Merge origin/tier2/module_taxonomy_refactor_20260627: bring in v2 SHIPPED work

Per post_module_taxonomy_de_cruft_20260627 Phase 0 prerequisite.
Master is at 6344b49f (pre-merge of v2 SHIPPED). This merge brings in
the 18 v2 SHIPPED commits that define the destination modules
(src.mma, src/project.py, src/project_files.py, src.tool_presets,
src.tool_bias, src.external_editor, src.personas,
src.workspace_manager, src.mcp_client) needed by the Phase 2
consumer migration in commit 8f11340b.

Conflicts resolved (all were import-block re-orderings between my
migration's update and v2 SHIPPED's update of the same files):
 - src/external_editor.py: took v2 SHIPPED version (class definitions
                                    + the no-alias import pattern)
 - src/personas.py: took v2 SHIPPED version
 - src/tool_bias.py: took v2 SHIPPED version
 - src/tool_presets.py: took v2 SHIPPED version
 - src/workspace_manager.py: took v2 SHIPPED version
 - src/ai_client.py: took v2 SHIPPED version (removes the 'as _FIC'
                              alias; uses 'from src.project_files import
                              FileItem' directly per the v2 SHIPPED style)
 - conductor/tracks/module_taxonomy_refactor_20260627/spec.md: took
                              HEAD version (my Phase 1 VC2 + VC10
                              corrections; the v2 SHIPPED version was
                              the pre-correction spec)

src/workspace_manager.py

@@ -1,10 +1,36 @@
 import tomllib
 import tomli_w
 
-from pathlib import Path
-from typing  import Dict, Any, Optional, Union
+from dataclasses import dataclass, field
+from pathlib     import Path
+from typing      import Dict, Any, Optional, Union
 
-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:
@@ -80,4 +106,4 @@ class WorkspaceManager:
  def _save_file(self, path: Path, data: Dict[str, Any]) -> None:
   path.parent.mkdir(parents=True, exist_ok=True)
   with open(path, "wb") as f:
-   tomli_w.dump(data, f)
+   tomli_w.dump(data, f)