Ψ-W1-T1 second-round remediation: ±1-frame bounds tolerance, self-cleanup a refused render, hedge two unverified render-source inferences

Loosens the exact-bounds gate against REAPER's edge rounding; deletes the bytes a BoundsMismatch refusal writes, per prune_fs's self-cleanup carve-out.

tests/test_render_settings.cpp

@@ -246,9 +246,10 @@ static void testRangedItemScopeRendersTimeBounded() {
 static void testMultiTrackRangedItemRenderIsNamedForRefusal() {
     // The one shape that cannot land: a ranged item capture (item scope re-sourced to
     // the selected-tracks render) whose items span more than one track. That source
-    // renders one file per track with no single-file bit available, so N stems would
-    // collapse onto one render pattern and one track's audio would land as a
-    // successful capture.
+    // is INFERRED to render one file per track with no single-file bit available
+    // (unverified; see src/shell/capture/CLAUDE.md §Gotchas for what that inference
+    // rests on), so N stems would collapse onto one render pattern and one track's
+    // audio would land as a successful capture.
     CHECK(isMultiTrackRangedItemRender(CaptureScope::Item,
                                        SourceMode::SelectedTracks, 2));
     CHECK(isMultiTrackRangedItemRender(CaptureScope::Item,

tests/test_track_topology.cpp

@@ -70,6 +70,15 @@ static void testUnterminatedFolderSwallowsTheRest() {
     CHECK(sameIndices(directChildIndices(depths, 0), {1, 2}));
 }
 
+static void testSiblingFolderAfterParentClosesIsNotIncluded() {
+    // 0: folder parent, 1: child, 2: last child (closes it). 3: an unrelated sibling
+    // folder that opens AFTER track 0's folder has already closed, 4: its child, 5:
+    // its last child. A walk that fails to stop at track 0's own close would keep
+    // consuming and wrongly pull the sibling's children in too.
+    const std::vector<int> depths{1, 0, -1, 1, 0, -1};
+    CHECK(sameIndices(directChildIndices(depths, 0), {1, 2}));
+}
+
 int main() {
     testFlatProjectHasNoChildren();
     testFolderParentReturnsItsDirectChildren();
@@ -77,6 +86,7 @@ int main() {
     testMultiLevelCloseEndsTheOuterFolderToo();
     testNonFolderAndOutOfRangeReturnEmpty();
     testUnterminatedFolderSwallowsTheRest();
+    testSiblingFolderAfterParentClosesIsNotIncluded();
 
     if (g_fail == 0) std::printf("track_topology: all tests passed\n");
     return g_fail == 0 ? 0 : 1;