diff --git a/core/fixtures/entity_store.json b/core/fixtures/entity_store.json
index 3a828ea2f..5f30b40f1 100644
--- a/core/fixtures/entity_store.json
+++ b/core/fixtures/entity_store.json
@@ -1,6 +1,6 @@
 {
   "artifacts": {
-    "entities/ambiguities.jsonl": "{\"schema_version\": 1, \"ambiguity_id\": \"amb_04374a01e8579a661fb1d1aa\", \"scope\": {\"kind\": \"journal\"}, \"normalized_query\": \"alice\", \"original_query\": \"Alice\", \"latest_query\": \"Alice\", \"first_seen\": \"2026-08-04T00:00:00Z\", \"last_seen\": \"2026-08-04T00:00:00Z\", \"observed_tier\": 5, \"occurrence_count\": 1, \"status\": \"open\", \"ranked_candidates\": [{\"id\": \"alice_chen\", \"name\": \"Alice Chen\", \"tier\": 5, \"score\": 92.3076923076923}, {\"id\": \"alice_chan\", \"name\": \"Alice Chan\", \"tier\": 5, \"score\": 90.0}], \"origins\": [{\"lane\": \"segment\", \"day\": \"20260804\", \"segment_id\": \"s1\"}], \"origin_keys\": [\"{\\\"day\\\":\\\"20260804\\\",\\\"lane\\\":\\\"segment\\\",\\\"segment_id\\\":\\\"s1\\\"}\"], \"audit\": {\"prior_choices\": []}}\n{\"schema_version\": 1, \"ambiguity_id\": \"amb_7ffaa5cbbfc8319f825215a2\", \"scope\": {\"kind\": \"facet\", \"facet\": \"work\"}, \"normalized_query\": \"strasse\", \"original_query\": \"Stra\u00dfe\", \"latest_query\": \"Stra\u00dfe\", \"first_seen\": \"2026-08-04T00:00:00Z\", \"last_seen\": \"2026-08-04T00:00:00Z\", \"observed_tier\": 8, \"occurrence_count\": 1, \"status\": \"resolved\", \"ranked_candidates\": [{\"id\": \"alice_chen\", \"name\": \"Alice Chen\", \"tier\": 8, \"score\": 92.3076923076923}, {\"id\": \"alice_chan\", \"name\": \"Alice Chan\", \"tier\": 8, \"score\": 90.0}], \"origins\": [{\"lane\": \"import\", \"source_id\": \"kindle\", \"field\": \"author\"}], \"origin_keys\": [\"{\\\"field\\\":\\\"author\\\",\\\"lane\\\":\\\"import\\\",\\\"source_id\\\":\\\"kindle\\\"}\"], \"audit\": {\"prior_choices\": []}, \"resolved_entity_id\": \"strasse_handels_gmbh\", \"resolved_at\": \"2026-08-04T00:00:00Z\"}\n",
+    "entities/ambiguities.jsonl": "{\"schema_version\": 1, \"ambiguity_id\": \"amb_04374a01e8579a661fb1d1aa\", \"scope\": {\"kind\": \"journal\"}, \"normalized_query\": \"alice\", \"original_query\": \"Alice\", \"latest_query\": \"Alice\", \"first_seen\": \"2026-08-04T00:00:00Z\", \"last_seen\": \"2026-08-04T00:00:00Z\", \"observed_tier\": 5, \"occurrence_count\": 1, \"status\": \"open\", \"ranked_candidates\": [{\"id\": \"alice_chen\", \"name\": \"Alice Chen\", \"tier\": 5, \"score\": 92.3076923076923}, {\"id\": \"alice_chan\", \"name\": \"Alice Chan\", \"tier\": 5, \"score\": 90.0}], \"origins\": [{\"lane\": \"segment\", \"day\": \"20260804\", \"segment_id\": \"s1\"}], \"origin_keys\": [\"{\\\"day\\\":\\\"20260804\\\",\\\"lane\\\":\\\"segment\\\",\\\"segment_id\\\":\\\"s1\\\"}\"], \"audit\": {\"prior_choices\": []}}\n{\"schema_version\": 1, \"ambiguity_id\": \"amb_7ffaa5cbbfc8319f825215a2\", \"scope\": {\"kind\": \"facet\", \"facet\": \"work\"}, \"normalized_query\": \"strasse\", \"original_query\": \"Stra\u00dfe\", \"latest_query\": \"Stra\u00dfe\", \"first_seen\": \"2026-08-04T00:00:00Z\", \"last_seen\": \"2026-08-04T00:00:00Z\", \"observed_tier\": 8, \"occurrence_count\": 1, \"status\": \"resolved\", \"ranked_candidates\": [{\"id\": \"alice_chen\", \"name\": \"Alice Chen\", \"tier\": 8, \"score\": 92.3076923076923}, {\"id\": \"alice_chan\", \"name\": \"Alice Chan\", \"tier\": 8, \"score\": 90.0}], \"origins\": [{\"lane\": \"import\", \"source_id\": \"Stra\u00dfe Verlag\", \"field\": \"author\"}], \"origin_keys\": [\"{\\\"field\\\":\\\"author\\\",\\\"lane\\\":\\\"import\\\",\\\"source_id\\\":\\\"Stra\\\\u00dfe Verlag\\\"}\"], \"audit\": {\"prior_choices\": []}, \"resolved_entity_id\": \"strasse_handels_gmbh\", \"resolved_at\": \"2026-08-04T00:00:00Z\"}\n",
     "entities/{id}/entity.json": "{\n  \"id\": \"alice_johnson\",\n  \"name\": \"Alice Johnson\",\n  \"type\": \"Person\",\n  \"created_at\": 1785889922582,\n  \"aka\": [\n    \"Ali\",\n    \"AJ\"\n  ],\n  \"emails\": [\n    \"alice@example.com\"\n  ]\n}\n",
     "entities/{id}/entity.json (unicode)": "{\n  \"id\": \"jose_garcia\",\n  \"name\": \"Jos\u00e9 Garc\u00eda\",\n  \"type\": \"Person\",\n  \"created_at\": 1785889922583,\n  \"description\": \"raw UTF-8 on disk, never \\\\u escapes\"\n}\n",
     "entities/{id}/history/events/{seq}-{version_id}.json": "{\n  \"actor\": null,\n  \"caller\": null,\n  \"entity_id\": \"alice_johnson\",\n  \"identity_after\": {\n    \"aka\": [\n      \"Ali\",\n      \"AJ\"\n    ],\n    \"created_at\": 1785889922582,\n    \"emails\": [\n      \"alice@example.com\"\n    ],\n    \"id\": \"alice_johnson\",\n    \"name\": \"Alice Johnson\",\n    \"type\": \"Person\"\n  },\n  \"identity_before\": null,\n  \"kind\": \"create\",\n  \"operation\": {},\n  \"schema_version\": 1,\n  \"seq\": 1,\n  \"ts\": \"2026-08-05T00:32:02.582506Z\",\n  \"version_id\": \"vh_49d7adcbf786461cb11c00081afa9780\"\n}\n"
@@ -315,14 +315,14 @@
         "observed_tier": 8,
         "occurrence_count": 1,
         "origin_keys": [
-          "{\"field\":\"author\",\"lane\":\"import\",\"source_id\":\"kindle\"}"
+          "{\"field\":\"author\",\"lane\":\"import\",\"source_id\":\"Stra\\u00dfe Verlag\"}"
         ],
         "original_query": "Stra\u00dfe",
         "origins": [
           {
             "field": "author",
             "lane": "import",
-            "source_id": "kindle"
+            "source_id": "Stra\u00dfe Verlag"
           }
         ],
         "ranked_candidates": [
@@ -395,6 +395,7 @@
       "type": "Person"
     }
   },
+  "inputs_note": "\u26a0 These are the VALUES that produced the artifacts, and their key order is NOT the artifacts' key order \u2014 this whole file is serialised with sorted keys, which normalises it away. The identity file and the ambiguity rows preserve INSERTION order on disk, so re-serialising an input from here yields alphabetical keys and will not match the artifact bytes. \u26d4 Do not read that as a corpus defect. For a byte comparison the ARTIFACT is its own oracle: parse it order-preservingly, re-serialise, compare. These inputs are for semantic assertions.",
   "negative": {
     "ambiguity_rows": [
       {
diff --git a/scripts/entity_corpus.py b/scripts/entity_corpus.py
index fba54b756..6347355a9 100644
--- a/scripts/entity_corpus.py
+++ b/scripts/entity_corpus.py
@@ -765,7 +765,14 @@ def _ambiguity_rows() -> list[dict[str, Any]]:
             ResolutionScope.facet_scope("work"),
             "Straße",
             8,
-            ResolutionOrigin(lane="import", source_id="kindle", field="author"),
+            # 🔴 Non-ASCII on purpose. The origin KEY is serialised with
+            # ensure_ascii left on, so it carries \uXXXX escapes, while the
+            # surrounding row is raw UTF-8. Two encodings, one row. With only
+            # ASCII origins the difference is invisible, and getting it wrong
+            # duplicates an origin instead of matching it -- silently, and
+            # without ever tripping the same-length rule, because a duplicate
+            # appends to both lists.
+            ResolutionOrigin(lane="import", source_id="Straße Verlag", field="author"),
             "strasse_handels_gmbh",
         ),
     )
@@ -1188,6 +1195,17 @@ def build_entity_store_fixture() -> dict[str, Any]:
             "entities/{id}/history/events/{seq}-{version_id}.json": event_bytes,
             "entities/ambiguities.jsonl": ambiguities_bytes,
         },
+        "inputs_note": (
+            "⚠ These are the VALUES that produced the artifacts, and their key "
+            "order is NOT the artifacts' key order — this whole file is "
+            "serialised with sorted keys, which normalises it away. The "
+            "identity file and the ambiguity rows preserve INSERTION order on "
+            "disk, so re-serialising an input from here yields alphabetical "
+            "keys and will not match the artifact bytes. ⛔ Do not read that as "
+            "a corpus defect. For a byte comparison the ARTIFACT is its own "
+            "oracle: parse it order-preservingly, re-serialise, compare. These "
+            "inputs are for semantic assertions."
+        ),
         "inputs": {
             "identity": _ENTITY_FIXED,
             "identity_unicode": _ENTITY_UNICODE,