Code Farm: per-plot auto-replant pause and crop-lock check; community sync and node work

Continuous Delivery could never be turned off once a crop was planted. Add a
one-shot per-plot "stop after harvest" flag (POST /game/plot/stop, Devii tool
game_plot_stop, game_plots.stop_after_harvest), cleared by the next plant,
autoreplant claim or Refactor. Autoreplant now also respects crop locks through
the shared _crop_lock predicate. Plan and measurements in happyplanting.md.

Also includes the pending community sync, node network and related work in the
tree; the full suite passed (4999) with all of it.

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

locustfile.py

@@ -1716,6 +1716,14 @@ class DevPlaceUser(HttpUser):
             name="game/plant",
         )
 
+    @task(1)
+    def game_plot_stop(self):
+        self.client.post(
+            "/game/plot/stop",
+            data={"slot": random.randint(0, 3), "stop": random.choice(["true", "false"])},
+            name="game/plot/stop",
+        )
+
     @task(2)
     def game_harvest(self):
         self.client.post(