Show what keeps a chunk in /rewild why when it's unknown

src/main/java/com/extantape/rewild/scan/Scanner.java

@@ -147,15 +147,15 @@ public Verdict evaluate(int x, int z) {
         if (r == null || !r.known) {
             why.add(r == null ? "no tracking history: it was generated before tracking began, or never changed"
                     : "generated before tracking began, so natural and player-placed blocks can't be told apart");
-            return new Verdict(x, z, Kind.UNKNOWN, why, 0);
+            return unknown(x, z, why);
         }
         if (r.bornAt < ctx.everyBlockSince) {
             why.add("generated before Rewild recorded every player-placed block (0.3.0), so a build there could be lost");
-            return new Verdict(x, z, Kind.UNKNOWN, why, 0);
+            return unknown(x, z, why);
         }
         if (r.epoch != ctx.epoch) {
             why.add("generated before the world generator changed, so a reset wouldn't blend");
-            return new Verdict(x, z, Kind.UNKNOWN, why, 0);
+            return unknown(x, z, why);
         }
         List<Reason> keep = keepReasons(x, z);
         boolean fullDamage = r.removed() >= s.minRemovedBlocks() || r.explosionBlocks >= s.minExplosionBlocks();
@@ -196,6 +196,12 @@ public Verdict evaluate(int x, int z) {
         return new Verdict(x, z, Kind.UNDAMAGED, why, 0);
     }
 
+    /** An unknown chunk never resets; any keep that also covers it is listed too, so /rewild why shows it. */
+    private Verdict unknown(int x, int z, List<String> why) {
+        for (Reason reason : keepReasons(x, z)) why.add("also kept: " + reason.text());
+        return new Verdict(x, z, Kind.UNKNOWN, why, 0);
+    }
+
     /** What stays as it is when the chunk rewilds, or null if nothing known yet. Listed blocks are found at restart. */
     String staysInPlace(ChunkRecord r) {
         List<String> parts = new ArrayList<>();

src/test/java/com/extantape/rewild/scan/ScannerTest.java

@@ -118,6 +118,17 @@ void untrackedChunkIsUnknownAndNeverQueued() {
         assertFalse(Scanner.candidates(records, ctx).contains(r.key()));
     }
 
+    @Test
+    void unknownChunkStillNamesWhatKeepsIt() {
+        // Found on the 26.2 clone: the station's own chunk predates tracking, and /rewild why only said "unknown".
+        ChunkRecord r = minedOut(0, 0);
+        r.known = false;
+        ctx.external.put(ChunkRecord.key(0, 0), List.of("the station (Waystation)"));
+        Scanner.Verdict v = verdict(0, 0);
+        assertEquals(Scanner.Kind.UNKNOWN, v.kind());
+        assertTrue(String.join(" ", v.reasons()).contains("also kept: the station (Waystation)"), v.reasons().toString());
+    }
+
     @Test
     void chunkFromAnOlderGeneratorIsUnknown() {
         minedOut(0, 0).epoch = 0;