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_loop_help.py

@@ -18,14 +18,20 @@ from test_loop_milestones import (
 )
 from test_loop_milestones import world as world  # noqa: PLC0414 -- the fixture
 
-from nisse_dev.canonical import AssistantText, Fact, ToolCall, ToolResult
+from nisse_dev.canonical import (
+    AssistantText,
+    DelegationStarted,
+    Fact,
+    ToolCall,
+    ToolResult,
+)
 from nisse_dev.config import Profile
 from nisse_dev.delegation import DELEGATION_INTENT, Caps
 from nisse_dev.llm import RoleMap
 from nisse_dev.loop.help import Helpers
 from nisse_dev.loop.items import ANSWER, MERGE, loop_of
 
-ROLES = RoleMap(executor="", planner="drv", helper="hlp", expert="exp", driver="drv")
+ROLES = RoleMap(driver="drv", helper="hlp", expert="exp")
 
 
 class Spy:
@@ -115,6 +121,34 @@ def test_a_helpers_work_lands_on_the_milestone(world: dict[str, Any]) -> None:
     assert loop_of(item(world)).wait == MERGE
 
 
+def test_a_delegation_records_what_the_alias_resolved_to(
+    world: dict[str, Any],
+) -> None:
+    # L9 eval history keyed on an alias alone would average across whatever
+    # that alias pointed at over time.
+    helper = Spy(
+        [call("write_file", path="helped.py", content="H = 1\n")], [hand_back()]
+    )
+    model = ScriptedModel(
+        RESTATE,
+        [
+            call("start_milestone", name="words"),
+            call("delegate", task="write helped.py"),
+            call("finish_milestone", summary="with help", final="yes"),
+        ],
+    )
+    backed = helpers(helper, backing=lambda alias: f"anthropic/{alias}-backing")
+    agent, transport = loop_agent(world, model, helpers=backed)
+    agent.intake()
+    say(transport, world, "go")
+    [started] = [
+        e.event
+        for e in world["store"].transcript(item(world).id, "helper").read()
+        if isinstance(e.event, DelegationStarted)
+    ]
+    assert started.backing_model == "anthropic/hlp-backing"
+
+
 def test_a_failed_helpers_work_is_discarded(world: dict[str, Any]) -> None:
     helper = Spy(
         [call("write_file", path="half.py", content="half\n")],