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/src/nisse_dev/dump.py

@@ -62,13 +62,14 @@ def render(path: Path, *, full: bool = False) -> str:
     active = agent["active_item"] if agent else None
     lines.append(f"active work item: {active or '(none: idle)'}")
     for item in conn.execute("SELECT * FROM work_items ORDER BY opened_at"):
-        data = json.loads(item["data"])
-        gate = data.get("gate") or {}
+        loop = json.loads(item["data"]).get("loop") or {}
         status = item["status"] + (f" ({item['outcome']})" if item["outcome"] else "")
+        waiting = (
+            f"  waits for: {loop['wait']}" if item["position"] == "WAITING" else ""
+        )
         lines.append(
             f"  {item['id']}  {status}  position: {item['position']}  "
-            f"scope: {item['scope']}  gate: "
-            + (f"{gate.get('name')} rev-{gate.get('rev')}" if gate else "none")
+            f"scope: {item['scope']}  rev-{loop.get('rev', 0)}{waiting}"
         )
     pending = conn.execute(
         "SELECT id, kind, payload, work_item FROM intent_log WHERE status = 'pending'"