Put work items in the state store, and bind the log to them (M1.1)

Development Plan M1.1, as discussed.

- Schema v4: a work_items table (id, scope, title, status, outcome,
  position, data) and an agent row whose active_item points at one
  (NULL: idle). Canonical events and intents carry their work item, and
  events their actor. Older stores are refused with a clear message:
  there was no production data, so no migration (the mechanism stays).
- The log is reached through a Transcript bound to one work item and
  one actor: store.transcript(item, actor) reads only that item and
  writes with both. The planner, executor, delegation and expert desk
  get one per call from the orchestrator instead of holding the store,
  so a component can neither read another task's events (the planner
  read every earlier task's, #78) nor write without attribution.
  store.all_events() is kept for readers that span items (evaluation
  capture, dumps). Intents are begun through the transcript or with
  work_item=, so each belongs to its item.
- The orchestrator opens a work item on 'use', closes it with its
  outcome (completed or abandoned), and carries what the operator said
  while idle into the new item as copies with their origin, so a task
  sent before 'use' is still planned from (D1). control.py keeps its
  state machine through get_state()/transition(), now over the active
  work item, until M2.6 retires it.
- nisse_dev.dump shows work items and each event's item and actor.

Tests: test_work_items.py (scoping, attribution, intent ownership,
restart, outcomes, carried messages, a second task never seeing the
first); the suites updated for the per-call transcript.

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

nisse-dev/tests/test_oplog.py

@@ -45,9 +45,9 @@ def test_transition_logs_from_to_and_cause(
 ) -> None:
     store.transition("PLANNING_ARCH", cause="operator command: use demo", project="d")
     store.transition("AWAIT_ARCH_SIGNOFF", cause="plan submitted", project="d")
-    first, second = events(stream)
-    assert first["event"] == "state.transition"
-    assert (first["from"], first["to"]) == (None, "PLANNING_ARCH")
+    # Opening the work item logs its own events first (work_item.open, .switch).
+    first, second = [e for e in events(stream) if e["event"] == "state.transition"]
+    assert (first["from"], first["to"]) == ("IDLE", "PLANNING_ARCH")
     assert (second["from"], second["to"]) == ("PLANNING_ARCH", "AWAIT_ARCH_SIGNOFF")
     assert second["cause"] == "plan submitted"
 
@@ -66,9 +66,9 @@ def test_task_id_threads_through_events(store: StateStore, stream: io.StringIO)
     store.transition("IDLE", cause="boot")
     store.oplog.task_id = "task-42"
     store.transition("PLANNING_ARCH", cause="operator command")
-    before, during = events(stream)
+    before, *during = events(stream)
     assert before["task_id"] is None
-    assert during["task_id"] == "task-42"
+    assert {e["task_id"] for e in during} == {"task-42"}
 
 
 def test_migration_emits_event(tmp_path: Path, stream: io.StringIO) -> None:
@@ -120,7 +120,10 @@ def test_literal_log_lines_for_human_readability(
     monkeypatch.setattr("nisse_dev.oplog.datetime", _FrozenDatetime)
 
     store.transition(
-        "PLANNING_ARCH", cause="operator command: use demo", project="demo"
+        "PLANNING_ARCH",
+        cause="operator command: use demo",
+        project="demo",
+        data={"task_id": "demo-m2"},
     )
     store.oplog.task_id = "demo-m2"
     intent_id = store.begin_intent(
@@ -129,11 +132,23 @@ def test_literal_log_lines_for_human_readability(
     store.commit_intent(intent_id, cause="push verified by Gitea query")
 
     assert stream.getvalue().splitlines() == [
+        (
+            '{"ts": "2026-09-05T12:00:00+00:00", "agent": "nisse-dev",'
+            ' "event": "work_item.open", "task_id": null,'
+            ' "cause": "operator command: use demo",'
+            ' "work_item": "demo-m2", "scope": "demo"}'
+        ),
+        (
+            '{"ts": "2026-09-05T12:00:00+00:00", "agent": "nisse-dev",'
+            ' "event": "work_item.switch", "task_id": null,'
+            ' "cause": "operator command: use demo",'
+            ' "from": null, "to": "demo-m2"}'
+        ),
         (
             '{"ts": "2026-09-05T12:00:00+00:00", "agent": "nisse-dev",'
             ' "event": "state.transition", "task_id": null,'
             ' "cause": "operator command: use demo",'
-            ' "from": null, "to": "PLANNING_ARCH", "project": "demo"}'
+            ' "from": "IDLE", "to": "PLANNING_ARCH", "project": "demo"}'
         ),
         (
             '{"ts": "2026-09-05T12:00:00+00:00", "agent": "nisse-dev",'