feat: plan agent v2, global chat mode, and user-mode v2 flag sync

- Add runtime/plan_agent_v2 package and shims; gateway/direct_loop/WS wiring

- Admin chat: interaction mode and specialist only in user menu; session API stores memory_mode and execution_mode only

- POST /admin/api/chat/user-mode mirrors plan_agent_version to AIA_EXPERT_PLAN_AGENT_V2_ENABLED (v2 to 1, v1 to 0)

- Composer cleanup (hidden mode select, no reasoning toggle in meta bar); tests and _local/system.env.example

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/test_bootstrap_env.py

@@ -0,0 +1,48 @@
+from __future__ import annotations
+
+import os
+from pathlib import Path
+
+import pytest
+
+from oclaw.platform.config import bootstrap_env as be
+
+
+@pytest.fixture(autouse=True)
+def _reset_bootstrap_flag():
+    be._LOADED = False
+    yield
+    be._LOADED = False
+
+
+def test_load_system_env_reads_only_local_system_env(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.setattr(be, "_project_root", lambda: tmp_path)
+    loc = tmp_path / "_local"
+    loc.mkdir(parents=True, exist_ok=True)
+    (loc / "system.env").write_text("X=only_file\nY=z\n", encoding="utf-8")
+    monkeypatch.delenv("X", raising=False)
+    monkeypatch.delenv("Y", raising=False)
+
+    loaded = be.load_system_env(force=True)
+    assert len(loaded) == 1
+    assert os.environ["X"] == "only_file"
+    assert os.environ["Y"] == "z"
+
+
+def test_load_system_env_does_not_override_process_env(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.setattr(be, "_project_root", lambda: tmp_path)
+    loc = tmp_path / "_local"
+    loc.mkdir(parents=True, exist_ok=True)
+    (loc / "system.env").write_text("X=from_file\n", encoding="utf-8")
+    monkeypatch.setenv("X", "from_shell")
+
+    be.load_system_env(force=True)
+    assert os.environ["X"] == "from_shell"
+
+
+def test_load_system_env_missing_file_noop(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.setattr(be, "_project_root", lambda: tmp_path)
+    (tmp_path / "_local").mkdir(parents=True, exist_ok=True)
+
+    loaded = be.load_system_env(force=True)
+    assert loaded == []