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/unit/services/nodes/scheduler.py

@@ -43,7 +43,7 @@ def settings(**overrides):
 
 
 def node(uid="d1", user="u1", modes=("fetch",), **overrides):
-    session = NodeSession(FakeSocket(), {"uid": uid, "user_uid": user, "kind": "native"})
+    session = NodeSession(FakeSocket(), {"uid": uid, "user_uid": user, "kind": "native", "asn_class": "residential"})
     session.hello = {"modes": list(modes)}
     session.settings = settings(**overrides)
     session.roll_day()
@@ -281,3 +281,48 @@ def test_choose_applies_the_owner_exclusion_to_a_shared_candidate_list(world):
     assert world.choose(found, "bob") is mine
     assert world.choose([mine], "alice") is None
     assert world.choose([], "") is None
+
+
+def test_a_datacenter_donor_is_not_scheduled(world):
+    session = add(world)
+    session.asn_class = "datacenter"
+    assert world.pick(TARGET) is None
+
+
+def test_an_unknown_class_is_refused_unless_the_site_allows_it(world, local_db):
+    from devplacepy.database import set_setting
+
+    session = add(world)
+    session.asn_class = "unknown"
+    assert world.pick(TARGET) is None
+    set_setting("nodes_allow_unknown_class", "1")
+    try:
+        assert world.pick(TARGET) is session
+        session.asn_class = "datacenter"
+        assert world.pick(TARGET) is None
+    finally:
+        set_setting("nodes_allow_unknown_class", "0")
+
+
+def test_mobile_and_residential_are_eligible(world):
+    for index, asn_class in enumerate(("mobile", "residential")):
+        session = add(world, uid=f"c{index}", user=f"cu{index}")
+        session.asn_class = asn_class
+    assert len(world.candidates(TARGET)) == 2
+
+
+def test_an_admin_override_beats_the_class(world):
+    session = add(world)
+    session.asn_class = "datacenter"
+    session.class_override = "allow"
+    assert world.pick(TARGET) is session
+    session.class_override = ""
+    assert world.pick(TARGET) is None
+
+
+def test_class_refusals_are_counted(world):
+    session = add(world)
+    session.asn_class = "datacenter"
+    before = world.class_refusals
+    world.candidates(TARGET)
+    assert world.class_refusals > before