feat(api_hook_client): add wait_for_project_switch for deterministic test waits

Adds a polling helper that blocks until the project switch completes,
errors out, or times out. Replaces the fragile 10x1s blind poll in
test_full_live_workflow with a condition-based wait on the
/api/project_switch_status endpoint.

Features:
- Polls /api/project_switch_status every 200ms (configurable)
- Returns immediately on error (with the error in the result)
- Path matching: exact match OR basename match (handles absolute vs relative)
- Times out with a clear 'timeout' flag instead of a generic assertion
- Optional expected_path: if None, returns on any in_progress=False

- src/api_hook_client.py: new wait_for_project_switch method (37 lines)
- tests/test_api_hook_client_wait_for_project_switch.py: 6 unit tests
  with mocked _make_request covering all paths

tests/test_api_hook_client_wait_for_project_switch.py

@@ -0,0 +1,91 @@
+"""Tests for ApiHookClient.wait_for_project_switch.
+
+These tests use mocked _make_request so they don't require a live_gui
+session. They verify the polling logic: success, error, timeout, and
+path-matching behavior.
+"""
+import sys
+import os
+import time
+from unittest.mock import patch
+
+sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))
+
+from src.api_hook_client import ApiHookClient
+
+
+def test_wait_for_project_switch_returns_immediately_when_idle() -> None:
+ """If the controller is already idle and path matches, return immediately."""
+ client = ApiHookClient()
+ with patch.object(client, "_make_request") as mock_make:
+  mock_make.return_value = {"in_progress": False, "path": "C:/projects/foo.toml", "error": None}
+  start = time.time()
+  result = client.wait_for_project_switch(expected_path="C:/projects/foo.toml", timeout=5.0)
+  elapsed = time.time() - start
+  assert result["in_progress"] is False
+  assert result["path"] == "C:/projects/foo.toml"
+  assert result.get("error") is None
+  assert "timeout" not in result
+  assert elapsed < 1.0, f"should return quickly, took {elapsed}s"
+
+
+def test_wait_for_project_switch_surfaces_error() -> None:
+ """If the controller reports an error, return immediately with the error."""
+ client = ApiHookClient()
+ with patch.object(client, "_make_request") as mock_make:
+  mock_make.return_value = {"in_progress": False, "path": None, "error": "load failed: file not found"}
+  result = client.wait_for_project_switch(expected_path="C:/missing.toml", timeout=5.0)
+  assert result["error"] == "load failed: file not found"
+  assert "timeout" not in result
+
+
+def test_wait_for_project_switch_matches_by_basename() -> None:
+ """Path matching is loose: matches by basename to handle absolute vs relative."""
+ client = ApiHookClient()
+ with patch.object(client, "_make_request") as mock_make:
+  mock_make.return_value = {"in_progress": False, "path": "C:/abs/path/temp_project.toml", "error": None}
+  result = client.wait_for_project_switch(
+   expected_path="tests/artifacts/temp_project.toml",
+   timeout=5.0,
+  )
+  assert result["path"].endswith("temp_project.toml")
+  assert "timeout" not in result
+
+
+def test_wait_for_project_switch_times_out_when_in_progress() -> None:
+ """If the controller stays in_progress past the timeout, return with timeout flag."""
+ client = ApiHookClient()
+ with patch.object(client, "_make_request") as mock_make:
+  mock_make.return_value = {"in_progress": True, "path": None, "error": None}
+  result = client.wait_for_project_switch(expected_path="C:/foo.toml", timeout=0.5, poll_interval=0.1)
+  assert result.get("timeout") is True
+  assert result["in_progress"] is True
+
+
+def test_wait_for_project_switch_no_expected_path() -> None:
+ """If expected_path is None, return when in_progress becomes False (any path)."""
+ client = ApiHookClient()
+ with patch.object(client, "_make_request") as mock_make:
+  mock_make.return_value = {"in_progress": False, "path": "C:/anything.toml", "error": None}
+  result = client.wait_for_project_switch(expected_path=None, timeout=5.0)
+  assert result["in_progress"] is False
+  assert "timeout" not in result
+
+
+def test_wait_for_project_switch_polls_then_completes() -> None:
+ """Simulate a switch that takes 2 polls to complete."""
+ client = ApiHookClient()
+ call_count = [0]
+
+ def fake_request(*args, **kwargs):
+  call_count[0] += 1
+  if call_count[0] < 3:
+   return {"in_progress": True, "path": None, "error": None}
+  return {"in_progress": False, "path": "C:/foo.toml", "error": None}
+
+ with patch.object(client, "_make_request", side_effect=fake_request):
+  result = client.wait_for_project_switch(expected_path="C:/foo.toml", timeout=5.0, poll_interval=0.05)
+  assert result["in_progress"] is False
+  assert result["path"] == "C:/foo.toml"
+  assert "timeout" not in result
+  assert call_count[0] >= 3