Conversation on the new loop (M2.7)

- Questions never change state (L5, #77): a message ending in "?" to a
  waiting project item starts a question run (reply and look-only tools,
  an instruction to change nothing), and the item goes back to the very
  wait it was in: a restatement up stays up and a go binds to it; the
  agent's own question stays open.
- Explanations: a restatement gives its reasons and the main alternative;
  a revision says what changed (restate(changed), sent back without it);
  a milestone's summary says what was done, verified and left open.
- Progress in prose (#42): the driver's and a helper's own words for a
  turn are posted, trimmed, at most once a minute per item; `details`
  shows the last tool calls; a message arriving mid-run is acknowledged at
  once ("Noted; ...").
- CI: the e2e job's comments and the plan no longer claim a newer push
  cancels the run it supersedes (Gitea here doesn't); the concurrency
  block goes.

Tests: conversation unit tests (questions in a go-ahead and an answer wait,
an unanswerable question, revisions, progress rate and trimming, details,
mid-run notes), the helper's progress, the walk asking questions in every
state with a questions_change_nothing property (routing questions the old
way fails 32 of 48 seeds), and an e2e question while a restatement is up.

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

tests/integration/test_end_to_end_loop.py

@@ -634,3 +634,35 @@ def test_a_conversation_becomes_a_new_project(
         ]
         assert "ARCHITECTURE.md" in files, files
         assert any(f.startswith("docs/plans/") for f in files), files
+
+
+def test_a_question_leaves_the_restatement_up(
+    running: tuple[RunningLoop, InMemoryTransport, str],
+) -> None:
+    """M2.7: a question while a restatement is up is answered, and changes
+    nothing: the same revision stays up, and a go binds to it."""
+    agent, transport, run = running
+    operator = Operator(agent, transport)
+    repo = agent.config.gitea_repo
+    as_operator = operator_gitea(agent.config.gitea_url)
+    issues: list[int] = []
+    try:
+        issues.append(as_operator.create_issue(repo, f"vowels_{run}", task(run)))
+        as_operator._request(
+            "PATCH",
+            f"/repos/{repo}/issues/{issues[0]}",
+            json={"assignees": [agent.account]},
+        )
+        operator.tick()
+        item = operator.drive_until(GO_AHEAD, issues[0])
+        rev = loop_of(item).rev
+        said = len(transport.outbound)
+        operator.say("Why put it in that module rather than a new one?", issues[0])
+        answer = [m.text for m in transport.outbound[said:]]
+        assert answer and not answer[-1].startswith("rev-"), answer
+        loop = loop_of(operator.item(issues[0]))
+        assert (loop.wait, loop.rev) == (GO_AHEAD, rev), loop
+        operator.say("go", issues[0])
+        assert loop_of(operator.item(issues[0])).started
+    finally:
+        operator.tidy(issues, [])