fix(tui): /resume picker shows telegram/discord/etc sessions

Reported during TUI v2 blitz retest: /resume modal only surfaced tui/cli
rows, even though `hermes --tui --resume <id>` with a pasted telegram
session id works fine.  The handler double-fetched with explicit
`source="tui"` and `source="cli"` filters and dropped everything else on
the floor.

Drop the filter — list_sessions_rich(source=None) already excludes
child sessions (subagents, compression continuations) via its default,
and users want to resume messenger sessions from inside the TUI.

Adds gateway regression coverage.

tests/gateway/test_session_list_all_sources.py

@@ -0,0 +1,84 @@
+"""Regression test for the TUI gateway's ``session.list`` handler.
+
+Reported during the TUI v2 blitz retest: the ``/resume`` modal inside a
+TUI session only surfaced ``tui``/``cli`` rows — telegram/discord/whatsapp
+sessions stayed hidden even though the user could still paste the id
+directly into ``hermes --tui --resume <id>`` and get a working session.
+
+The fix removes the adapter-kind filter so every session the DB surfaces
+appears in the picker, sorted by ``started_at`` like before.
+"""
+
+from __future__ import annotations
+
+import types
+
+from tui_gateway import server
+
+
+class _StubDB:
+    def __init__(self, rows):
+        self.rows = rows
+        self.calls: list[dict] = []
+
+    def list_sessions_rich(self, **kwargs):
+        self.calls.append(kwargs)
+        return list(self.rows)
+
+
+def _call(limit: int = 20):
+    return server.handle_request({
+        "id": "1",
+        "method": "session.list",
+        "params": {"limit": limit},
+    })
+
+
+def test_session_list_does_not_filter_by_source(monkeypatch):
+    rows = [
+        {"id": "tui-1", "source": "tui", "title": "a", "preview": "", "started_at": 3, "message_count": 1},
+        {"id": "tg-1", "source": "telegram", "title": "b", "preview": "", "started_at": 2, "message_count": 1},
+        {"id": "cli-1", "source": "cli", "title": "c", "preview": "", "started_at": 1, "message_count": 1},
+    ]
+    db = _StubDB(rows)
+    monkeypatch.setattr(server, "_get_db", lambda: db)
+
+    resp = _call(limit=10)
+
+    assert "result" in resp, resp
+    assert len(db.calls) == 1
+    assert db.calls[0].get("source") is None, db.calls[0]
+    assert db.calls[0].get("limit") == 10
+
+    kinds = [s["source"] for s in resp["result"]["sessions"]]
+    assert "telegram" in kinds and "tui" in kinds and "cli" in kinds, kinds
+
+
+def test_session_list_preserves_ordering(monkeypatch):
+    rows = [
+        {"id": "newest", "source": "telegram", "title": "", "preview": "", "started_at": 5, "message_count": 1},
+        {"id": "middle", "source": "tui", "title": "", "preview": "", "started_at": 3, "message_count": 1},
+        {"id": "oldest", "source": "discord", "title": "", "preview": "", "started_at": 1, "message_count": 1},
+    ]
+    monkeypatch.setattr(server, "_get_db", lambda: _StubDB(rows))
+
+    resp = _call()
+    ids = [s["id"] for s in resp["result"]["sessions"]]
+
+    assert ids == ["newest", "middle", "oldest"]
+
+
+def test_session_list_surfaces_missing_fields_as_empty(monkeypatch):
+    rows = [{"id": "bare", "source": "whatsapp"}]
+    monkeypatch.setattr(server, "_get_db", lambda: _StubDB(rows))
+
+    sess = _call()["result"]["sessions"][0]
+
+    assert sess == {
+        "id": "bare",
+        "title": "",
+        "preview": "",
+        "started_at": 0,
+        "message_count": 0,
+        "source": "whatsapp",
+    }