refactor(src): Phase 10.2 batch 3 - project_manager + orchestrator_pm Result migration

project_manager.py (3 sites):
- get_all_tracks returns list[dict[str, Any]] where each dict now
  has an 'errors' field (list[ErrorInfo]) capturing per-track
  metadata recovery. The 3 SILENT_SWALLOW sites (state.from_dict,
  metadata.json, plan.md) now append to this list instead of
  silently passing.

orchestrator_pm.py (2 sites):
- get_track_history_summary returns Result[str]. The 2 SILENT_SWALLOW
  sites (metadata.json + spec.md reads) append to a scan_errors list
  that's threaded through the Result.

Tests updated to check result.ok and use result.data.

src/project_manager.py

@@ -332,16 +332,22 @@ def get_all_tracks(base_dir: Union[str, Path] = ".") -> list[dict[str, Any]]:
  and 'progress' (0.0 to 1.0).
  Handles missing or malformed metadata.json or state.toml by falling back
  to available info or defaults.
+ Each returned dict includes an 'errors' list (list[ErrorInfo]) for any
+ per-track metadata recovery that occurred. Callers can ignore the errors
+ field for display purposes; the metadata is best-effort.
+
  [C: tests/test_project_manager_tracks.py:test_get_all_tracks_empty, tests/test_project_manager_tracks.py:test_get_all_tracks_malformed, tests/test_project_manager_tracks.py:test_get_all_tracks_with_metadata_json, tests/test_project_manager_tracks.py:test_get_all_tracks_with_state, tests/test_project_paths.py:test_get_all_tracks_project_specific]
  """
  tracks_dir = paths.get_tracks_dir(project_path=str(base_dir))
  if not tracks_dir.exists(): return []
 
+ from src.result_types import ErrorInfo, ErrorKind
  results: list[dict[str, Any]] = []
  for entry in tracks_dir.iterdir():
   if not entry.is_dir(): continue
-  
+
   track_id = entry.name
+  track_errors: list[dict[str, Any]] = []
   track_info: dict[str, Any] = {
    "id":       track_id,
    "title":    track_id,
@@ -351,7 +357,7 @@ def get_all_tracks(base_dir: Union[str, Path] = ".") -> list[dict[str, Any]]:
    "progress": 0.0
   }
   state_found = False
-  
+
   try:
    state = load_track_state(track_id, base_dir)
    if state:
@@ -363,8 +369,8 @@ def get_all_tracks(base_dir: Union[str, Path] = ".") -> list[dict[str, Any]]:
     track_info["total"]    = progress["total"]
     track_info["progress"] = progress["percentage"] / 100.0
     state_found            = True
-  except (OSError, AttributeError, KeyError, TypeError):
-   pass
+  except (OSError, AttributeError, KeyError, TypeError) as e:
+   track_errors.append(ErrorInfo(kind=ErrorKind.INTERNAL, message=str(e), source=f"project_manager.get_all_tracks[{track_id}].state", original=e))
 
   if not state_found:
    metadata_file = entry / "metadata.json"
@@ -375,8 +381,8 @@ def get_all_tracks(base_dir: Union[str, Path] = ".") -> list[dict[str, Any]]:
       track_info["id"]     = data.get("id", data.get("track_id", track_id))
       track_info["title"]  = data.get("title", data.get("name", data.get("description", track_id)))
       track_info["status"] = data.get("status", "unknown")
-    except (OSError, json.JSONDecodeError, UnicodeDecodeError):
-     pass
+    except (OSError, json.JSONDecodeError, UnicodeDecodeError) as e:
+     track_errors.append(ErrorInfo(kind=ErrorKind.INTERNAL, message=str(e), source=f"project_manager.get_all_tracks[{track_id}].metadata", original=e))
 
   if track_info["total"] == 0:
    plan_file = entry / "plan.md"
@@ -390,9 +396,10 @@ def get_all_tracks(base_dir: Union[str, Path] = ".") -> list[dict[str, Any]]:
       track_info["complete"] = len(completed_tasks)
       if track_info["total"] > 0:
        track_info["progress"] = float(track_info["complete"]) / track_info["total"]
-    except (OSError, UnicodeDecodeError, re.error):
-     pass
-  
+    except (OSError, UnicodeDecodeError, re.error) as e:
+     track_errors.append(ErrorInfo(kind=ErrorKind.INTERNAL, message=str(e), source=f"project_manager.get_all_tracks[{track_id}].plan", original=e))
+
+  track_info["errors"] = track_errors
   results.append(track_info)
  return results