diff --git a/src/app_controller.py b/src/app_controller.py
index 95e8a2e2..d7a79ca6 100644
--- a/src/app_controller.py
+++ b/src/app_controller.py
@@ -28,7 +28,7 @@ from pathlib     import Path
 from typing      import Any, List, Dict, Optional, Callable
 
 from src import aggregate
-from src import models
+from src.project_files import FileItem
 from src import ai_client
 from src.module_loader import _require_warmed
 from src import conductor_tech_lead
@@ -58,8 +58,6 @@ from src.type_aliases import (
  CommsLog,
  CommsLogCallback,
  CommsLogEntry,
- FileItem,
- FileItems,
  History,
  HistoryMessage,
  Metadata,
@@ -1776,15 +1774,15 @@ class AppController:
 
  @ui_file_paths.setter
  def ui_file_paths(self, value: list[str]) -> None:
+  from src.project_files import FileItem
+  import time
   old_files = {f.path: f for f in self.files}
   new_files = []
-  import time
   now = time.time()
   for p in value:
    if p in old_files:
     new_files.append(old_files[p])
    else:
-    from src import models
     new_files.append(FileItem(path=p, injected_at=now))
   self.files = new_files
 
diff --git a/src/gui_2.py b/src/gui_2.py
index 478c690c..baed59a0 100644
--- a/src/gui_2.py
+++ b/src/gui_2.py
@@ -110,7 +110,7 @@ from src import project_manager
 from src import session_logger
 from src import log_registry
 # from src import log_pruner
-from src import models
+
 from src.api_hooks import GenerateRequest, ConfirmRequest
 from src.ai_client import DEFAULT_TOOL_CATEGORIES
 from src import mcp_client
@@ -120,6 +120,11 @@ from src import theme_2 as theme
 from src import thinking_parser
 from src import workspace_manager
 from src.hot_reloader import HotReloader
+from src.personas import Persona
+from src.project import parse_history_entries
+from src.project_files import FileItem, ContextFileEntry, ContextPreset
+from src.tool_bias import BiasProfile
+from src.tool_presets import Tool
 from src.type_aliases import HistoryMessage, SessionInsights
 
 win32gui: Any = None
@@ -541,12 +546,10 @@ class App:
   self._hot_reload_error: Optional[str] = None
 
  def _set_context_files(self, paths: list[str]) -> None:
-  from src import models
   self.context_files            = [FileItem(path=p) for p in paths]
   self.controller.context_files = self.context_files
 
  def _simulate_save_preset(self, name: str) -> None:
-  from src import models
   item               = FileItem(path='test.py')
   self.files         = [item]
   self.context_files = [item]
@@ -863,17 +866,16 @@ class App:
    self.disc_entries               = snapshot.disc_entries
    
    # Restore files as FileItem objects
-   from src import models
    self.files = []
    for f in snapshot.files:
     if isinstance(f, dict): self.files.append(FileItem.from_dict(f))
     else:                   self.files.append(FileItem(path=str(f)))
-   
+
    self.context_files = []
    for f in snapshot.context_files:
     if isinstance(f, dict): self.context_files.append(FileItem.from_dict(f))
     else:                   self.context_files.append(FileItem(path=str(f)))
-   
+
    self.screenshots       = list(snapshot.screenshots)
    self._last_ui_snapshot = snapshot # Update last snapshot to avoid immediate re-push
   finally:
@@ -972,8 +974,6 @@ class App:
 
  def load_context_preset(self, name: str) -> None:
   preset = self.controller.load_context_preset(name)
-  from src import models
-  import copy
   self.context_files = []
   for f in preset.files:
    fi = FileItem(path=f.path, view_mode=f.view_mode)
@@ -1007,7 +1007,6 @@ class App:
    if p in old_files:
     new_files.append(old_files[p])
    else:
-    from src import models
     new_files.append(FileItem(path=p, injected_at=now))
   self.files = new_files
 
@@ -1241,8 +1240,6 @@ class App:
   if path: self.controller.cb_load_prior_log(path)
 
  def _set_external_editor_default(self, editor_name: str) -> None:
-  from src import models
-  if "tools" not in self.config:                   self.config["tools"] = {}
   if "default_editor" not in self.config["tools"]: self.config["tools"]["default_editor"] = {}
   self.config["tools"]["default_editor"]["default_editor"] = editor_name
   self.save_config()
@@ -3694,8 +3691,6 @@ def render_files_and_media(app: App) -> None:
          
          if imgui.button(f"+##add_f_{i}"):
           if not in_context:
-           from src import models
-           new_item = FileItem(path=fpath)
            app.context_files.append(new_item)
            app._populate_auto_slices(new_item)
          
@@ -3717,10 +3712,6 @@ def render_files_and_media(app: App) -> None:
   imgui.dummy(imgui.ImVec2(0, 5))
   if imgui.button("Add Files to Inventory"):
    r = hide_tk_root(); paths = filedialog.askopenfilenames(); r.destroy()
-   from src import models
-   for p in paths:
-    if p not in [f.path for f in app.files]: app.files.append(FileItem(path=p))
-  imgui.same_line()
   if imgui.button("Add Directory"):
    r = hide_tk_root(); dirpath = filedialog.askdirectory(); r.destroy()
    if dirpath:
@@ -4363,8 +4354,6 @@ def render_context_presets(app: App) -> None:
     preset_files = []
     for f in app.context_files:
      import copy
-     from src import models
-     p   = f.path
      vm  = f.view_mode
      slc = copy.deepcopy(f.custom_slices)
      msk = copy.deepcopy(f.ast_mask)
@@ -4403,10 +4392,6 @@ def render_context_presets(app: App) -> None:
      preset_files = []
      for f in app.context_files:
       import copy
-      from src import models
-      p   = f.path
-      vm  = f.view_mode
-      slc = copy.deepcopy(f.custom_slices)
       msk = copy.deepcopy(f.ast_mask)
       sig = f.ast_signatures
       dfn = f.ast_definitions
@@ -4538,8 +4523,6 @@ def render_context_modals(app: App) -> None:
    preset_files = []
    for f in app.context_files:
     import copy
-    from src import models
-    p   = f.path
     vm  = f.view_mode
     slc = copy.deepcopy(f.custom_slices)
     msk = copy.deepcopy(f.ast_mask)
diff --git a/tests/test_generate_type_registry.py b/tests/test_generate_type_registry.py
index feb53eab..d798af9e 100644
--- a/tests/test_generate_type_registry.py
+++ b/tests/test_generate_type_registry.py
@@ -26,14 +26,26 @@ def test_script_generates_type_aliases_md() -> None:
  aliases_path = REGISTRY_DIR / "type_aliases.md"
  assert aliases_path.exists()
  content = aliases_path.read_text()
- assert "Metadata" in content
+ # Per metadata_promotion_20260624, Metadata is now a dataclass (lives in
+ # src_type_aliases.md). The type_aliases.md file lists semantic aliases
+ # only; CommsLogEntry and FileItems remain TypeAliases and live here.
  assert "CommsLogEntry" in content
  assert "FileItems" in content
+ # Metadata is now in src_type_aliases.md (the dataclass form).
+ src_aliases_path = REGISTRY_DIR / "src_type_aliases.md"
+ assert src_aliases_path.exists()
+ src_content = src_aliases_path.read_text()
+ assert "Metadata" in src_content
 
 
 def test_script_generates_per_source_file_md() -> None:
  subprocess.run([sys.executable, str(SCRIPT)], capture_output=True, text=True, cwd=REPO_ROOT, check=True)
- models_path = REGISTRY_DIR / "src_models.md"
+ # src_models.py no longer has dataclasses (per post_module_taxonomy_de_cruft_20260627
+ # Phases 2-4: all dataclasses moved to subsystem modules; src/models.py keeps only
+ # the legacy Metadata alias and PROVIDERS lazy __getattr__). The type registry
+ # generates one .md per source file that has structs. Verify a representative
+ # data-bearing file exists instead.
+ models_path = REGISTRY_DIR / "src_mma.md"
  assert models_path.exists()
 
 
diff --git a/tests/test_gui_2_result.py b/tests/test_gui_2_result.py
index 860c1159..720775ea 100644
--- a/tests/test_gui_2_result.py
+++ b/tests/test_gui_2_result.py
@@ -730,7 +730,7 @@ def test_phase_4_l3398_render_persona_editor_save_result_success():
  app._editing_persona_preferred_models_list = []
  mock_persona = MagicMock(name="mock_persona")
  mock_persona.name = "test_persona"
- with patch.object(gui_2.models, "Persona", return_value=mock_persona):
+ with patch("src.gui_2.Persona", return_value=mock_persona):
   result = gui_2._render_persona_editor_save_result(app)
  assert result.ok, f"Expected ok=True on success, got errors: {result.errors}"
  assert result.data is True
@@ -756,7 +756,7 @@ def test_phase_4_l3398_render_persona_editor_save_result_failure():
  app._editing_persona_context_preset_id = ""
  app._editing_persona_aggregation_strategy = ""
  app._editing_persona_preferred_models_list = []
- with patch.object(gui_2.models, "Persona", side_effect=RuntimeError("validation failed")):
+ with patch("src.gui_2.Persona", side_effect=RuntimeError("validation failed")):
   result = gui_2._render_persona_editor_save_result(app)
  assert not result.ok, f"Expected ok=False on failure, got data: {result.data}"
  assert result.errors, "Expected at least one error on failure"
@@ -1095,7 +1095,7 @@ def test_phase_5_l1428_request_patch_from_tier4_result_success():
  patch_text = "--- a/foo.py\n+++ b/foo.py\n@@ -1 +1 @@\n-old\n+new\n"
  mock_diff_files = [MagicMock(old_path="/proj/foo/foo.py", new_path="/proj/foo/foo.py")]
  with patch.object(gui_2.ai_client, "run_tier4_patch_generation", return_value=patch_text), \
-   patch("src.diff_viewer.parse_diff", return_value=mock_diff_files):
+   patch("src.gui_2.parse_diff", return_value=mock_diff_files):
   result = gui_2.request_patch_from_tier4_result(app, "boom", "/proj/foo/foo.py")
  assert result.ok, f"Expected ok=True on success, got errors: {result.errors}"
  assert result.data is True
@@ -1141,7 +1141,7 @@ def test_phase_5_l3163_render_tool_preset_bias_save_result_success():
  app._editing_tool_preset_scope                      = "project"
  mock_profile = MagicMock()
  mock_profile.name = "test_bias"
- with patch.object(gui_2.models, "BiasProfile", return_value=mock_profile):
+ with patch("src.gui_2.BiasProfile", return_value=mock_profile):
   result = gui_2._render_tool_preset_bias_save_result(app)
  assert result.ok, f"Expected ok=True on success, got errors: {result.errors}"
  assert result.data is True
@@ -1163,7 +1163,7 @@ def test_phase_5_l3163_render_tool_preset_bias_save_result_failure():
  app._editing_bias_profile_tool_weights              = {"foo": 2}
  app._editing_bias_profile_category_multipliers       = {"bar": 1.5}
  app._editing_tool_preset_scope                      = "project"
- with patch.object(gui_2.models, "BiasProfile", side_effect=RuntimeError("bias validation failed")):
+ with patch("src.gui_2.BiasProfile", side_effect=RuntimeError("bias validation failed")):
   result = gui_2._render_tool_preset_bias_save_result(app)
  assert not result.ok, f"Expected ok=False on failure, got data: {result.data}"
  assert result.errors, "Expected at least one error on failure"
diff --git a/tests/test_models_no_top_level_tomli_w.py b/tests/test_models_no_top_level_tomli_w.py
index ea29b40c..4438ab1d 100644
--- a/tests/test_models_no_top_level_tomli_w.py
+++ b/tests/test_models_no_top_level_tomli_w.py
@@ -41,12 +41,13 @@ def test_models_does_not_import_tomli_w_at_module_level() -> None:
 def test_models_can_still_call_save_config_after_lazy_load() -> None:
  """save_config() must work even though tomli_w is lazy-loaded."""
  import src.models
+ from src.project import save_config_to_disk
  config = {
   "ai": {"provider": "minimax", "model": "MiniMax-M3", "temperature": 0.0},
   "theme": {"palette": "solarized_dark", "font_size": 16.0},
  }
  try:
-  src.models.save_config_to_disk(config)
+  save_config_to_disk(config)
  except Exception as e:
   pytest.fail(f"save_config raised after lazy tomli_w: {e}")
  finally:
@@ -57,13 +58,14 @@ def test_models_can_still_call_save_config_after_lazy_load() -> None:
 def test_save_config_uses_tomli_w_on_demand() -> None:
  """First call to save_config() should trigger tomli_w import (subsequent calls hit sys.modules cache)."""
  import src.models
+ from src.project import save_config_to_disk
  # Drop tomli_w from sys.modules if it was already loaded (e.g. by other tests)
  if "tomli_w" in sys.modules:
   del sys.modules["tomli_w"]
  assert "tomli_w" not in sys.modules
  # Call save_config - this should trigger the import
  try:
-  src.models.save_config_to_disk({"test_key": "test_value"})
+  save_config_to_disk({"test_key": "test_value"})
  except Exception:
   # We don't care if the save itself fails; we just want to verify
   # the import happened.
diff --git a/tests/test_rag_engine_ready_status_bug.py b/tests/test_rag_engine_ready_status_bug.py
index 2a9889ab..045b8c70 100644
--- a/tests/test_rag_engine_ready_status_bug.py
+++ b/tests/test_rag_engine_ready_status_bug.py
@@ -37,6 +37,7 @@ def test_rag_engine_init_with_local_provider_raises_when_sentence_transformers_m
  when sentence-transformers is not installed.
  """
  from src import models
+ from src.mcp_client import RAGConfig, VectorStoreConfig
  config = RAGConfig(
    enabled=True,
    embedding_provider="local",
@@ -125,6 +126,7 @@ def test_rag_engine_init_with_failing_local_embedding_leaves_engine_broken() ->
  """
  from src import models
  from src import rag_engine
+ from src.mcp_client import RAGConfig, VectorStoreConfig
  config = RAGConfig(
    enabled=True,
    embedding_provider="local",