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_state.py

@@ -24,22 +24,25 @@ def test_fresh_store_stamps_schema_version(db: Path) -> None:
         assert store.schema_version == 1
 
 
-def test_transition_persists_across_reopen(db: Path) -> None:
+def test_a_work_item_persists_across_reopen(db: Path) -> None:
     with StateStore(db) as store:
-        store.transition(
-            "EXECUTING", cause="test", project="demo", data={"milestone": 2}
+        store.open_work_item(
+            "demo-1", title="t", scope="demo", position="WAITING", cause="test"
+        )
+        store.set_active("demo-1", cause="test")
+        store.update_work_item(
+            "demo-1", position="RUNNING", data={"milestone": 2}, cause="test"
         )
     with StateStore(db) as store:
-        state = store.get_state()
-    assert state is not None
-    assert state.state == "EXECUTING"
-    assert state.project == "demo"
-    assert state.data == {"milestone": 2}
+        item = store.active_item()
+    assert item is not None
+    assert (item.id, item.scope, item.position) == ("demo-1", "demo", "RUNNING")
+    assert item.data == {"milestone": 2}
 
 
-def test_get_state_on_fresh_store_is_none(db: Path) -> None:
+def test_a_fresh_store_has_no_active_item(db: Path) -> None:
     with StateStore(db) as store:
-        assert store.get_state() is None
+        assert store.active_item() is None
 
 
 def test_intent_lifecycle(db: Path) -> None: