fix(fips): harden companion mesh joins

core/archipelago/src/fips/anchors.rs

@@ -156,7 +156,24 @@ pub async fn load(data_dir: &Path) -> Result<Vec<SeedAnchor>> {
         .with_context(|| format!("read {}", path.display()))?;
     let anchors: Vec<SeedAnchor> =
         serde_json::from_slice(&bytes).with_context(|| format!("parse {}", path.display()))?;
-    Ok(anchors)
+    Ok(repair_legacy_anchor_set(anchors))
+}
+
+/// Add the newer redundant public TCP anchors to legacy files that only carry
+/// the Archipelago-operated vps2 anchor. A deliberately custom/private anchor
+/// list remains authoritative; this only repairs the exact stale shape shipped
+/// before the join.fips.network anchors became defaults.
+fn repair_legacy_anchor_set(mut anchors: Vec<SeedAnchor>) -> Vec<SeedAnchor> {
+    let has_archy = anchors.iter().any(|a| a.npub == ARCHY_ANCHOR_NPUB);
+    let has_fips_network = fips_network_anchors()
+        .iter()
+        .any(|default| anchors.iter().any(|a| a.npub == default.npub));
+    if has_archy && !has_fips_network {
+        for anchor in fips_network_anchors() {
+            anchors.push(anchor);
+        }
+    }
+    anchors
 }
 
 /// Persist the list. Overwrites atomically via write-then-rename so a
@@ -338,6 +355,30 @@ mod tests {
         assert!(got.iter().all(|a| a.transport == "tcp"));
     }
 
+    #[tokio::test]
+    async fn load_repairs_legacy_archy_only_anchor_file() {
+        let dir = tempfile::tempdir().unwrap();
+        save(dir.path(), &[archy_anchor()]).await.unwrap();
+
+        let got = load(dir.path()).await.unwrap();
+        assert!(got.iter().any(|a| a.npub == ARCHY_ANCHOR_NPUB));
+        for anchor in fips_network_anchors() {
+            assert!(got.iter().any(|a| a.npub == anchor.npub));
+        }
+    }
+
+    #[tokio::test]
+    async fn load_keeps_private_anchor_file_authoritative() {
+        let dir = tempfile::tempdir().unwrap();
+        let private = mk("npub1private");
+        save(dir.path(), std::slice::from_ref(&private))
+            .await
+            .unwrap();
+
+        let got = load(dir.path()).await.unwrap();
+        assert_eq!(got, vec![private]);
+    }
+
     #[tokio::test]
     async fn removing_one_default_persists_and_keeps_the_other() {
         // Editing the anchor list (here removing one default) makes the file