Update CODEOWNERS

Author: mshinwell

.github/CODEOWNERS

@@ -33,19 +33,25 @@ file_formats/                   @mshinwell
 middle_end/                     @mshinwell
 
 middle_end/flambda2/                    @mshinwell @lthls
-middle_end/flambda2/backend_intf        @mshinwell @lthls
-middle_end/flambda2/basic               @mshinwell @lthls
+middle_end/flambda2/algorithms          @gbury @chambart
+middle_end/flambda2/bound_identifiers   @mshinwell @lthls
 middle_end/flambda2/cmx                 @lthls @mshinwell
-middle_end/flambda2/compilenv_deps      @mshinwell @gbury
 middle_end/flambda2/from_lambda         @lthls @mshinwell
-middle_end/flambda2/inlining            @poechsel @lukemaurer
-middle_end/flambda2/lifting             @mshinwell @chambart
+middle_end/flambda2/identifiers         @mshinwell @lthls
+middle_end/flambda2/kinds               @mshinwell @lthls
+middle_end/flambda2/lattices            @mshinwell @lthls
 middle_end/flambda2/nominal             @mshinwell @lthls
+middle_end/flambda2/numbers             @mshinwell @gbury
 middle_end/flambda2/simplify            @mshinwell @gbury
+middle_end/flambda2/simplify/env        @mshinwell @gbury
+middle_end/flambda2/simplify/inlining   @poechsel @lukemaurer
+middle_end/flambda2/simplify/lifting    @mshinwell @chambart
+middle_end/flambda2/simplify/unboxing   @chambart @gbury
+middle_end/flambda2/term_basics         @mshinwell @lthls
 middle_end/flambda2/terms               @mshinwell @lthls
 middle_end/flambda2/to_cmm              @gbury @lthls
 middle_end/flambda2/types               @lthls @chambart
-middle_end/flambda2/unboxing            @chambart @gbury
+middle_end/flambda2/ui                  @mshinwell @poechsel
 
 middle_end/flambda2/compare             @lukemaurer
 middle_end/flambda2/parser              @lukemaurer