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>

tests/e2e/nodes/node_app.py

@@ -0,0 +1,38 @@
+# retoor <retoor@molodetz.nl>
+
+import asyncio
+
+from fastapi import FastAPI
+
+
+def build() -> FastAPI:
+    from devplacepy.database import init_db, refresh_snapshot, set_setting
+    from devplacepy.routers.nodes import router
+    from devplacepy.services.manager import service_manager
+    from devplacepy.services.nodes.service import NodesService
+
+    app = FastAPI()
+    app.include_router(router, prefix="/nodes")
+    service = NodesService()
+
+    @app.on_event("startup")
+    async def start() -> None:
+        init_db()
+        set_setting("nodes_enabled", "1")
+        set_setting("nodes_allow_unknown_class", "1")
+        service_manager.register(service)
+        service_manager.set_lock_owner(True)
+        service_manager.supervise()
+        service.scheduler.destination_ready = lambda target: True
+        await asyncio.sleep(0)
+
+    @app.middleware("http")
+    async def fresh_snapshot(request, call_next):
+        refresh_snapshot()
+        return await call_next(request)
+
+    @app.get("/stats")
+    async def stats() -> dict:
+        return {"connected": service.registry.count(), "counters": service.counters.snapshot()}
+
+    return app