M7.1: extract nisse-core

What isn't the dev agent's moves to nisse-core, unchanged in behaviour,
with its tests: canonical, render, render_anthropic, llm, catalog, probe,
context, views, state, reconcile, worker, cancel, dump, transport, matrix,
execution, testing, vault, memory, oplog, envfile and gitea (whole).

- nisse_core.state.StateStore holds the tables every agent has; an
  agent's subclass adds its tables (version, migrations), roles and
  views. nisse_dev.state.StateStore adds the build VM blocks (v5).
- views.project takes what each role is shown, rather than a fixed table.
- Vault takes the agent's name (agent=), for provenance.
- A test that nisse_core never imports an agent.
- The loop, config, git, delegation, expert, tools and evals stay in
  nisse-dev until nisse-ops has a loop to share.

Docs: the Development Plan marks M7.1 done and notes that Phase 6 waits on
the agent host and Terraform; Architecture Part L names the package.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01J5Utyfzw7gF7UhjRDEtjTk

nisse-core/tests/test_state.py

@@ -0,0 +1,123 @@
+import sqlite3
+from pathlib import Path
+
+import pytest
+
+from nisse_core.state import StateSchemaError, StateStore
+
+
+@pytest.fixture
+def db(tmp_path: Path) -> Path:
+    return tmp_path / "state.db"
+
+
+def test_wal_mode_and_full_sync(db: Path) -> None:
+    with StateStore(db) as store:
+        journal = store._conn.execute("PRAGMA journal_mode").fetchone()[0]
+        sync = store._conn.execute("PRAGMA synchronous").fetchone()[0]
+    assert journal == "wal"
+    assert sync == 2  # FULL
+
+
+def test_fresh_store_stamps_schema_version(db: Path) -> None:
+    with StateStore(db, schema_version=1) as store:
+        assert store.schema_version == 1
+
+
+def test_a_work_item_persists_across_reopen(db: Path) -> None:
+    with StateStore(db) as store:
+        store.open_work_item(
+            "demo-1", title="t", scope="demo", position="WAITING", cause="test"
+        )
+        store.set_active("demo-1", cause="test")
+        store.update_work_item(
+            "demo-1", position="RUNNING", data={"milestone": 2}, cause="test"
+        )
+    with StateStore(db) as store:
+        item = store.active_item()
+    assert item is not None
+    assert (item.id, item.scope, item.position) == ("demo-1", "demo", "RUNNING")
+    assert item.data == {"milestone": 2}
+
+
+def test_a_fresh_store_has_no_active_item(db: Path) -> None:
+    with StateStore(db) as store:
+        assert store.active_item() is None
+
+
+def test_intent_lifecycle(db: Path) -> None:
+    with StateStore(db) as store:
+        intent_id = store.begin_intent("push_branch", {"branch": "m2"}, cause="test")
+        [pending] = store.pending_intents()
+        assert pending.id == intent_id
+        assert pending.kind == "push_branch"
+        assert pending.payload == {"branch": "m2"}
+        store.commit_intent(intent_id, cause="test")
+        assert store.pending_intents() == []
+
+
+def test_pending_intent_survives_reopen(db: Path) -> None:
+    with StateStore(db) as store:
+        store.begin_intent("open_pr", {"title": "hello"}, cause="test")
+    with StateStore(db) as store:
+        [pending] = store.pending_intents()
+    assert pending.kind == "open_pr"
+
+
+def test_aborted_intent_is_not_pending(db: Path) -> None:
+    with StateStore(db) as store:
+        intent_id = store.begin_intent("push_branch", {}, cause="test")
+        store.abort_intent(intent_id, cause="test")
+        assert store.pending_intents() == []
+
+
+def test_resolving_nonpending_intent_raises(db: Path) -> None:
+    with StateStore(db) as store:
+        intent_id = store.begin_intent("push_branch", {}, cause="test")
+        store.commit_intent(intent_id, cause="test")
+        with pytest.raises(KeyError):
+            store.commit_intent(intent_id, cause="test")
+        with pytest.raises(KeyError):
+            store.abort_intent(9999, cause="test")
+
+
+def test_migration_runs_and_bumps_version(db: Path) -> None:
+    with StateStore(db, schema_version=1):
+        pass
+
+    def add_notes_table(conn: sqlite3.Connection) -> None:
+        conn.execute("CREATE TABLE notes (id INTEGER PRIMARY KEY, body TEXT)")
+
+    with StateStore(db, schema_version=2, migrations={1: add_notes_table}) as store:
+        assert store.schema_version == 2
+        store._conn.execute("SELECT * FROM notes")
+
+
+def test_missing_migration_raises(db: Path) -> None:
+    with StateStore(db, schema_version=1):
+        pass
+    with pytest.raises(StateSchemaError, match="no migration"):
+        StateStore(db, schema_version=2, migrations={})
+
+
+def test_failed_migration_leaves_version_unchanged(db: Path) -> None:
+    with StateStore(db, schema_version=1):
+        pass
+
+    def broken(conn: sqlite3.Connection) -> None:
+        conn.execute("CREATE TABLE notes (id INTEGER PRIMARY KEY)")
+        raise RuntimeError("boom")
+
+    with pytest.raises(RuntimeError, match="boom"):
+        StateStore(db, schema_version=2, migrations={1: broken})
+    with StateStore(db, schema_version=1) as store:
+        assert store.schema_version == 1
+        with pytest.raises(sqlite3.OperationalError):
+            store._conn.execute("SELECT * FROM notes")
+
+
+def test_newer_schema_is_refused(db: Path) -> None:
+    with StateStore(db, schema_version=3):
+        pass
+    with pytest.raises(StateSchemaError, match="newer"):
+        StateStore(db, schema_version=1)