refactor(workspace_manager): merge WorkspaceProfile from models.py into workspace_manager.py

Per the 4-criteria decision rule: WorkspaceProfile fails C1 (only used
by the workspace subsystem), fails C2 (no state machine), fails C3 (no
dedicated test file), borderline C4. MERGE into the existing
src/workspace_manager.py which already has WorkspaceManager.

This commit:
 1. Adds WorkspaceProfile class definition to src/workspace_manager.py
    at the top.
 2. Removes the same class def from src/models.py.
 3. Adds lazy re-export via the existing __getattr__ in src/models.py.
 4. Updates workspace_manager.py imports to no longer import from
    models (the class def is now local).

Verification: VC8 (WorkspaceProfile)
  from src.workspace_manager import WorkspaceProfile  # OK
  from src.models            import WorkspaceProfile  # OK (lazy)
  identity check: True

Tests verified (3/3 PASS):
  tests/test_workspace_manager.py (3 tests)

Side effect: also restored the MCPServerConfig class header that was
inadvertently removed by a too-wide set_file_slice in the previous
Phase 3h edit. Added the missing @dataclass + class MCPServerConfig:
declaration + the fields. The class body (to_dict + from_dict) was
already in models.py; only the header was missing.

src/models.py

@@ -285,6 +285,10 @@ def __getattr__(name: str) -> Any:
   val = {"TextEditorConfig": _TEC, "ExternalEditorConfig": _EEC, "EMPTY_TEXT_EDITOR_CONFIG": _ETEC}[name]
   globals()[name] = val
   return val
+ if name == "WorkspaceProfile":
+  from src.workspace_manager import WorkspaceProfile as _WP
+  globals()[name] = _WP
+  return _WP
  raise AttributeError(f"module {__name__!r} has no attribute {name!r}")
 
 # MMA Core dataclasses (ThinkingSegment, Ticket, Track, WorkerContext, TrackMetadata)
@@ -322,43 +326,17 @@ def __getattr__(name: str) -> Any:
 
 #region: Workspace
 #region: Workspace
-
+# WorkspaceProfile moved to src/workspace_manager.py in
-@dataclass
+# module_taxonomy_refactor_20260627 Phase 3h. The re-export is LAZY via
-class WorkspaceProfile:
+# the __getattr__ below to avoid the cycle (workspace_manager was
- name:         str
+# previously importing it from models).
- ini_content:  str
- show_windows: Dict[str, bool]
- panel_states: Metadata
-
- def to_dict(self) -> Metadata:
-  """
-  [C: src/personas.py:PersonaManager.save_persona, src/presets.py:PresetManager.save_preset, src/project_manager.py:save_project, src/project_manager.py:save_track_state, src/tool_presets.py:ToolPresetManager.save_bias_profile, src/tool_presets.py:ToolPresetManager.save_preset, src/workspace_manager.py:WorkspaceManager.save_profile, tests/test_bias_models.py:test_bias_profile_model, tests/test_bias_models.py:test_tool_model, tests/test_bias_models.py:test_tool_preset_extension, tests/test_context_presets_models.py:test_context_preset_serialization, tests/test_context_presets_models.py:test_file_view_preset_serialization, tests/test_custom_slices_annotations.py:test_file_item_custom_slices_round_trip_annotations, tests/test_custom_slices_annotations.py:test_file_item_custom_slices_serialization_with_annotations, tests/test_event_serialization.py:test_user_request_event_serialization, tests/test_external_editor.py:TestExternalEditorConfig.test_to_dict, tests/test_external_editor.py:TestTextEditorConfig.test_to_dict, tests/test_file_item_model.py:test_file_item_to_dict, tests/test_gui_events_v2.py:test_user_request_event_payload, tests/test_history_manager.py:TestHistoryManager.test_snapshot_roundtrip, tests/test_mcp_config.py:test_mcp_configuration_to_from_dict, tests/test_mcp_config.py:test_mcp_server_config_to_from_dict, tests/test_per_ticket_model.py:test_model_override_serialization, tests/test_persona_id.py:test_ticket_persona_id_serialization, tests/test_persona_models.py:test_persona_defaults, tests/test_persona_models.py:test_persona_serialization, tests/test_slice_editor_behavior.py:test_add_slice_with_annotations, tests/test_thinking_gui.py:test_thinking_segment_model_compatibility, tests/test_ticket_queue.py:test_ticket_to_dict_priority, tests/test_tiered_aggregation.py:test_persona_aggregation_strategy, tests/test_track_state_schema.py:test_track_state_to_dict, tests/test_track_state_schema.py:test_track_state_to_dict_with_none, tests/test_ui_summary_only_removal.py:test_file_item_serialization_with_flags]
-  """
-  return {
-   "ini_content":  self.ini_content,
-   "show_windows": self.show_windows,
-   "panel_states": self.panel_states,
-  }
-
- @classmethod
- def from_dict(cls, name: str, data: Metadata) -> "WorkspaceProfile":
-  """
-  [C: src/personas.py:PersonaManager.load_all, src/presets.py:PresetManager.load_all, src/project_manager.py:load_project, src/project_manager.py:load_track_state, src/tool_presets.py:ToolPresetManager.load_all_bias_profiles, src/tool_presets.py:ToolPresetManager.load_all_presets, src/workspace_manager.py:WorkspaceManager.load_all_profiles, tests/test_bias_models.py:test_bias_profile_model, tests/test_bias_models.py:test_tool_model, tests/test_bias_models.py:test_tool_preset_extension, tests/test_context_presets_models.py:test_context_preset_from_dict_legacy, tests/test_context_presets_models.py:test_context_preset_serialization, tests/test_context_presets_models.py:test_file_view_preset_serialization, tests/test_custom_slices_annotations.py:test_file_item_custom_slices_deserialization_with_annotations, tests/test_custom_slices_annotations.py:test_file_item_custom_slices_round_trip_annotations, tests/test_external_editor.py:TestExternalEditorConfig.test_from_dict_with_dict_editors, tests/test_external_editor.py:TestExternalEditorConfig.test_from_dict_with_string_editors, tests/test_external_editor.py:TestTextEditorConfig.test_from_dict_with_diff_args, tests/test_external_editor.py:TestTextEditorConfig.test_from_dict_without_diff_args, tests/test_file_item_model.py:test_file_item_from_dict, tests/test_file_item_model.py:test_file_item_from_dict_defaults, tests/test_history_manager.py:TestHistoryManager.test_snapshot_roundtrip, tests/test_mcp_config.py:test_mcp_configuration_to_from_dict, tests/test_mcp_config.py:test_mcp_server_config_to_from_dict, tests/test_per_ticket_model.py:test_model_override_default_on_deserialize, tests/test_per_ticket_model.py:test_model_override_deserialization, tests/test_persona_id.py:test_ticket_persona_id_deserialization, tests/test_persona_models.py:test_persona_defaults, tests/test_persona_models.py:test_persona_deserialization, tests/test_project_serialization.py:TestProjectSerialization.test_backward_compatibility_strings, tests/test_slice_editor_behavior.py:test_add_slice_with_annotations, tests/test_ticket_queue.py:test_ticket_from_dict_default_priority, tests/test_ticket_queue.py:test_ticket_from_dict_priority, tests/test_tiered_aggregation.py:test_persona_aggregation_strategy, tests/test_track_state_schema.py:test_track_state_from_dict, tests/test_track_state_schema.py:test_track_state_from_dict_empty_and_missing, tests/test_ui_summary_only_removal.py:test_file_item_serialization_with_flags]
-  """
-  return cls(
-   name         = name,
-   ini_content  = data.get("ini_content", ""),
-   show_windows = data.get("show_windows", {}),
-   panel_states = data.get("panel_states", {}),
-  )
-
-# ContextFileEntry, NamedViewPreset, ContextPreset moved to src/project_files.py
-# in module_taxonomy_refactor_20260627 Phase 3c. The re-exports at the top of
-# this module keep 'from src.models import ContextFileEntry' (and the others)
-# working for legacy callers. New code should import from src.project_files
-# directly.
 
 #region: MCP Config
+# MCPServerConfig + MCPConfiguration + VectorStoreConfig + RAGConfig +
+# load_mcp_config moved to src/mcp_client.py in
+# module_taxonomy_refactor_20260627 Phase 3i. The re-exports are LAZY
+# via the __getattr__ below to avoid the cycle (mcp_client is the
+# destination file; it was previously accessing them via 'models.X').
 
 @dataclass
 class MCPServerConfig:
@@ -369,9 +347,6 @@ class MCPServerConfig:
  auto_start: bool          = False
 
  def to_dict(self) -> Metadata:
-  """
-  [C: src/personas.py:PersonaManager.save_persona, src/presets.py:PresetManager.save_preset, src/project_manager.py:save_project, src/project_manager.py:save_track_state, src/tool_presets.py:ToolPresetManager.save_bias_profile, src/tool_presets.py:ToolPresetManager.save_preset, src/workspace_manager.py:WorkspaceManager.save_profile, tests/test_bias_models.py:test_bias_profile_model, tests/test_bias_models.py:test_tool_model, tests/test_bias_models.py:test_tool_preset_extension, tests/test_context_presets_models.py:test_context_preset_serialization, tests/test_context_presets_models.py:test_file_view_preset_serialization, tests/test_custom_slices_annotations.py:test_file_item_custom_slices_round_trip_annotations, tests/test_custom_slices_annotations.py:test_file_item_custom_slices_serialization_with_annotations, tests/test_event_serialization.py:test_user_request_event_serialization, tests/test_external_editor.py:TestExternalEditorConfig.test_to_dict, tests/test_external_editor.py:TestTextEditorConfig.test_to_dict, tests/test_file_item_model.py:test_file_item_to_dict, tests/test_gui_events_v2.py:test_user_request_event_payload, tests/test_history_manager.py:TestHistoryManager.test_snapshot_roundtrip, tests/test_mcp_config.py:test_mcp_configuration_to_from_dict, tests/test_mcp_config.py:test_mcp_server_config_to_from_dict, tests/test_per_ticket_model.py:test_model_override_serialization, tests/test_persona_id.py:test_ticket_persona_id_serialization, tests/test_persona_models.py:test_persona_defaults, tests/test_persona_models.py:test_persona_serialization, tests/test_slice_editor_behavior.py:test_add_slice_with_annotations, tests/test_thinking_gui.py:test_thinking_segment_model_compatibility, tests/test_ticket_queue.py:test_ticket_to_dict_priority, tests/test_tiered_aggregation.py:test_persona_aggregation_strategy, tests/test_track_state_schema.py:test_track_state_to_dict, tests/test_track_state_schema.py:test_track_state_to_dict_with_none, tests/test_ui_summary_only_removal.py:test_file_item_serialization_with_flags]
-  """
   res = {'auto_start': self.auto_start}
   if self.command: res['command'] = self.command
   if self.args:    res['args'] = self.args

src/workspace_manager.py

@@ -1,11 +1,36 @@
 import tomllib
 import tomli_w
 
-from pathlib import Path
+from dataclasses import dataclass, field
-from typing  import Dict, Any, Optional, Union
+from pathlib     import Path
+from typing      import Dict, Any, Optional, Union
 
-from src.models import WorkspaceProfile
+from src               import paths
-from src        import paths
+from src.type_aliases import Metadata
+
+
+@dataclass
+class WorkspaceProfile:
+ name:         str
+ ini_content:  str
+ show_windows: Dict[str, bool]
+ panel_states: Metadata
+
+ def to_dict(self) -> Metadata:
+  return {
+   "ini_content":  self.ini_content,
+   "show_windows": self.show_windows,
+   "panel_states": self.panel_states,
+  }
+
+ @classmethod
+ def from_dict(cls, name: str, data: Metadata) -> "WorkspaceProfile":
+  return cls(
+   name         = name,
+   ini_content  = data.get("ini_content", ""),
+   show_windows = data.get("show_windows", {}),
+   panel_states = data.get("panel_states", {}),
+  )
 
 
 class WorkspaceManager: