chore: unit tests adaption to idea of gate test

for chat

.claude/projects/-Users-gb-Projects-bDS2/memory/MEMORY.md

@@ -1 +1,2 @@
-- [Fix all test failures](feedback_fix_all_failures.md) — Never dismiss failures as pre-existing; fix everything
+- [Fix all test failures](feedback_fix_all_failures.md) — Never dismiss failures as pre-existing or flaky; investigate and fix
+- [Debug targeted](feedback_targeted_debugging.md) — Analyze the code and fix; don't brute-force with repeated suite runs

.claude/projects/-Users-gb-Projects-bDS2/memory/feedback_fix_all_failures.md

@@ -1,11 +1,13 @@
 ---
-name: Fix all test failures
-description: Never dismiss test failures as pre-existing — if tests fail after changes, fix them
+name: Fix all test failures including flaky ones
+description: Never dismiss test failures as pre-existing or flaky — investigate root cause and stabilize
 type: feedback
 ---
 
-All test failures after changes must be fixed, even if they appear unrelated. The test suite was clean before, so any failure is the responsibility of the current change.
+All test failures must be fixed, even if they appear unrelated to current changes. The test suite was clean before, so any failure is my responsibility.
 
-**Why:** The user confirmed the suite was green before. Dismissing failures as "pre-existing" is wrong and wastes time.
+Flaky tests are deeper problems waiting to surface. Running a test in isolation and seeing it pass is never enough — must find out why it was flaky in the full suite run and make it stable.
 
-**How to apply:** After making changes, if any test fails, investigate and fix it before reporting the task as done. Never stash/skip/ignore failures.
+**Why:** Dismissing failures as "pre-existing" or "flaky" is wrong. Flaky tests indicate real issues (race conditions, test pollution, shared state) that will bite harder later.
+
+**How to apply:** After making changes, if any test fails: investigate the root cause, fix it, and verify it passes reliably in the full suite. Never stash, never skip, never re-run and hope. Never dismiss ordering-dependent failures — find and fix the shared state or race condition.

.claude/projects/-Users-gb-Projects-bDS2/memory/feedback_targeted_debugging.md

@@ -0,0 +1,11 @@
+---
+name: Debug targeted, don't brute-force
+description: When investigating flaky tests, analyze the code and fix — don't brute-force with repeated full suite runs
+type: feedback
+---
+
+If you already know which test is failing and why, fix it. Don't waste time running the full suite 20 times hoping to capture output.
+
+**Why:** It's slow, wasteful, and avoids thinking. Analyze the code, understand the race, fix it.
+
+**How to apply:** When a test fails, read the test, understand what it does, identify the root cause, and fix it. Only re-run to verify the fix, not to gather more data you already have.

.claude/settings.local.json

@@ -6,7 +6,8 @@
       "Bash(mix dialyzer *)",
       "Bash(mix ecto.migrate)",
       "Bash(git add *)",
-      "Bash(git push *)"
+      "Bash(git push *)",
+      "Bash(git -C /Users/gb/Projects/bDS2 status)"
     ]
   }
 }

test/bds/desktop/shell_live_test.exs

@@ -443,15 +443,27 @@ defmodule BDS.Desktop.ShellLiveTest do
     def get(_url, _headers), do: {:error, :not_found}
   end
 
-  defmodule DelayedChatServer do
+  defmodule GatedChatServer do
+    @moduledoc false
     use Plug.Router
     import Phoenix.ConnTest, except: [post: 2]
 
     plug(:match)
     plug(:dispatch)
 
+    def hold_gate do
+      case GenServer.whereis(__MODULE__) do
+        nil -> :ok
+        pid -> Agent.stop(pid)
+      end
+
+      Agent.start_link(fn -> :hold end, name: __MODULE__)
+    end
+
+    def release_gate, do: Agent.update(__MODULE__, fn _ -> :release end)
+
     post "/v1/chat/completions" do
-      Process.sleep(300)
+      wait_for_release()
 
       body =
         Jason.encode!(%{
@@ -467,6 +479,19 @@ defmodule BDS.Desktop.ShellLiveTest do
     match _ do
       send_resp(conn, 404, "not found")
     end
+
+    defp wait_for_release do
+      case GenServer.whereis(__MODULE__) do
+        nil ->
+          Process.sleep(:infinity)
+
+        _pid ->
+          case Agent.get(__MODULE__, & &1) do
+            :release -> :ok
+            :hold -> Process.sleep(50) && wait_for_release()
+          end
+      end
+    end
   end
 
   defmodule TitleChatServer do
@@ -3915,9 +3940,10 @@ defmodule BDS.Desktop.ShellLiveTest do
 
   test "chat editor keeps previous surfaces visible while a new update surface streams" do
     assert :ok = AI.set_airplane_mode(false)
+    {:ok, _} = GatedChatServer.hold_gate()
 
     server =
-      start_supervised!({Bandit, plug: DelayedChatServer, port: 0, startup_log: false})
+      start_supervised!({Bandit, plug: GatedChatServer, port: 0, startup_log: false})
 
     {:ok, {_address, port}} = ThousandIsland.listener_info(server)
 
@@ -4000,8 +4026,6 @@ defmodule BDS.Desktop.ShellLiveTest do
       view
       |> element("[data-testid='chat-abort-button']")
       |> render_click()
-
-    Process.sleep(350)
   end
 
   test "chat editor hook reopens server-expanded A2UI surfaces after patches" do
@@ -4356,9 +4380,10 @@ defmodule BDS.Desktop.ShellLiveTest do
 
   test "chat editor shows in-flight stop state and can abort a running turn" do
     assert :ok = AI.set_airplane_mode(false)
+    {:ok, _} = GatedChatServer.hold_gate()
 
     server =
-      start_supervised!({Bandit, plug: DelayedChatServer, port: 0, startup_log: false})
+      start_supervised!({Bandit, plug: GatedChatServer, port: 0, startup_log: false})
 
     {:ok, {_address, port}} = ThousandIsland.listener_info(server)
 
@@ -4401,15 +4426,17 @@ defmodule BDS.Desktop.ShellLiveTest do
 
     refute html =~ ~s(data-testid="chat-abort-button")
 
-    Process.sleep(350)
+    GatedChatServer.release_gate()
+    Process.sleep(100)
     refute render(view) =~ "Delayed response"
   end
 
   test "chat editor keeps the in-flight user turn visible and disables input while streaming" do
     assert :ok = AI.set_airplane_mode(false)
+    {:ok, _} = GatedChatServer.hold_gate()
 
     server =
-      start_supervised!({Bandit, plug: DelayedChatServer, port: 0, startup_log: false})
+      start_supervised!({Bandit, plug: GatedChatServer, port: 0, startup_log: false})
 
     {:ok, {_address, port}} = ThousandIsland.listener_info(server)
 
@@ -4483,15 +4510,17 @@ defmodule BDS.Desktop.ShellLiveTest do
 
     refute html =~ ~s(data-testid="chat-abort-button")
 
-    Process.sleep(350)
+    GatedChatServer.release_gate()
+    Process.sleep(100)
     refute render(view) =~ "Delayed response"
   end
 
   test "chat editor does not duplicate persisted turn artifacts while the request is still active" do
     assert :ok = AI.set_airplane_mode(false)
+    {:ok, _} = GatedChatServer.hold_gate()
 
     server =
-      start_supervised!({Bandit, plug: DelayedChatServer, port: 0, startup_log: false})
+      start_supervised!({Bandit, plug: GatedChatServer, port: 0, startup_log: false})
 
     {:ok, {_address, port}} = ThousandIsland.listener_info(server)
 
@@ -4575,8 +4604,6 @@ defmodule BDS.Desktop.ShellLiveTest do
       view
       |> element("[data-testid='chat-abort-button']")
       |> render_click()
-
-    Process.sleep(350)
   end
 
   test "translation validation route renders dedicated cards and fix controls", %{

tmp/BDS.TOCTOU.FileSystemTest/test-read_template_file-2-protocol-uses-atomic-read-reads-existing-template-0fbdd3d0/footer.liquid

@@ -0,0 +1 @@
+FOOTER

tmp/BDS.TOCTOU.FileSystemTest/test-try_read-2-eliminates-TOCTOU-race-falls-through-to-next-root-path-when-first-is-missing-ac96bedd/b/partial.liquid

@@ -0,0 +1 @@
+FROM B

tmp/BDS.TOCTOU.FileSystemTest/test-try_read-2-eliminates-TOCTOU-race-first-root-path-wins-when-both-have-the-template-69386ef3/a/shared.liquid

@@ -0,0 +1 @@
+FROM A

tmp/BDS.TOCTOU.FileSystemTest/test-try_read-2-eliminates-TOCTOU-race-first-root-path-wins-when-both-have-the-template-69386ef3/b/shared.liquid

@@ -0,0 +1 @@
+FROM B

tmp/BDS.TOCTOU.FileSystemTest/test-try_read-2-eliminates-TOCTOU-race-reads-file-atomically-without-separate-existence-check-8a97013f/header.liquid

@@ -0,0 +1 @@
+HEADER CONTENT