Q-W1 code-review follow-ups: restore 104 trailing newlines, relocate reasampler_uid.h to core/wire, drop ext_keys namespaces shim, add slot_map_tests, golden serialize literals for 4 modules, namespaces.h/pragma-once ordering sweep. 60/60 green.

tests/test_bank_model.cpp

@@ -104,6 +104,30 @@ static void testFullFieldRoundTrip() {
     }
 }
 
+// Golden byte-literal (Q-W1 T?-05 follow-up): pins the EXACT serialized bytes for
+// a small fixture, not just self-consistent re-serialization — a format drift
+// that round-trips losslessly (e.g. a renamed key both writer and reader agree
+// on) would slip past testFullFieldRoundTrip but not this. The format is frozen
+// as-shipped; the literal below is the captured current output.
+static void testSerializeGoldenLiteral() {
+    BankModel idx;
+    Sample s;
+    s.id = "g1";
+    s.relativePath = "bank/g1.wav";
+    s.contentHash = "hash-g1";
+    CHECK(idx.add(s) == AddResult::Added);
+    CHECK(idx.serialize() ==
+          "{\"version\":1,\"samples\":[{\"id\":\"g1\",\"displayName\":\"\","
+          "\"relativePath\":\"bank/g1.wav\",\"sourceMode\":0,\"sourceRange\":{"
+          "\"startSeconds\":0,\"endSeconds\":0,\"startPpq\":0,\"endPpq\":0},"
+          "\"trackGuids\":[],\"wetDry\":1,\"channelCount\":0,\"sampleRate\":0,"
+          "\"lengthSeconds\":0,\"lengthBeats\":0,\"captureTempo\":0,"
+          "\"captureTimeSigNum\":0,\"captureTimeSigDenom\":0,\"key\":null,"
+          "\"rootNote\":null,\"loop\":null,\"levels\":{\"peakDb\":0,\"rmsDb\":0,"
+          "\"lufs\":0},\"clipped\":false,\"tier\":0,\"contentHash\":\"hash-g1\","
+          "\"provenance\":null,\"createdTimestamp\":0}]}");
+}
+
 static void testDedupByHash() {
     BankModel idx;
     Sample a = fullSample("x");
@@ -551,6 +575,7 @@ static void testSeamFieldsAdditiveInvariant() {
 
 int main() {
     testFullFieldRoundTrip();
+    testSerializeGoldenLiteral();
     testDedupByHash();
     testTierFilterAndMove();
     testRelativePathInvariant();