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_gitea.py

@@ -197,10 +197,7 @@ def test_intent_without_a_branch_is_unverifiable() -> None:
     assert pull_request_reconciler(client(handler), "o/r")(blank) is None
 
 
-def test_closing_comments_first_then_closes_issue_and_pr() -> None:
-    from nisse_dev.approvals import PlanBoard
-    from nisse_dev.publish import MilestonePublisher
-
+def test_closing_an_issue_and_a_pr() -> None:
     seen: list[tuple[str, str, dict]] = []
 
     def handler(request: httpx.Request) -> httpx.Response:
@@ -213,15 +210,10 @@ def test_closing_comments_first_then_closes_issue_and_pr() -> None:
         return httpx.Response(201, json={})
 
     gitea = client(handler)
-    PlanBoard(gitea, "o/r").close(10, "abandoned by don")
-    publisher = MilestonePublisher(
-        None,  # type: ignore[arg-type] -- closing touches neither store nor git
-        gitea,
-        "o/r",
-        None,  # type: ignore[arg-type]
-        remote_url="ssh://git@gitea.test/o/r.git",
-    )
-    publisher.close_pull_request(20, "abandoned by don")
+    gitea.post_comment("o/r", 10, "abandoned by don")
+    gitea.close_issue("o/r", 10)
+    gitea.post_comment("o/r", 20, "abandoned by don")
+    gitea.close_pull_request("o/r", 20)
 
     assert seen == [
         ("POST", "/api/v1/repos/o/r/issues/10/comments", {"body": "abandoned by don"}),