The new loop's core: intake, restatement, go-ahead, threads (M2.1, PR B)

nisse_dev.loop runs alongside control.py, chosen with `loop: new`.
Issues assigned to the agent (by an operator, or filed by one) become work
items, each with a Matrix thread. A driver run is one model with tools
until it calls a waiting tool: restate puts rev-N up for a go-ahead, bound
to the revision on screen when the reply arrived; ask_human waits for an
answer; close_item closes the item and its issue. Before the go-ahead the
driver can look but not change or close anything. One item is active at a
time; replies in an item's thread go to it. On boot, an item cut off
mid-run waits on the operator, and waiting points are put up again.

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

nisse-dev/tests/test_agent_build.py

@@ -374,3 +374,31 @@ def test_tuning_reaches_every_component(
     # tool_choice is asked of exactly the models LiteLLM declares enforce it.
     assert executor._client._enforces_tool_choice("claude-opus-5") is False
     agent.stop()
+
+
+def test_the_new_loop_assembles(tmp_path: Path, origin: Path, monkeypatch) -> None:
+    """`loop: new` builds the LoopAgent over the same services."""
+    from nisse_dev.loop.build import build_loop_agent
+
+    config = config_for(tmp_path, loop="new")
+    monkeypatch.setattr(
+        "nisse_dev.loop.build.GiteaClient.whoami", lambda self: "nisse-dev-testing"
+    )
+    monkeypatch.setattr(
+        "nisse_dev.loop.build.GiteaClient.clone_url", lambda self, repo: str(origin)
+    )
+    monkeypatch.setattr(
+        "nisse_dev.agent.ModelCatalog.discover",
+        classmethod(lambda cls, *a, **kw: TEST_CATALOG),
+    )
+    monkeypatch.setattr(
+        "nisse_dev.loop.build.MatrixTransport", lambda cfg: FakeTransport()
+    )
+    running = build_loop_agent(config)
+    try:
+        assert running.account == "nisse-dev-testing"
+        assert running.loop._repo == config.gitea_repo
+        assert (config.workspace / "README.md").exists()  # cloned on the build host
+    finally:
+        running.worker.call(running.store.close)
+        running.worker.stop(timeout=5)