M2.8: switch over to the new loop

nisse-dev now runs only the conversational loop. The gated state machine
it was built alongside is gone:

- Removed control.py, planner.py, executor.py, approvals.py, gates.py
  (command_form moves to loop/reader.py), publish.py and poller.py, the
  old assembly in agent.py (its shared helpers move to loop/build.py),
  the store's state-machine view (get_state, transition), their tests,
  the old end-to-end and live planning/milestone/gate tests, and
  specs/orchestrator.qnt with its scenarios.
- Roles are driver, helper, expert and classifier; driver is required.
  loop:, roles.planner, roles.executor and tuning.executor are refused
  with what to use instead; tuning.driver takes the turn cap and failure
  limit.
- The benchmark and the capability matrix measure the driver: the
  loop's own system prompt and tools, the task's plan as the agreed
  restatement. Task plans end with finish_milestone, so earlier runs
  show as (old); stored runs' executor tuning reads as the driver's.
- A delegation on the loop records what its helper's alias resolved to
  (L9), as the old path's did.
- The dump shows a work item's revision and what it waits for.
- Behaviour the old tests covered and the loop shares stays covered:
  driver runs that fail on a model call, stop mid-turn, reset the
  failure count; go-aheads ignoring case and punctuation; a request too
  big to fit is never sent; the assembly tests, now on build_loop_agent.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPQ14L3LikyefCMFBqEbKE

nisse-dev/tests/test_oplog.py

@@ -29,10 +29,21 @@ def events(stream: io.StringIO) -> list[dict]:
     return [json.loads(line) for line in stream.getvalue().splitlines()]
 
 
+def start_item(
+    store: StateStore, item_id: str, *, scope: str | None = None, cause: str
+) -> None:
+    """Open a work item, make it the active one and set it running."""
+    store.open_work_item(
+        item_id, title=item_id, scope=scope, position="IDLE", cause=cause
+    )
+    store.set_active(item_id, cause=cause)
+    store.update_work_item(item_id, position="RUNNING", data={}, cause=cause)
+
+
 def test_every_event_carries_the_envelope(
     store: StateStore, stream: io.StringIO
 ) -> None:
-    store.transition("PLANNING_ARCH", cause="operator command: use demo")
+    start_item(store, "demo-1", cause="issue assigned")
     intent_id = store.begin_intent("push_branch", {}, cause="milestone execution")
     store.commit_intent(intent_id, cause="push verified")
     for event in events(stream):
@@ -40,16 +51,20 @@ def test_every_event_carries_the_envelope(
         assert event["agent"] == "nisse-dev"
 
 
-def test_transition_logs_from_to_and_cause(
+def test_a_position_change_logs_from_to_and_cause(
     store: StateStore, stream: io.StringIO
 ) -> None:
-    store.transition("PLANNING_ARCH", cause="operator command: use demo", project="d")
-    store.transition("AWAIT_ARCH_SIGNOFF", cause="plan submitted", project="d")
+    start_item(store, "d-1", scope="d", cause="issue assigned")
+    store.update_work_item("d-1", position="WAITING", data={}, cause="restated")
     # Opening the work item logs its own events first (work_item.open, .switch).
     first, second = [e for e in events(stream) if e["event"] == "state.transition"]
-    assert (first["from"], first["to"]) == ("IDLE", "PLANNING_ARCH")
-    assert (second["from"], second["to"]) == ("PLANNING_ARCH", "AWAIT_ARCH_SIGNOFF")
-    assert second["cause"] == "plan submitted"
+    assert (first["from"], first["to"]) == ("IDLE", "RUNNING")
+    assert (second["from"], second["to"], second["project"]) == (
+        "RUNNING",
+        "WAITING",
+        "d",
+    )
+    assert second["cause"] == "restated"
 
 
 def test_intent_lifecycle_events(store: StateStore, stream: io.StringIO) -> None:
@@ -63,9 +78,9 @@ def test_intent_lifecycle_events(store: StateStore, stream: io.StringIO) -> None
 
 
 def test_task_id_threads_through_events(store: StateStore, stream: io.StringIO) -> None:
-    store.transition("IDLE", cause="boot")
+    store.open_work_item("general", title="general", position="IDLE", cause="boot")
     store.oplog.task_id = "task-42"
-    store.transition("PLANNING_ARCH", cause="operator command")
+    start_item(store, "task-42", cause="issue assigned")
     before, *during = events(stream)
     assert before["task_id"] is None
     assert {e["task_id"] for e in during} == {"task-42"}
@@ -119,12 +134,7 @@ def test_literal_log_lines_for_human_readability(
 
     monkeypatch.setattr("nisse_dev.oplog.datetime", _FrozenDatetime)
 
-    store.transition(
-        "PLANNING_ARCH",
-        cause="operator command: use demo",
-        project="demo",
-        data={"task_id": "demo-m2"},
-    )
+    start_item(store, "demo-m2", scope="demo", cause="issue assigned: demo#2")
     store.oplog.task_id = "demo-m2"
     intent_id = store.begin_intent(
         "push_branch", {"branch": "milestone-2"}, cause="milestone 2 execution"
@@ -135,20 +145,20 @@ def test_literal_log_lines_for_human_readability(
         (
             '{"ts": "2026-09-05T12:00:00+00:00", "agent": "nisse-dev",'
             ' "event": "work_item.open", "task_id": null,'
-            ' "cause": "operator command: use demo",'
+            ' "cause": "issue assigned: demo#2",'
             ' "work_item": "demo-m2", "scope": "demo"}'
         ),
         (
             '{"ts": "2026-09-05T12:00:00+00:00", "agent": "nisse-dev",'
             ' "event": "work_item.switch", "task_id": null,'
-            ' "cause": "operator command: use demo",'
+            ' "cause": "issue assigned: demo#2",'
             ' "from": null, "to": "demo-m2"}'
         ),
         (
             '{"ts": "2026-09-05T12:00:00+00:00", "agent": "nisse-dev",'
             ' "event": "state.transition", "task_id": null,'
-            ' "cause": "operator command: use demo",'
-            ' "from": "IDLE", "to": "PLANNING_ARCH", "project": "demo"}'
+            ' "cause": "issue assigned: demo#2",'
+            ' "from": "IDLE", "to": "RUNNING", "project": "demo"}'
         ),
         (
             '{"ts": "2026-09-05T12:00:00+00:00", "agent": "nisse-dev",'