refactor: LangGraph gateway layer for UI-agnostic graph and thread access (#295)

* feat(gateway): graph gateway protocol

* refactor(cli): wire gateway in cli/tui

* refactor(gateway): centralize runtime gateway init

* chore(gateway): restrict RunRequest message type

* feat(gateway): add langgraph server gateway

* chore(cli): tighten serve runtime state typing

* refactor(cli): route async task state reads through graph gateway

* refactor(gateway): support graph targets in server gateway

* refactor(cli): route session commands through graph gateway

* refactor(cli): fold thread store under graph gateway

* refactor(gateway): route graph state access through gateway

* refactor(channels): wire graph gateway

* refactor(memory): preserve graph threads for cloning

* feat(gateway): add thread cloning

* fix(tui): pass effective workspace for thread creation

* chore(memory): add workspare dir to memory worker metadata

* fix(sessions): filter preloaded UUID registy entries by the current scope

* test(fakes): use https

* refactor(consumer): consolidate imports

* fix(stream): optional summarization event

* fix(gateway): resolve abbreviated thread IDs by search

* fix(gateway): page server thread listings

* fix(gateway): emit pending interrupt events

* style: fmt

* feat(gateway): persist workspace_dir & model in thread metadata

* fix(gateway): page server thread prefix resolution

* fix(gateway): expose server thread list metadata

* refactor: add back type def

* refactor: tighten types

* revert: add back worker thread deletion

The worker thread forking changes are out of scope for now, so to
maintain parity with the existing behavior we'll leave this intact.

* fix(gateway): apply compaction to server thread history

* refactor(stream): restore direct summary replay suppression

* fix(gateway): preserve compaction state and server stream output

* fix(gateway): close local stream generator on cancellation

---------

Co-authored-by: Xi Zhang <106144707+X-iZhang@users.noreply.github.com>

tests/test_ui_runtime.py

@@ -7,6 +7,7 @@ from EvoScientist.cli.tui_runtime import (
     resolve_ui_backend,
     run_streaming,
 )
+from tests.fakes import FakeGraphGateway
 
 
 def test_normalize_ui_backend_defaults_to_cli():
@@ -73,5 +74,6 @@ def test_run_streaming_falls_back_to_cli_on_runtime_error(monkeypatch):
         thread_id="t1",
         show_thinking=False,
         interactive=True,
+        gateway=FakeGraphGateway(),
     )
     assert result == "fallback-ok"