test(01-04): add matrix space regression coverage

- add MAT-01..MAT-07 and MAT-09..MAT-12 regression tests for matrix adapter
- extend store and dispatcher coverage for pending confirmations and settings dashboard
- verify matrix adapter suite and full pytest suite stay green

tests/adapter/matrix/test_invite_space.py

@@ -0,0 +1,78 @@
+from __future__ import annotations
+
+from types import SimpleNamespace
+from unittest.mock import AsyncMock
+
+from adapter.matrix.bot import build_runtime
+from adapter.matrix.handlers.auth import handle_invite
+from adapter.matrix.store import get_room_meta, get_user_meta
+from sdk.mock import MockPlatformClient
+
+
+def _make_client():
+    space_resp = SimpleNamespace(room_id="!space:example.org")
+    chat_resp = SimpleNamespace(room_id="!chat1:example.org")
+    return SimpleNamespace(
+        join=AsyncMock(),
+        room_create=AsyncMock(side_effect=[space_resp, chat_resp]),
+        room_put_state=AsyncMock(),
+        room_invite=AsyncMock(),
+        room_send=AsyncMock(),
+    )
+
+
+async def test_mat01_invite_creates_space_and_chat1():
+    runtime = build_runtime(platform=MockPlatformClient())
+    client = _make_client()
+    room = SimpleNamespace(room_id="!dm:example.org", display_name="Alice")
+    event = SimpleNamespace(sender="@alice:example.org", membership="invite")
+
+    await handle_invite(client, room, event, runtime.platform, runtime.store, runtime.auth_mgr)
+
+    first_call = client.room_create.call_args_list[0]
+    assert first_call.kwargs.get("space") is True
+    assert client.room_create.await_count == 2
+
+    client.room_put_state.assert_awaited_once()
+    kwargs = client.room_put_state.call_args.kwargs
+    assert kwargs.get("event_type") == "m.space.child"
+    assert kwargs.get("state_key") == "!chat1:example.org"
+    assert kwargs.get("room_id") == "!space:example.org"
+
+    user_meta = await get_user_meta(runtime.store, "@alice:example.org")
+    assert user_meta is not None
+    assert user_meta["space_id"] == "!space:example.org"
+
+    room_meta = await get_room_meta(runtime.store, "!chat1:example.org")
+    assert room_meta is not None
+    assert room_meta["chat_id"] == "C1"
+    assert room_meta["space_id"] == "!space:example.org"
+
+
+async def test_mat02_invite_idempotent():
+    runtime = build_runtime(platform=MockPlatformClient())
+    client = _make_client()
+    room = SimpleNamespace(room_id="!dm:example.org", display_name="Alice")
+    event = SimpleNamespace(sender="@alice:example.org", membership="invite")
+
+    await handle_invite(client, room, event, runtime.platform, runtime.store, runtime.auth_mgr)
+    await handle_invite(client, room, event, runtime.platform, runtime.store, runtime.auth_mgr)
+
+    assert client.room_create.await_count == 2
+
+
+async def test_mat03_no_hardcoded_c1():
+    runtime = build_runtime(platform=MockPlatformClient())
+    client = _make_client()
+    room = SimpleNamespace(room_id="!dm:example.org", display_name="Alice")
+    event = SimpleNamespace(sender="@alice:example.org", membership="invite")
+
+    await handle_invite(client, room, event, runtime.platform, runtime.store, runtime.auth_mgr)
+
+    room_meta = await get_room_meta(runtime.store, "!chat1:example.org")
+    assert room_meta is not None
+    assert room_meta["chat_id"] == "C1"
+
+    user_meta = await get_user_meta(runtime.store, "@alice:example.org")
+    assert user_meta is not None
+    assert user_meta["next_chat_index"] == 2