diff --git a/shared/i18n/artifacts/lobby-mvp-keyspace-parity-report.v1.json b/shared/i18n/artifacts/lobby-mvp-keyspace-parity-report.v1.json
index 503bb44..7ad6e7f 100644
--- a/shared/i18n/artifacts/lobby-mvp-keyspace-parity-report.v1.json
+++ b/shared/i18n/artifacts/lobby-mvp-keyspace-parity-report.v1.json
@@ -4,7 +4,7 @@
   "naming_version_rule": "Keep a stable artifact_name and append only explicit schema-major suffixes to the filename/version (v1, v2, ...). Update artifact_version only when the report shape changes; refresh content in-place for catalog/keyspace changes.",
   "source_of_truth": {
     "catalog": "shared/i18n/lobby.json",
-    "catalog_sha256": "e3ed39f2fa25622c01b450bd14fd4da5fc7f96c0d9635bb819f73cae14203beb",
+    "catalog_sha256": "d9f7227bddd007f2c56f33dfd0015bcffb3b60c52dc756126a02b7e4de638adb",
     "source_paths": [
       "lobby/views.py",
       "frontend/src/spa/vertical-slice.ts",
@@ -24,28 +24,7 @@
   },
   "parity": {
     "status": "pass",
-    "django_backend_error_codes_used_by_mvp": [
-      "category_has_no_questions",
-      "category_not_found",
-      "category_slug_required",
-      "host_only_mix_answers",
-      "host_only_show_question",
-      "host_only_start_round",
-      "mix_answers_invalid_phase",
-      "nickname_invalid",
-      "nickname_taken",
-      "no_available_questions",
-      "not_enough_answers_to_mix",
-      "question_already_shown",
-      "round_already_configured",
-      "round_config_missing",
-      "round_question_not_found",
-      "round_start_invalid_phase",
-      "session_code_required",
-      "session_not_found",
-      "session_not_joinable",
-      "show_question_invalid_phase"
-    ],
+    "django_backend_error_codes_used_by_mvp": [],
     "angular_frontend_error_fallback_keys_used_by_mvp": [
       "join_failed",
       "session_code_required",
@@ -158,36 +137,8 @@
       "player.submit_lie",
       "player.title"
     ],
-    "backend_codes_mapped_to_frontend_error_keys": {
-      "category_has_no_questions": "start_round_failed",
-      "category_not_found": "start_round_failed",
-      "category_slug_required": "start_round_failed",
-      "host_only_mix_answers": "start_round_failed",
-      "host_only_show_question": "start_round_failed",
-      "host_only_start_round": "start_round_failed",
-      "mix_answers_invalid_phase": "start_round_failed",
-      "nickname_invalid": "nickname_invalid",
-      "nickname_taken": "nickname_taken",
-      "no_available_questions": "start_round_failed",
-      "not_enough_answers_to_mix": "start_round_failed",
-      "question_already_shown": "start_round_failed",
-      "round_already_configured": "start_round_failed",
-      "round_config_missing": "start_round_failed",
-      "round_question_not_found": "start_round_failed",
-      "round_start_invalid_phase": "start_round_failed",
-      "session_code_required": "session_code_required",
-      "session_not_found": "session_not_found",
-      "session_not_joinable": "join_failed",
-      "show_question_invalid_phase": "start_round_failed"
-    },
-    "unique_frontend_error_keys_reached_from_django": [
-      "join_failed",
-      "nickname_invalid",
-      "nickname_taken",
-      "session_code_required",
-      "session_not_found",
-      "start_round_failed"
-    ],
+    "backend_codes_mapped_to_frontend_error_keys": {},
+    "unique_frontend_error_keys_reached_from_django": [],
     "blocking_issues": {
       "missing_backend_codes": [],
       "missing_backend_translations": [],
@@ -201,11 +152,6 @@
         "priority": "need-to-have",
         "item": "Either add missing backend/error_codes + backend/errors entries for dead contract aliases or remove them from contract.backend_to_frontend_error_keys.",
         "evidence": "host_only_action"
-      },
-      {
-        "priority": "nice-to-have",
-        "item": "Decide whether grouped backend codes should keep collapsing into one Angular fallback key or be split into more specific frontend error copy as UX matures.",
-        "evidence": "start_round_failed <= category_has_no_questions, category_not_found, category_slug_required, host_only_mix_answers, host_only_show_question, host_only_start_round, mix_answers_invalid_phase, no_available_questions, not_enough_answers_to_mix, question_already_shown, round_already_configured, round_config_missing, round_question_not_found, round_start_invalid_phase, show_question_invalid_phase"
       }
     ]
   }