun ToolConfig.buildTools(): List<Tool> = buildList {
         add(
             FileWriteTool(
                 allowedPaths = fileWrite.allowedPaths,
-                artifactStore = fileWrite.artifactStore,
-                materializingWriter = fileWrite.materializingWriter,
-                sandboxRoot = fileWrite.sandboxRoot,
                 workingDir = fileWrite.workingDir,
             ),
         )