diff --git a/AGENTS.md b/AGENTS.md
index c97defa6..aa426a1b 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -100,10 +100,10 @@ What you need to know right now is that `gen/cpp` is where our MusicXML types ar
 
 ## Quality gates
 
-Run `make fmt` for a stable version of clang format.
-Run `make check` to see if you will pass in CI
-Run `make test-core-dev` to run the `corert` tests, especially if you are working in `mx/core`.
-Run `make test` to run all the tests. (Slow and heavy on the local machine)
+Run `make fmt` to format. `make check` is the clang-format gate **only** — it builds and tests nothing.
+Run `make test-core-dev` for corert (especially `mx/core` work); `make test` for everything (slow).
+Adding/removing a `data/` file: bump the pinned count in `CoreRoundtripTest.cpp`, run `make audit` (regenerates `corpus.xml` + `*.features.xml`), confirm round-trip via `make test-core-dev`.
+`ApiLoadSmokeTest` proves a file imports without crashing, not that the data is correct; the read→write→read gate (`make test-api-roundtrip` / `roundtrip-baseline.txt`) is the correctness check — pin a fixture there to defend a feature.
 
 Look at what will run in CI `.github/workflows/ci.yaml` and anticipate issues there when coding
 locally.
diff --git a/data/corpus.xml b/data/corpus.xml
index eaf20179..26fe6372 100644
--- a/data/corpus.xml
+++ b/data/corpus.xml
@@ -4,21 +4,23 @@
      usage (descending). Do not edit by hand; regenerate with the tool. -->
 <corpus-features>
   <summary>
-    <files total="829" wild="440" synthetic="389"/>
+    <files total="831" wild="442" synthetic="389"/>
     <elements total="442" used-in-wild="326" synthetic-only="116"/>
   </summary>
   <elements>
-    <element name="measure" total-files="829" wild-files="440" synthetic-files="389" min-synthetic-version="3.0">
+    <element name="measure" total-files="831" wild-files="442" synthetic-files="389" min-synthetic-version="3.0">
       <attributes>
-        <attribute name="number" wild-files="440" synthetic-files="389"/>
+        <attribute name="number" wild-files="442" synthetic-files="389"/>
         <attribute name="width" wild-files="152" synthetic-files="2"/>
         <attribute name="implicit" wild-files="24" synthetic-files="2"/>
         <attribute name="id" wild-files="0" synthetic-files="1"/>
         <attribute name="non-controlling" wild-files="0" synthetic-files="2"/>
         <attribute name="text" wild-files="0" synthetic-files="1"/>
       </attributes>
-      <wild-files count="440">
+      <wild-files count="442">
         <file>custom/musescore-slur-start-stop.musicxml</file>
+        <file>custom/segno_coda_roundtrip.3.0.xml</file>
+        <file>custom/segno_coda_roundtrip.3.1.xml</file>
         <file>custom/systems-and-pages.xml</file>
         <file>custom/transposition.musicxml</file>
         <file>foundsuite/12 Horn Duets.xml</file>
@@ -28,9 +30,7 @@
         <file>foundsuite/Berlioz_Le_Corsaire.xml</file>
         <file>foundsuite/Black Note Study Op 10 no 5.xml</file>
         <file>foundsuite/Deutscher Tanz D.820.1.xml</file>
-        <file>foundsuite/Invention 1.xml</file>
-        <file>foundsuite/Invention 2.xml</file>
-        <!-- 428 more -->
+        <!-- 430 more -->
       </wild-files>
       <synthetic-files count="389" min-version="3.0">
         <file version="3.0">synthetic/accent.3.0.xml</file>
@@ -424,12 +424,14 @@
         <file version="3.0">synthetic/work-title.3.0.xml</file>
       </synthetic-files>
     </element>
-    <element name="part" total-files="829" wild-files="440" synthetic-files="389" min-synthetic-version="3.0">
+    <element name="part" total-files="831" wild-files="442" synthetic-files="389" min-synthetic-version="3.0">
       <attributes>
-        <attribute name="id" wild-files="440" synthetic-files="389"/>
+        <attribute name="id" wild-files="442" synthetic-files="389"/>
       </attributes>
-      <wild-files count="440">
+      <wild-files count="442">
         <file>custom/musescore-slur-start-stop.musicxml</file>
+        <file>custom/segno_coda_roundtrip.3.0.xml</file>
+        <file>custom/segno_coda_roundtrip.3.1.xml</file>
         <file>custom/systems-and-pages.xml</file>
         <file>custom/transposition.musicxml</file>
         <file>foundsuite/12 Horn Duets.xml</file>
@@ -439,9 +441,7 @@
         <file>foundsuite/Berlioz_Le_Corsaire.xml</file>
         <file>foundsuite/Black Note Study Op 10 no 5.xml</file>
         <file>foundsuite/Deutscher Tanz D.820.1.xml</file>
-        <file>foundsuite/Invention 1.xml</file>
-        <file>foundsuite/Invention 2.xml</file>
-        <!-- 428 more -->
+        <!-- 430 more -->
       </wild-files>
       <synthetic-files count="389" min-version="3.0">
         <file version="3.0">synthetic/accent.3.0.xml</file>
@@ -835,9 +835,11 @@
         <file version="3.0">synthetic/work-title.3.0.xml</file>
       </synthetic-files>
     </element>
-    <element name="part-list" total-files="829" wild-files="440" synthetic-files="389" min-synthetic-version="3.0">
-      <wild-files count="440">
+    <element name="part-list" total-files="831" wild-files="442" synthetic-files="389" min-synthetic-version="3.0">
+      <wild-files count="442">
         <file>custom/musescore-slur-start-stop.musicxml</file>
+        <file>custom/segno_coda_roundtrip.3.0.xml</file>
+        <file>custom/segno_coda_roundtrip.3.1.xml</file>
         <file>custom/systems-and-pages.xml</file>
         <file>custom/transposition.musicxml</file>
         <file>foundsuite/12 Horn Duets.xml</file>
@@ -847,9 +849,7 @@
         <file>foundsuite/Berlioz_Le_Corsaire.xml</file>
         <file>foundsuite/Black Note Study Op 10 no 5.xml</file>
         <file>foundsuite/Deutscher Tanz D.820.1.xml</file>
-        <file>foundsuite/Invention 1.xml</file>
-        <file>foundsuite/Invention 2.xml</file>
-        <!-- 428 more -->
+        <!-- 430 more -->
       </wild-files>
       <synthetic-files count="389" min-version="3.0">
         <file version="3.0">synthetic/accent.3.0.xml</file>
@@ -1243,7 +1243,7 @@
         <file version="3.0">synthetic/work-title.3.0.xml</file>
       </synthetic-files>
     </element>
-    <element name="part-name" total-files="829" wild-files="440" synthetic-files="389" min-synthetic-version="3.0">
+    <element name="part-name" total-files="831" wild-files="442" synthetic-files="389" min-synthetic-version="3.0">
       <attributes>
         <attribute name="print-object" wild-files="36" synthetic-files="1"/>
         <attribute name="color" wild-files="1" synthetic-files="1"/>
@@ -1257,8 +1257,10 @@
         <attribute name="relative-x" wild-files="0" synthetic-files="1"/>
         <attribute name="relative-y" wild-files="0" synthetic-files="1"/>
       </attributes>
-      <wild-files count="440">
+      <wild-files count="442">
         <file>custom/musescore-slur-start-stop.musicxml</file>
+        <file>custom/segno_coda_roundtrip.3.0.xml</file>
+        <file>custom/segno_coda_roundtrip.3.1.xml</file>
         <file>custom/systems-and-pages.xml</file>
         <file>custom/transposition.musicxml</file>
         <file>foundsuite/12 Horn Duets.xml</file>
@@ -1268,9 +1270,7 @@
         <file>foundsuite/Berlioz_Le_Corsaire.xml</file>
         <file>foundsuite/Black Note Study Op 10 no 5.xml</file>
         <file>foundsuite/Deutscher Tanz D.820.1.xml</file>
-        <file>foundsuite/Invention 1.xml</file>
-        <file>foundsuite/Invention 2.xml</file>
-        <!-- 428 more -->
+        <!-- 430 more -->
       </wild-files>
       <synthetic-files count="389" min-version="3.0">
         <file version="3.0">synthetic/accent.3.0.xml</file>
@@ -1664,12 +1664,14 @@
         <file version="3.0">synthetic/work-title.3.0.xml</file>
       </synthetic-files>
     </element>
-    <element name="score-part" total-files="829" wild-files="440" synthetic-files="389" min-synthetic-version="3.0">
+    <element name="score-part" total-files="831" wild-files="442" synthetic-files="389" min-synthetic-version="3.0">
       <attributes>
-        <attribute name="id" wild-files="440" synthetic-files="389"/>
+        <attribute name="id" wild-files="442" synthetic-files="389"/>
       </attributes>
-      <wild-files count="440">
+      <wild-files count="442">
         <file>custom/musescore-slur-start-stop.musicxml</file>
+        <file>custom/segno_coda_roundtrip.3.0.xml</file>
+        <file>custom/segno_coda_roundtrip.3.1.xml</file>
         <file>custom/systems-and-pages.xml</file>
         <file>custom/transposition.musicxml</file>
         <file>foundsuite/12 Horn Duets.xml</file>
@@ -1679,9 +1681,7 @@
         <file>foundsuite/Berlioz_Le_Corsaire.xml</file>
         <file>foundsuite/Black Note Study Op 10 no 5.xml</file>
         <file>foundsuite/Deutscher Tanz D.820.1.xml</file>
-        <file>foundsuite/Invention 1.xml</file>
-        <file>foundsuite/Invention 2.xml</file>
-        <!-- 428 more -->
+        <!-- 430 more -->
       </wild-files>
       <synthetic-files count="389" min-version="3.0">
         <file version="3.0">synthetic/accent.3.0.xml</file>
@@ -2075,12 +2075,14 @@
         <file version="3.0">synthetic/work-title.3.0.xml</file>
       </synthetic-files>
     </element>
-    <element name="score-partwise" total-files="826" wild-files="437" synthetic-files="389" min-synthetic-version="3.0">
+    <element name="score-partwise" total-files="828" wild-files="439" synthetic-files="389" min-synthetic-version="3.0">
       <attributes>
-        <attribute name="version" wild-files="163" synthetic-files="389"/>
+        <attribute name="version" wild-files="165" synthetic-files="389"/>
       </attributes>
-      <wild-files count="437">
+      <wild-files count="439">
         <file>custom/musescore-slur-start-stop.musicxml</file>
+        <file>custom/segno_coda_roundtrip.3.0.xml</file>
+        <file>custom/segno_coda_roundtrip.3.1.xml</file>
         <file>custom/systems-and-pages.xml</file>
         <file>custom/transposition.musicxml</file>
         <file>foundsuite/12 Horn Duets.xml</file>
@@ -2090,9 +2092,7 @@
         <file>foundsuite/Berlioz_Le_Corsaire.xml</file>
         <file>foundsuite/Black Note Study Op 10 no 5.xml</file>
         <file>foundsuite/Deutscher Tanz D.820.1.xml</file>
-        <file>foundsuite/Invention 1.xml</file>
-        <file>foundsuite/Invention 2.xml</file>
-        <!-- 425 more -->
+        <!-- 427 more -->
       </wild-files>
       <synthetic-files count="389" min-version="3.0">
         <file version="3.0">synthetic/accent.3.0.xml</file>
@@ -2486,9 +2486,11 @@
         <file version="3.0">synthetic/work-title.3.0.xml</file>
       </synthetic-files>
     </element>
-    <element name="duration" total-files="444" wild-files="435" synthetic-files="9" min-synthetic-version="3.0">
-      <wild-files count="435">
+    <element name="duration" total-files="446" wild-files="437" synthetic-files="9" min-synthetic-version="3.0">
+      <wild-files count="437">
         <file>custom/musescore-slur-start-stop.musicxml</file>
+        <file>custom/segno_coda_roundtrip.3.0.xml</file>
+        <file>custom/segno_coda_roundtrip.3.1.xml</file>
         <file>custom/systems-and-pages.xml</file>
         <file>custom/transposition.musicxml</file>
         <file>foundsuite/12 Horn Duets.xml</file>
@@ -2498,9 +2500,7 @@
         <file>foundsuite/Berlioz_Le_Corsaire.xml</file>
         <file>foundsuite/Black Note Study Op 10 no 5.xml</file>
         <file>foundsuite/Deutscher Tanz D.820.1.xml</file>
-        <file>foundsuite/Invention 1.xml</file>
-        <file>foundsuite/Invention 2.xml</file>
-        <!-- 423 more -->
+        <!-- 425 more -->
       </wild-files>
       <synthetic-files count="9" min-version="3.0">
         <file version="3.0">synthetic/cancel.location.3.0.xml</file>
@@ -2514,9 +2514,11 @@
         <file version="3.0">synthetic/suffix.3.0.xml</file>
       </synthetic-files>
     </element>
-    <element name="attributes" total-files="469" wild-files="433" synthetic-files="36" min-synthetic-version="3.0">
-      <wild-files count="433">
+    <element name="attributes" total-files="471" wild-files="435" synthetic-files="36" min-synthetic-version="3.0">
+      <wild-files count="435">
         <file>custom/musescore-slur-start-stop.musicxml</file>
+        <file>custom/segno_coda_roundtrip.3.0.xml</file>
+        <file>custom/segno_coda_roundtrip.3.1.xml</file>
         <file>custom/systems-and-pages.xml</file>
         <file>custom/transposition.musicxml</file>
         <file>foundsuite/12 Horn Duets.xml</file>
@@ -2526,9 +2528,7 @@
         <file>foundsuite/Berlioz_Le_Corsaire.xml</file>
         <file>foundsuite/Black Note Study Op 10 no 5.xml</file>
         <file>foundsuite/Deutscher Tanz D.820.1.xml</file>
-        <file>foundsuite/Invention 1.xml</file>
-        <file>foundsuite/Invention 2.xml</file>
-        <!-- 421 more -->
+        <!-- 423 more -->
       </wild-files>
       <synthetic-files count="36" min-version="3.0">
         <file version="3.0">synthetic/beat-repeat.3.0.xml</file>
@@ -2569,9 +2569,11 @@
         <file version="3.1">synthetic/transpose.3.1.xml</file>
       </synthetic-files>
     </element>
-    <element name="divisions" total-files="436" wild-files="433" synthetic-files="3" min-synthetic-version="3.0">
-      <wild-files count="433">
+    <element name="divisions" total-files="438" wild-files="435" synthetic-files="3" min-synthetic-version="3.0">
+      <wild-files count="435">
         <file>custom/musescore-slur-start-stop.musicxml</file>
+        <file>custom/segno_coda_roundtrip.3.0.xml</file>
+        <file>custom/segno_coda_roundtrip.3.1.xml</file>
         <file>custom/systems-and-pages.xml</file>
         <file>custom/transposition.musicxml</file>
         <file>foundsuite/12 Horn Duets.xml</file>
@@ -2581,9 +2583,7 @@
         <file>foundsuite/Berlioz_Le_Corsaire.xml</file>
         <file>foundsuite/Black Note Study Op 10 no 5.xml</file>
         <file>foundsuite/Deutscher Tanz D.820.1.xml</file>
-        <file>foundsuite/Invention 1.xml</file>
-        <file>foundsuite/Invention 2.xml</file>
-        <!-- 421 more -->
+        <!-- 423 more -->
       </wild-files>
       <synthetic-files count="3" min-version="3.0">
         <file version="3.0">synthetic/cancel.location.3.0.xml</file>
@@ -2591,7 +2591,7 @@
         <file version="3.1">synthetic/key-accidental.smufl.3.1.xml</file>
       </synthetic-files>
     </element>
-    <element name="note" total-files="651" wild-files="433" synthetic-files="218" min-synthetic-version="3.0">
+    <element name="note" total-files="653" wild-files="435" synthetic-files="218" min-synthetic-version="3.0">
       <attributes>
         <attribute name="default-x" wild-files="145" synthetic-files="2"/>
         <attribute name="default-y" wild-files="58" synthetic-files="2"/>
@@ -2615,8 +2615,10 @@
         <attribute name="release" wild-files="0" synthetic-files="2"/>
         <attribute name="time-only" wild-files="0" synthetic-files="2"/>
       </attributes>
-      <wild-files count="433">
+      <wild-files count="435">
         <file>custom/musescore-slur-start-stop.musicxml</file>
+        <file>custom/segno_coda_roundtrip.3.0.xml</file>
+        <file>custom/segno_coda_roundtrip.3.1.xml</file>
         <file>custom/systems-and-pages.xml</file>
         <file>custom/transposition.musicxml</file>
         <file>foundsuite/12 Horn Duets.xml</file>
@@ -2626,9 +2628,7 @@
         <file>foundsuite/Berlioz_Le_Corsaire.xml</file>
         <file>foundsuite/Black Note Study Op 10 no 5.xml</file>
         <file>foundsuite/Deutscher Tanz D.820.1.xml</file>
-        <file>foundsuite/Invention 1.xml</file>
-        <file>foundsuite/Invention 2.xml</file>
-        <!-- 421 more -->
+        <!-- 423 more -->
       </wild-files>
       <synthetic-files count="218" min-version="3.0">
         <file version="3.0">synthetic/accent.3.0.xml</file>
@@ -2851,6 +2851,31 @@
         <file version="3.0">synthetic/work-title.3.0.xml</file>
       </synthetic-files>
     </element>
+    <element name="type" total-files="417" wild-files="414" synthetic-files="3" min-synthetic-version="3.0">
+      <attributes>
+        <attribute name="size" wild-files="8" synthetic-files="0"/>
+      </attributes>
+      <wild-files count="414">
+        <file>custom/musescore-slur-start-stop.musicxml</file>
+        <file>custom/segno_coda_roundtrip.3.0.xml</file>
+        <file>custom/segno_coda_roundtrip.3.1.xml</file>
+        <file>custom/systems-and-pages.xml</file>
+        <file>custom/transposition.musicxml</file>
+        <file>foundsuite/12 Horn Duets.xml</file>
+        <file>foundsuite/ARBEAU Belle qui tiens ma vie.xml</file>
+        <file>foundsuite/Adagio and Fugue in C minor, K.546.xml</file>
+        <file>foundsuite/An Chloe.xml</file>
+        <file>foundsuite/Berlioz_Le_Corsaire.xml</file>
+        <file>foundsuite/Black Note Study Op 10 no 5.xml</file>
+        <file>foundsuite/Deutscher Tanz D.820.1.xml</file>
+        <!-- 402 more -->
+      </wild-files>
+      <synthetic-files count="3" min-version="3.0">
+        <file version="3.0">synthetic/cancel.location.3.0.xml</file>
+        <file version="3.0">synthetic/key-accidental.3.0.xml</file>
+        <file version="3.1">synthetic/key-accidental.smufl.3.1.xml</file>
+      </synthetic-files>
+    </element>
     <element name="clef" total-files="417" wild-files="412" synthetic-files="5" min-synthetic-version="3.0">
       <attributes>
         <attribute name="number" wild-files="114" synthetic-files="2"/>
@@ -2939,31 +2964,6 @@
         <file version="4.0">synthetic/part-clef.4.0.xml</file>
       </synthetic-files>
     </element>
-    <element name="type" total-files="415" wild-files="412" synthetic-files="3" min-synthetic-version="3.0">
-      <attributes>
-        <attribute name="size" wild-files="8" synthetic-files="0"/>
-      </attributes>
-      <wild-files count="412">
-        <file>custom/musescore-slur-start-stop.musicxml</file>
-        <file>custom/systems-and-pages.xml</file>
-        <file>custom/transposition.musicxml</file>
-        <file>foundsuite/12 Horn Duets.xml</file>
-        <file>foundsuite/ARBEAU Belle qui tiens ma vie.xml</file>
-        <file>foundsuite/Adagio and Fugue in C minor, K.546.xml</file>
-        <file>foundsuite/An Chloe.xml</file>
-        <file>foundsuite/Berlioz_Le_Corsaire.xml</file>
-        <file>foundsuite/Black Note Study Op 10 no 5.xml</file>
-        <file>foundsuite/Deutscher Tanz D.820.1.xml</file>
-        <file>foundsuite/Invention 1.xml</file>
-        <file>foundsuite/Invention 2.xml</file>
-        <!-- 400 more -->
-      </wild-files>
-      <synthetic-files count="3" min-version="3.0">
-        <file version="3.0">synthetic/cancel.location.3.0.xml</file>
-        <file version="3.0">synthetic/key-accidental.3.0.xml</file>
-        <file version="3.1">synthetic/key-accidental.smufl.3.1.xml</file>
-      </synthetic-files>
-    </element>
     <element name="time" total-files="421" wild-files="411" synthetic-files="10" min-synthetic-version="3.0">
       <attributes>
         <attribute name="symbol" wild-files="110" synthetic-files="2"/>
@@ -3067,9 +3067,11 @@
         <file version="3.1">synthetic/time.3.1.xml</file>
       </synthetic-files>
     </element>
-    <element name="octave" total-files="622" wild-files="404" synthetic-files="218" min-synthetic-version="3.0">
-      <wild-files count="404">
+    <element name="octave" total-files="624" wild-files="406" synthetic-files="218" min-synthetic-version="3.0">
+      <wild-files count="406">
         <file>custom/musescore-slur-start-stop.musicxml</file>
+        <file>custom/segno_coda_roundtrip.3.0.xml</file>
+        <file>custom/segno_coda_roundtrip.3.1.xml</file>
         <file>custom/systems-and-pages.xml</file>
         <file>custom/transposition.musicxml</file>
         <file>foundsuite/12 Horn Duets.xml</file>
@@ -3079,9 +3081,7 @@
         <file>foundsuite/Berlioz_Le_Corsaire.xml</file>
         <file>foundsuite/Black Note Study Op 10 no 5.xml</file>
         <file>foundsuite/Deutscher Tanz D.820.1.xml</file>
-        <file>foundsuite/Invention 1.xml</file>
-        <file>foundsuite/Invention 2.xml</file>
-        <!-- 392 more -->
+        <!-- 394 more -->
       </wild-files>
       <synthetic-files count="218" min-version="3.0">
         <file version="3.0">synthetic/accent.3.0.xml</file>
@@ -3304,9 +3304,11 @@
         <file version="3.0">synthetic/work-title.3.0.xml</file>
       </synthetic-files>
     </element>
-    <element name="pitch" total-files="622" wild-files="404" synthetic-files="218" min-synthetic-version="3.0">
-      <wild-files count="404">
+    <element name="pitch" total-files="624" wild-files="406" synthetic-files="218" min-synthetic-version="3.0">
+      <wild-files count="406">
         <file>custom/musescore-slur-start-stop.musicxml</file>
+        <file>custom/segno_coda_roundtrip.3.0.xml</file>
+        <file>custom/segno_coda_roundtrip.3.1.xml</file>
         <file>custom/systems-and-pages.xml</file>
         <file>custom/transposition.musicxml</file>
         <file>foundsuite/12 Horn Duets.xml</file>
@@ -3316,9 +3318,7 @@
         <file>foundsuite/Berlioz_Le_Corsaire.xml</file>
         <file>foundsuite/Black Note Study Op 10 no 5.xml</file>
         <file>foundsuite/Deutscher Tanz D.820.1.xml</file>
-        <file>foundsuite/Invention 1.xml</file>
-        <file>foundsuite/Invention 2.xml</file>
-        <!-- 392 more -->
+        <!-- 394 more -->
       </wild-files>
       <synthetic-files count="218" min-version="3.0">
         <file version="3.0">synthetic/accent.3.0.xml</file>
@@ -3541,9 +3541,11 @@
         <file version="3.0">synthetic/work-title.3.0.xml</file>
       </synthetic-files>
     </element>
-    <element name="step" total-files="622" wild-files="404" synthetic-files="218" min-synthetic-version="3.0">
-      <wild-files count="404">
+    <element name="step" total-files="624" wild-files="406" synthetic-files="218" min-synthetic-version="3.0">
+      <wild-files count="406">
         <file>custom/musescore-slur-start-stop.musicxml</file>
+        <file>custom/segno_coda_roundtrip.3.0.xml</file>
+        <file>custom/segno_coda_roundtrip.3.1.xml</file>
         <file>custom/systems-and-pages.xml</file>
         <file>custom/transposition.musicxml</file>
         <file>foundsuite/12 Horn Duets.xml</file>
@@ -3553,9 +3555,7 @@
         <file>foundsuite/Berlioz_Le_Corsaire.xml</file>
         <file>foundsuite/Black Note Study Op 10 no 5.xml</file>
         <file>foundsuite/Deutscher Tanz D.820.1.xml</file>
-        <file>foundsuite/Invention 1.xml</file>
-        <file>foundsuite/Invention 2.xml</file>
-        <!-- 392 more -->
+        <!-- 394 more -->
       </wild-files>
       <synthetic-files count="218" min-version="3.0">
         <file version="3.0">synthetic/accent.3.0.xml</file>
@@ -3778,9 +3778,11 @@
         <file version="3.0">synthetic/work-title.3.0.xml</file>
       </synthetic-files>
     </element>
-    <element name="voice" total-files="709" wild-files="403" synthetic-files="306" min-synthetic-version="3.0">
-      <wild-files count="403">
+    <element name="voice" total-files="711" wild-files="405" synthetic-files="306" min-synthetic-version="3.0">
+      <wild-files count="405">
         <file>custom/musescore-slur-start-stop.musicxml</file>
+        <file>custom/segno_coda_roundtrip.3.0.xml</file>
+        <file>custom/segno_coda_roundtrip.3.1.xml</file>
         <file>custom/systems-and-pages.xml</file>
         <file>custom/transposition.musicxml</file>
         <file>foundsuite/12 Horn Duets.xml</file>
@@ -3790,9 +3792,7 @@
         <file>foundsuite/Berlioz_Le_Corsaire.xml</file>
         <file>foundsuite/Black Note Study Op 10 no 5.xml</file>
         <file>foundsuite/Deutscher Tanz D.820.1.xml</file>
-        <file>foundsuite/Invention 1.xml</file>
-        <file>foundsuite/Invention 2.xml</file>
-        <!-- 391 more -->
+        <!-- 393 more -->
       </wild-files>
       <synthetic-files count="306" min-version="3.0">
         <file version="3.0">synthetic/accent.3.0.xml</file>
@@ -4849,14 +4849,16 @@
         <file version="3.0">synthetic/dot.3.0.xml</file>
       </synthetic-files>
     </element>
-    <element name="direction" total-files="249" wild-files="158" synthetic-files="91" min-synthetic-version="3.0">
+    <element name="direction" total-files="251" wild-files="160" synthetic-files="91" min-synthetic-version="3.0">
       <attributes>
         <attribute name="placement" wild-files="149" synthetic-files="2"/>
         <attribute name="directive" wild-files="27" synthetic-files="2"/>
         <attribute name="id" wild-files="0" synthetic-files="2"/>
         <attribute name="system" wild-files="0" synthetic-files="1"/>
       </attributes>
-      <wild-files count="158">
+      <wild-files count="160">
+        <file>custom/segno_coda_roundtrip.3.0.xml</file>
+        <file>custom/segno_coda_roundtrip.3.1.xml</file>
         <file>foundsuite/12 Horn Duets.xml</file>
         <file>foundsuite/Adagio and Fugue in C minor, K.546.xml</file>
         <file>foundsuite/An Chloe.xml</file>
@@ -4867,9 +4869,7 @@
         <file>foundsuite/Moments Musicaux Op16 No4.xml</file>
         <file>foundsuite/PepAiraSco.xml</file>
         <file>foundsuite/PezR44Sco.xml</file>
-        <file>foundsuite/Rimsky-Korsakov Op11 No4.xml</file>
-        <file>foundsuite/RonCLunSco.xml</file>
-        <!-- 146 more -->
+        <!-- 148 more -->
       </wild-files>
       <synthetic-files count="91" min-version="3.0">
         <file version="3.0">synthetic/accordion-registration.3.0.xml</file>
@@ -4965,11 +4965,13 @@
         <file version="3.1">synthetic/words.3.1.xml</file>
       </synthetic-files>
     </element>
-    <element name="direction-type" total-files="249" wild-files="158" synthetic-files="91" min-synthetic-version="3.0">
+    <element name="direction-type" total-files="251" wild-files="160" synthetic-files="91" min-synthetic-version="3.0">
       <attributes>
         <attribute name="id" wild-files="0" synthetic-files="1"/>
       </attributes>
-      <wild-files count="158">
+      <wild-files count="160">
+        <file>custom/segno_coda_roundtrip.3.0.xml</file>
+        <file>custom/segno_coda_roundtrip.3.1.xml</file>
         <file>foundsuite/12 Horn Duets.xml</file>
         <file>foundsuite/Adagio and Fugue in C minor, K.546.xml</file>
         <file>foundsuite/An Chloe.xml</file>
@@ -4980,9 +4982,7 @@
         <file>foundsuite/Moments Musicaux Op16 No4.xml</file>
         <file>foundsuite/PepAiraSco.xml</file>
         <file>foundsuite/PezR44Sco.xml</file>
-        <file>foundsuite/Rimsky-Korsakov Op11 No4.xml</file>
-        <file>foundsuite/RonCLunSco.xml</file>
-        <!-- 146 more -->
+        <!-- 148 more -->
       </wild-files>
       <synthetic-files count="91" min-version="3.0">
         <file version="3.0">synthetic/accordion-registration.3.0.xml</file>
@@ -5775,8 +5775,10 @@
         <file version="3.0">synthetic/word-font.3.0.xml</file>
       </synthetic-files>
     </element>
-    <element name="staff" total-files="453" wild-files="121" synthetic-files="332" min-synthetic-version="3.0">
-      <wild-files count="121">
+    <element name="staff" total-files="455" wild-files="123" synthetic-files="332" min-synthetic-version="3.0">
+      <wild-files count="123">
+        <file>custom/segno_coda_roundtrip.3.0.xml</file>
+        <file>custom/segno_coda_roundtrip.3.1.xml</file>
         <file>foundsuite/ARBEAU Belle qui tiens ma vie.xml</file>
         <file>foundsuite/An Chloe.xml</file>
         <file>foundsuite/Black Note Study Op 10 no 5.xml</file>
@@ -5787,9 +5789,7 @@
         <file>foundsuite/Invention_10.xml</file>
         <file>foundsuite/Invention_11.xml</file>
         <file>foundsuite/Invention_12.xml</file>
-        <file>foundsuite/Invention_13.xml</file>
-        <file>foundsuite/Invention_14.xml</file>
-        <!-- 109 more -->
+        <!-- 111 more -->
       </wild-files>
       <synthetic-files count="332" min-version="3.0">
         <file version="3.0">synthetic/accent.3.0.xml</file>
@@ -10341,6 +10341,34 @@
       <synthetic-files count="0">
       </synthetic-files>
     </element>
+    <element name="segno" total-files="7" wild-files="5" synthetic-files="2" min-synthetic-version="3.0">
+      <attributes>
+        <attribute name="color" wild-files="2" synthetic-files="2"/>
+        <attribute name="default-x" wild-files="2" synthetic-files="2"/>
+        <attribute name="default-y" wild-files="2" synthetic-files="2"/>
+        <attribute name="font-family" wild-files="2" synthetic-files="2"/>
+        <attribute name="font-size" wild-files="2" synthetic-files="2"/>
+        <attribute name="font-style" wild-files="2" synthetic-files="2"/>
+        <attribute name="font-weight" wild-files="2" synthetic-files="2"/>
+        <attribute name="halign" wild-files="2" synthetic-files="2"/>
+        <attribute name="relative-x" wild-files="2" synthetic-files="2"/>
+        <attribute name="relative-y" wild-files="2" synthetic-files="2"/>
+        <attribute name="valign" wild-files="2" synthetic-files="2"/>
+        <attribute name="id" wild-files="1" synthetic-files="1"/>
+        <attribute name="smufl" wild-files="1" synthetic-files="1"/>
+      </attributes>
+      <wild-files count="5">
+        <file>custom/segno_coda_roundtrip.3.0.xml</file>
+        <file>custom/segno_coda_roundtrip.3.1.xml</file>
+        <file>lysuite/ly21f_Chord_ElementInBetween.xml</file>
+        <file>lysuite/ly31a_Directions.xml</file>
+        <file>musuite/testDalSegno.xml</file>
+      </wild-files>
+      <synthetic-files count="2" min-version="3.0">
+        <file version="3.0">synthetic/segno.3.0.xml</file>
+        <file version="3.1">synthetic/segno.3.1.xml</file>
+      </synthetic-files>
+    </element>
     <element name="sffz" total-files="5" wild-files="5" synthetic-files="0">
       <wild-files count="5">
         <file>ksuite/k007a_Notations_Dynamics.xml</file>
@@ -10453,6 +10481,33 @@
         <file version="3.1">synthetic/accidental-text.3.1.xml</file>
       </synthetic-files>
     </element>
+    <element name="coda" total-files="6" wild-files="4" synthetic-files="2" min-synthetic-version="3.0">
+      <attributes>
+        <attribute name="color" wild-files="2" synthetic-files="2"/>
+        <attribute name="default-x" wild-files="2" synthetic-files="2"/>
+        <attribute name="default-y" wild-files="2" synthetic-files="2"/>
+        <attribute name="font-family" wild-files="2" synthetic-files="2"/>
+        <attribute name="font-size" wild-files="2" synthetic-files="2"/>
+        <attribute name="font-style" wild-files="2" synthetic-files="2"/>
+        <attribute name="font-weight" wild-files="2" synthetic-files="2"/>
+        <attribute name="halign" wild-files="2" synthetic-files="2"/>
+        <attribute name="relative-x" wild-files="2" synthetic-files="2"/>
+        <attribute name="relative-y" wild-files="2" synthetic-files="2"/>
+        <attribute name="valign" wild-files="2" synthetic-files="2"/>
+        <attribute name="id" wild-files="1" synthetic-files="1"/>
+        <attribute name="smufl" wild-files="1" synthetic-files="1"/>
+      </attributes>
+      <wild-files count="4">
+        <file>custom/segno_coda_roundtrip.3.0.xml</file>
+        <file>custom/segno_coda_roundtrip.3.1.xml</file>
+        <file>lysuite/ly31a_Directions.xml</file>
+        <file>musuite/testDCalCoda.xml</file>
+      </wild-files>
+      <synthetic-files count="2" min-version="3.0">
+        <file version="3.0">synthetic/coda.3.0.xml</file>
+        <file version="3.1">synthetic/coda.3.1.xml</file>
+      </synthetic-files>
+    </element>
     <element name="cue" total-files="4" wild-files="4" synthetic-files="0">
       <wild-files count="4">
         <file>mjbsuite/krz_v40.xml</file>
@@ -11156,32 +11211,6 @@
       <synthetic-files count="0">
       </synthetic-files>
     </element>
-    <element name="segno" total-files="5" wild-files="3" synthetic-files="2" min-synthetic-version="3.0">
-      <attributes>
-        <attribute name="color" wild-files="0" synthetic-files="2"/>
-        <attribute name="default-x" wild-files="0" synthetic-files="2"/>
-        <attribute name="default-y" wild-files="0" synthetic-files="2"/>
-        <attribute name="font-family" wild-files="0" synthetic-files="2"/>
-        <attribute name="font-size" wild-files="0" synthetic-files="2"/>
-        <attribute name="font-style" wild-files="0" synthetic-files="2"/>
-        <attribute name="font-weight" wild-files="0" synthetic-files="2"/>
-        <attribute name="halign" wild-files="0" synthetic-files="2"/>
-        <attribute name="id" wild-files="0" synthetic-files="1"/>
-        <attribute name="relative-x" wild-files="0" synthetic-files="2"/>
-        <attribute name="relative-y" wild-files="0" synthetic-files="2"/>
-        <attribute name="smufl" wild-files="0" synthetic-files="1"/>
-        <attribute name="valign" wild-files="0" synthetic-files="2"/>
-      </attributes>
-      <wild-files count="3">
-        <file>lysuite/ly21f_Chord_ElementInBetween.xml</file>
-        <file>lysuite/ly31a_Directions.xml</file>
-        <file>musuite/testDalSegno.xml</file>
-      </wild-files>
-      <synthetic-files count="2" min-version="3.0">
-        <file version="3.0">synthetic/segno.3.0.xml</file>
-        <file version="3.1">synthetic/segno.3.1.xml</file>
-      </synthetic-files>
-    </element>
     <element name="accidental-mark" total-files="4" wild-files="2" synthetic-files="2" min-synthetic-version="3.0">
       <attributes>
         <attribute name="placement" wild-files="1" synthetic-files="2"/>
@@ -11257,31 +11286,6 @@
         <file version="3.1">synthetic/accordion-registration.3.1.xml</file>
       </synthetic-files>
     </element>
-    <element name="coda" total-files="4" wild-files="2" synthetic-files="2" min-synthetic-version="3.0">
-      <attributes>
-        <attribute name="color" wild-files="0" synthetic-files="2"/>
-        <attribute name="default-x" wild-files="0" synthetic-files="2"/>
-        <attribute name="default-y" wild-files="0" synthetic-files="2"/>
-        <attribute name="font-family" wild-files="0" synthetic-files="2"/>
-        <attribute name="font-size" wild-files="0" synthetic-files="2"/>
-        <attribute name="font-style" wild-files="0" synthetic-files="2"/>
-        <attribute name="font-weight" wild-files="0" synthetic-files="2"/>
-        <attribute name="halign" wild-files="0" synthetic-files="2"/>
-        <attribute name="id" wild-files="0" synthetic-files="1"/>
-        <attribute name="relative-x" wild-files="0" synthetic-files="2"/>
-        <attribute name="relative-y" wild-files="0" synthetic-files="2"/>
-        <attribute name="smufl" wild-files="0" synthetic-files="1"/>
-        <attribute name="valign" wild-files="0" synthetic-files="2"/>
-      </attributes>
-      <wild-files count="2">
-        <file>lysuite/ly31a_Directions.xml</file>
-        <file>musuite/testDCalCoda.xml</file>
-      </wild-files>
-      <synthetic-files count="2" min-version="3.0">
-        <file version="3.0">synthetic/coda.3.0.xml</file>
-        <file version="3.1">synthetic/coda.3.1.xml</file>
-      </synthetic-files>
-    </element>
     <element name="double-tongue" total-files="3" wild-files="2" synthetic-files="1" min-synthetic-version="3.0">
       <attributes>
         <attribute name="color" wild-files="0" synthetic-files="1"/>
diff --git a/data/custom/segno_coda_roundtrip.3.0.features.xml b/data/custom/segno_coda_roundtrip.3.0.features.xml
new file mode 100644
index 00000000..6f53e1dd
--- /dev/null
+++ b/data/custom/segno_coda_roundtrip.3.0.features.xml
@@ -0,0 +1,107 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Generated by `python3 -m audit files`. The element/attribute surface of the
+     sibling corpus file. Do not edit by hand; regenerate with the audit tool. -->
+<feature-audit>
+  <audited>custom/segno_coda_roundtrip.3.0.xml</audited>
+  <audited-version>3.0</audited-version>
+  <features>
+    <feature>
+      <name>attributes</name>
+    </feature>
+    <feature>
+      <name>coda</name>
+      <attributes>
+        <attribute>color</attribute>
+        <attribute>default-x</attribute>
+        <attribute>default-y</attribute>
+        <attribute>font-family</attribute>
+        <attribute>font-size</attribute>
+        <attribute>font-style</attribute>
+        <attribute>font-weight</attribute>
+        <attribute>halign</attribute>
+        <attribute>relative-x</attribute>
+        <attribute>relative-y</attribute>
+        <attribute>valign</attribute>
+      </attributes>
+    </feature>
+    <feature>
+      <name>direction</name>
+    </feature>
+    <feature>
+      <name>direction-type</name>
+    </feature>
+    <feature>
+      <name>divisions</name>
+    </feature>
+    <feature>
+      <name>duration</name>
+    </feature>
+    <feature>
+      <name>measure</name>
+      <attributes>
+        <attribute>number</attribute>
+      </attributes>
+    </feature>
+    <feature>
+      <name>note</name>
+    </feature>
+    <feature>
+      <name>octave</name>
+    </feature>
+    <feature>
+      <name>part</name>
+      <attributes>
+        <attribute>id</attribute>
+      </attributes>
+    </feature>
+    <feature>
+      <name>part-list</name>
+    </feature>
+    <feature>
+      <name>part-name</name>
+    </feature>
+    <feature>
+      <name>pitch</name>
+    </feature>
+    <feature>
+      <name>score-part</name>
+      <attributes>
+        <attribute>id</attribute>
+      </attributes>
+    </feature>
+    <feature>
+      <name>score-partwise</name>
+      <attributes>
+        <attribute>version</attribute>
+      </attributes>
+    </feature>
+    <feature>
+      <name>segno</name>
+      <attributes>
+        <attribute>color</attribute>
+        <attribute>default-x</attribute>
+        <attribute>default-y</attribute>
+        <attribute>font-family</attribute>
+        <attribute>font-size</attribute>
+        <attribute>font-style</attribute>
+        <attribute>font-weight</attribute>
+        <attribute>halign</attribute>
+        <attribute>relative-x</attribute>
+        <attribute>relative-y</attribute>
+        <attribute>valign</attribute>
+      </attributes>
+    </feature>
+    <feature>
+      <name>staff</name>
+    </feature>
+    <feature>
+      <name>step</name>
+    </feature>
+    <feature>
+      <name>type</name>
+    </feature>
+    <feature>
+      <name>voice</name>
+    </feature>
+  </features>
+</feature-audit>
diff --git a/data/custom/segno_coda_roundtrip.3.0.xml b/data/custom/segno_coda_roundtrip.3.0.xml
new file mode 100644
index 00000000..96e8b888
--- /dev/null
+++ b/data/custom/segno_coda_roundtrip.3.0.xml
@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<score-partwise version="3.0">
+  <part-list>
+    <score-part id="P1">
+      <part-name>x</part-name>
+    </score-part>
+  </part-list>
+  <part id="P1">
+    <measure number="1">
+      <attributes>
+        <divisions>1</divisions>
+      </attributes>
+      <direction>
+        <direction-type>
+          <segno default-x="1.1" default-y="2.2" relative-x="3.3" relative-y="4.4" font-family="x" font-style="italic" font-size="5.5" font-weight="bold" color="#12345678" halign="center" valign="middle" />
+        </direction-type>
+        <staff>1</staff>
+      </direction>
+      <direction>
+        <direction-type>
+          <coda default-x="6.6" default-y="7.7" relative-x="8.8" relative-y="9.9" font-family="y" font-style="italic" font-size="11.1" font-weight="bold" color="#9ABCDEF0" halign="right" valign="bottom" />
+        </direction-type>
+        <staff>1</staff>
+      </direction>
+      <note>
+        <pitch>
+          <step>C</step>
+          <octave>4</octave>
+        </pitch>
+        <duration>1</duration>
+        <voice>1</voice>
+        <type>quarter</type>
+      </note>
+    </measure>
+  </part>
+</score-partwise>
diff --git a/data/custom/segno_coda_roundtrip.3.1.features.xml b/data/custom/segno_coda_roundtrip.3.1.features.xml
new file mode 100644
index 00000000..0f8e9325
--- /dev/null
+++ b/data/custom/segno_coda_roundtrip.3.1.features.xml
@@ -0,0 +1,111 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Generated by `python3 -m audit files`. The element/attribute surface of the
+     sibling corpus file. Do not edit by hand; regenerate with the audit tool. -->
+<feature-audit>
+  <audited>custom/segno_coda_roundtrip.3.1.xml</audited>
+  <audited-version>3.0</audited-version>
+  <features>
+    <feature>
+      <name>attributes</name>
+    </feature>
+    <feature>
+      <name>coda</name>
+      <attributes>
+        <attribute>color</attribute>
+        <attribute>default-x</attribute>
+        <attribute>default-y</attribute>
+        <attribute>font-family</attribute>
+        <attribute>font-size</attribute>
+        <attribute>font-style</attribute>
+        <attribute>font-weight</attribute>
+        <attribute>halign</attribute>
+        <attribute>id</attribute>
+        <attribute>relative-x</attribute>
+        <attribute>relative-y</attribute>
+        <attribute>smufl</attribute>
+        <attribute>valign</attribute>
+      </attributes>
+    </feature>
+    <feature>
+      <name>direction</name>
+    </feature>
+    <feature>
+      <name>direction-type</name>
+    </feature>
+    <feature>
+      <name>divisions</name>
+    </feature>
+    <feature>
+      <name>duration</name>
+    </feature>
+    <feature>
+      <name>measure</name>
+      <attributes>
+        <attribute>number</attribute>
+      </attributes>
+    </feature>
+    <feature>
+      <name>note</name>
+    </feature>
+    <feature>
+      <name>octave</name>
+    </feature>
+    <feature>
+      <name>part</name>
+      <attributes>
+        <attribute>id</attribute>
+      </attributes>
+    </feature>
+    <feature>
+      <name>part-list</name>
+    </feature>
+    <feature>
+      <name>part-name</name>
+    </feature>
+    <feature>
+      <name>pitch</name>
+    </feature>
+    <feature>
+      <name>score-part</name>
+      <attributes>
+        <attribute>id</attribute>
+      </attributes>
+    </feature>
+    <feature>
+      <name>score-partwise</name>
+      <attributes>
+        <attribute>version</attribute>
+      </attributes>
+    </feature>
+    <feature>
+      <name>segno</name>
+      <attributes>
+        <attribute>color</attribute>
+        <attribute>default-x</attribute>
+        <attribute>default-y</attribute>
+        <attribute>font-family</attribute>
+        <attribute>font-size</attribute>
+        <attribute>font-style</attribute>
+        <attribute>font-weight</attribute>
+        <attribute>halign</attribute>
+        <attribute>id</attribute>
+        <attribute>relative-x</attribute>
+        <attribute>relative-y</attribute>
+        <attribute>smufl</attribute>
+        <attribute>valign</attribute>
+      </attributes>
+    </feature>
+    <feature>
+      <name>staff</name>
+    </feature>
+    <feature>
+      <name>step</name>
+    </feature>
+    <feature>
+      <name>type</name>
+    </feature>
+    <feature>
+      <name>voice</name>
+    </feature>
+  </features>
+</feature-audit>
diff --git a/data/custom/segno_coda_roundtrip.3.1.xml b/data/custom/segno_coda_roundtrip.3.1.xml
new file mode 100644
index 00000000..53c8a0ce
--- /dev/null
+++ b/data/custom/segno_coda_roundtrip.3.1.xml
@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<score-partwise version="3.1">
+  <part-list>
+    <score-part id="P1">
+      <part-name>x</part-name>
+    </score-part>
+  </part-list>
+  <part id="P1">
+    <measure number="1">
+      <attributes>
+        <divisions>1</divisions>
+      </attributes>
+      <direction>
+        <direction-type>
+          <segno default-x="1.1" default-y="2.2" relative-x="3.3" relative-y="4.4" font-family="x" font-style="italic" font-size="5.5" font-weight="bold" color="#12345678" halign="center" valign="middle" id="id3" smufl="segno" />
+        </direction-type>
+        <staff>1</staff>
+      </direction>
+      <direction>
+        <direction-type>
+          <coda default-x="6.6" default-y="7.7" relative-x="8.8" relative-y="9.9" font-family="y" font-style="italic" font-size="11.1" font-weight="bold" color="#9ABCDEF0" halign="right" valign="bottom" id="id4" smufl="coda" />
+        </direction-type>
+        <staff>1</staff>
+      </direction>
+      <note>
+        <pitch>
+          <step>C</step>
+          <octave>4</octave>
+        </pitch>
+        <duration>1</duration>
+        <voice>1</voice>
+        <type>quarter</type>
+      </note>
+    </measure>
+  </part>
+</score-partwise>
diff --git a/src/private/mxtest/api/ApiLoadSurvivalTest.cpp b/src/private/mxtest/api/ApiLoadSmokeTest.cpp
similarity index 68%
rename from src/private/mxtest/api/ApiLoadSurvivalTest.cpp
rename to src/private/mxtest/api/ApiLoadSmokeTest.cpp
index 7d3fcee3..feba0bf3 100644
--- a/src/private/mxtest/api/ApiLoadSurvivalTest.cpp
+++ b/src/private/mxtest/api/ApiLoadSmokeTest.cpp
@@ -12,11 +12,15 @@
 
 namespace mxtest
 {
-class ApiLoadSurvivalTest : public mxtest::MxFileTest
+// Smoke test: proves each registered file imports and produces at least one part
+// (createFromFile -> getData succeeds with a non-empty ScoreData::parts), NOT that the
+// data is correct -- dropped or mistranslated elements still pass. Fidelity is the
+// round-trip gate (roundtrip-baseline.txt).
+class ApiLoadSmokeTest : public mxtest::MxFileTest
 {
   public:
-    ApiLoadSurvivalTest(mxtest::MxFile inTestFile, std::string inTestName, std::string inTestCppFileName,
-                        int inTestCppFileLineNumber)
+    ApiLoadSmokeTest(mxtest::MxFile inTestFile, std::string inTestName, std::string inTestCppFileName,
+                     int inTestCppFileLineNumber)
         : mxtest::MxFileTest(inTestFile, inTestName, inTestCppFileName, inTestCppFileLineNumber)
     {
     }
@@ -51,8 +55,8 @@ class ApiLoadSurvivalTest : public mxtest::MxFileTest
     }
 };
 
-MxFileTestGroup<ApiLoadSurvivalTest> instance{MX_COMPILE_MAX_FILE_SIZE_BYTES, // maxFileSizeBytes
-                                              "Api Load Survival Test", __FILE__, __LINE__};
+MxFileTestGroup<ApiLoadSmokeTest> instance{MX_COMPILE_MAX_FILE_SIZE_BYTES, // maxFileSizeBytes
+                                           "Api Load Smoke Test", __FILE__, __LINE__};
 } // namespace mxtest
 
 #endif
diff --git a/src/private/mxtest/api/roundtrip-baseline.txt b/src/private/mxtest/api/roundtrip-baseline.txt
index 176f4138..79f2ad25 100644
--- a/src/private/mxtest/api/roundtrip-baseline.txt
+++ b/src/private/mxtest/api/roundtrip-baseline.txt
@@ -59,3 +59,9 @@ lysuite/ly46f_IncompleteMeasures.xml
 lysuite/ly71a_Chordnames.xml
 lysuite/ly72a_TransposingInstruments.xml
 lysuite/ly72b_TransposingInstruments_Full.xml
+
+# Dedicated segno/coda api read->write->read fixtures (#204): a minimal score that
+# isolates the segno/coda surface (3.0 base attributes; 3.1 adds id + smufl) and
+# round-trips losslessly.
+custom/segno_coda_roundtrip.3.0.xml
+custom/segno_coda_roundtrip.3.1.xml
diff --git a/src/private/mxtest/corert/CoreRoundtripTest.cpp b/src/private/mxtest/corert/CoreRoundtripTest.cpp
index ce3040a6..f673e30b 100644
--- a/src/private/mxtest/corert/CoreRoundtripTest.cpp
+++ b/src/private/mxtest/corert/CoreRoundtripTest.cpp
@@ -127,12 +127,12 @@ const CoreRoundtripRegistrar g_coreRoundtripRegistrar;
 
 } // namespace
 
-// Pinned counts: 829 eligible files, none skipped. Count drift is a failure
+// Pinned counts: 831 eligible files, none skipped. Count drift is a failure
 // even with zero individual fails, so a corpus or version-gate change is a
 // conscious decision, not silent decay. Registered last (registration is
 // discovery order; "zz" keeps it last alphabetically for shuffled runs too).
 TEST_CASE("zz-corert-pinned-counts", "[core-roundtrip]")
 {
-    CHECK(mxtest::corert::discoverInputFiles().size() == 829);
+    CHECK(mxtest::corert::discoverInputFiles().size() == 831);
     CHECK(g_skippedCount == 0);
 }
diff --git a/src/private/mxtest/file/MxFileRepositoy.cpp b/src/private/mxtest/file/MxFileRepositoy.cpp
index 5792bdd1..56187ca1 100644
--- a/src/private/mxtest/file/MxFileRepositoy.cpp
+++ b/src/private/mxtest/file/MxFileRepositoy.cpp
@@ -464,8 +464,16 @@ void MxFileRepository::initializeNameSubdirectoryMap()
     myNameSubdirectoryMap.emplace("musescore-slur-start-stop.musicxml", "custom");
     myNameSubdirectoryMap.emplace("systems-and-pages.xml", "custom");
     myNameSubdirectoryMap.emplace("transposition.musicxml", "custom");
+    myNameSubdirectoryMap.emplace("segno_coda_roundtrip.3.0.xml", "custom");
+    myNameSubdirectoryMap.emplace("segno_coda_roundtrip.3.1.xml", "custom");
 
     // mxl
     myNameSubdirectoryMap.emplace("Dichterliebe01.mxl", "mxl");
+
+    // synthetic (audit-generated single-feature fixtures)
+    myNameSubdirectoryMap.emplace("segno.3.0.xml", "synthetic");
+    myNameSubdirectoryMap.emplace("segno.3.1.xml", "synthetic");
+    myNameSubdirectoryMap.emplace("coda.3.0.xml", "synthetic");
+    myNameSubdirectoryMap.emplace("coda.3.1.xml", "synthetic");
 }
 } // namespace mxtest