v0.331.0: a removal deletes the volumes still labelled with the app's project that its definition no longer declares (R-1117)

compose down --volumes removes only the current definition's volumes; a volume a template dropped (or an older restore
re-created) survived 'remove with data' on 9202 (nextcloud_nextcloud_redis_data). Red-proofed.

controller/internal/stacks/delete.go

@@ -756,6 +756,17 @@ func (m *Manager) RemoveStack(name string, removeHDDData bool, backupPathsToRemo
 	if n := m.RemoveUndoCopies(name); n > 0 {
 		m.logger.Printf("[INFO] [stacks] RemoveStack %s: removed %d undo copy volume(s)", name, n)
 	}
+	// R-1117: `down --volumes` removes only what the CURRENT definition declares. A volume a template dropped (or a
+	// restore re-created from an older unit) still carries the app's project label and outlived the removal (measured
+	// on 9202, 2026-10-18: nextcloud_nextcloud_redis_data). The removal removes volumes, so those go too — by name, and
+	// only the ones labelled with THIS project. Pinned by TestR1117_RemoveDeletesALabelledVolumeTheDefinitionNoLongerDeclares.
+	for _, v := range m.projectVolumes(name) {
+		if out, err := m.execCommand("docker", "volume", "rm", v); err != nil {
+			m.logger.Printf("[WARN] [stacks] RemoveStack %s: leftover volume %s not removed: %v (%s)", name, v, err, strings.TrimSpace(out))
+		} else {
+			m.logger.Printf("[INFO] [stacks] RemoveStack %s: removed leftover volume %s (the app's project label; not in its definition — R-1117)", name, v)
+		}
+	}
 
 	// Step 3: the volumes that are gone now — `[]` when none, never null (R-489).
 	resp.VolumesRemoved = removedVolumes(volsBefore, m.appVolumeSet(name, stackDir))