Revert "perf(build): speed up local CLI rebuilds (#1387)" (#1395)

This reverts commit 668c712b63.

scripts/bin/openshell

@@ -115,11 +115,7 @@ if [[ "$needs_build" == "1" ]]; then
       build_args+=(--features bundled-z3)
     fi
   fi
-  if [[ "${OPENSHELL_CLI_USE_SCCACHE:-}" == "1" ]]; then
-    cargo build "${build_args[@]}"
-  else
-    env -u RUSTC_WRAPPER cargo build "${build_args[@]}"
-  fi
+  cargo build "${build_args[@]}"
   # Persist state after successful build
   mkdir -p "$(dirname "$STATE_FILE")"
   cd "$PROJECT_ROOT"