Phase 4: regenerating ore veins, each tier in one zone

Regenerating Ore Veins 1.4.0 (CurseForge only, MIT). tools/zone_ores.py
writes its config from world/zones.json: surface zones as boxes from the
zone grid, cave tiers by cave biome, 21 tiers including Cobblemon's
evolution stones (their natural ores are off). The world report now
allows ore only in tracked veins inside their tier's zone. Self-tests:
a mined vein regrows after its chunk unloads and after a restart (new
after_restart pass in selftest.py and quick_check.py). make_world places
showcase veins.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tools/mcserver.py

@@ -227,9 +227,12 @@ class Server:
                 failures.append(f"{label}: {check['command']!r} did not match {check['expect']!r}")
         return failures
 
-    def run_selftest(self, timeout=300):
-        """Run the companion mod's in-game tests (needs SELFTEST_JVM_ARGS); returns the failures."""
-        reply = self.command("cobblesurvival selftest run").strip()
+    def run_selftest(self, timeout=300, after_restart=False):
+        """Run the companion mod's in-game tests (needs SELFTEST_JVM_ARGS); returns the failures.
+
+        after_restart runs the second halves of the cases that span a restart (stop, start again, then call this).
+        """
+        reply = self.command("cobblesurvival selftest run" + (" after_restart" if after_restart else "")).strip()
         if "started" not in reply:
             return [f"selftest did not start: {reply!r}"]
         print(f"  {reply}")