feat(gui): Merge Session Hub into Discussion Hub

- Removed Session Hub window from _gui_func
- Discussion Hub now has tab bar: Discussion | Context Composition | Snapshot | Takes
- _render_discussion_tab: history + message/response tabs
- _render_snapshot_tab: Aggregate MD + System Prompt (moved from Session Hub)
- _render_context_composition_placeholder: placeholder for Phase 3
- _render_takes_placeholder: placeholder for Phase 4

manualslop_layout.ini

@@ -102,26 +102,26 @@ Collapsed=0
 DockId=0x0000000D,0
 
 [Window][Discussion Hub]
-Pos=1228,24
+Pos=1126,24
-Size=1638,1651
+Size=1638,1608
 Collapsed=0
 DockId=0x00000006,0
 
 [Window][Operations Hub]
 Pos=0,24
-Size=1226,1651
+Size=1124,1608
 Collapsed=0
 DockId=0x00000005,2
 
 [Window][Files & Media]
-Pos=1228,24
+Pos=1126,24
-Size=1638,1651
+Size=1638,1608
 Collapsed=0
 DockId=0x00000006,1
 
 [Window][AI Settings]
 Pos=0,24
-Size=1226,1651
+Size=1124,1608
 Collapsed=0
 DockId=0x00000005,0
 
@@ -407,7 +407,7 @@ DockId=0x00000006,1
 
 [Window][Project Settings]
 Pos=0,24
-Size=1226,1651
+Size=1124,1608
 Collapsed=0
 DockId=0x00000005,1
 
@@ -524,11 +524,11 @@ Column 1  Weight=1.0000
 DockNode          ID=0x00000008 Pos=3125,170 Size=593,1157 Split=Y
   DockNode        ID=0x00000009 Parent=0x00000008 SizeRef=1029,147 Selected=0x0469CA7A
   DockNode        ID=0x0000000A Parent=0x00000008 SizeRef=1029,145 Selected=0xDF822E02
-DockSpace         ID=0xAFC85805 Window=0x079D3A04 Pos=0,24 Size=2866,1651 Split=X
+DockSpace         ID=0xAFC85805 Window=0x079D3A04 Pos=0,24 Size=2764,1608 Split=X
   DockNode        ID=0x00000003 Parent=0xAFC85805 SizeRef=2175,1183 Split=X
     DockNode      ID=0x0000000B Parent=0x00000003 SizeRef=404,1186 Split=X Selected=0xF4139CA2
       DockNode    ID=0x00000007 Parent=0x0000000B SizeRef=1512,858 Split=X Selected=0x8CA2375C
-        DockNode  ID=0x00000005 Parent=0x00000007 SizeRef=1226,1681 CentralNode=1 Selected=0x418C7449
+        DockNode  ID=0x00000005 Parent=0x00000007 SizeRef=1226,1681 CentralNode=1 Selected=0x7BD57D6A
         DockNode  ID=0x00000006 Parent=0x00000007 SizeRef=1638,1681 Selected=0x6F2B5B04
       DockNode    ID=0x0000000E Parent=0x0000000B SizeRef=1777,858 Selected=0x418C7449
     DockNode      ID=0x0000000D Parent=0x00000003 SizeRef=435,1186 Selected=0x363E93D6

project_history.toml

@@ -9,5 +9,5 @@ active = "main"
 
 [discussions.main]
 git_commit = ""
-last_updated = "2026-03-22T12:57:36"
+last_updated = "2026-03-22T12:59:02"
 history = []

src/gui_2.py

@@ -215,7 +215,6 @@ class App:
   self.show_windows.setdefault("Tier 4: QA", False)
   self.show_windows.setdefault('External Tools', False)
   self.show_windows.setdefault('Shader Editor', False)
-  self.show_windows.setdefault('Session Hub', False)
   self.ui_multi_viewport = gui_cfg.get("multi_viewport", False)
   self.layout_presets = self.config.get("layout_presets", {})
   self._new_preset_name = ""
@@ -724,50 +723,20 @@ class App:
     exp, opened = imgui.begin("Discussion Hub", self.show_windows["Discussion Hub"])
     self.show_windows["Discussion Hub"] = bool(opened)
     if exp:
-    # Top part for the history
+     if imgui.begin_tab_bar("discussion_hub_tabs"):
-     imgui.begin_child("HistoryChild", size=(0, -self.ui_discussion_split_h))
+      if imgui.begin_tab_item("Discussion")[0]:
-     if self.perf_profiling_enabled: self.perf_monitor.start_component("_render_discussion_panel")
+       self._render_discussion_tab()
-     self._render_discussion_panel()
-     if self.perf_profiling_enabled: self.perf_monitor.end_component("_render_discussion_panel")
-     imgui.end_child()
-     # Splitter
-     imgui.button("###discussion_splitter", imgui.ImVec2(-1, 4))
-     if imgui.is_item_active():
-      self.ui_discussion_split_h = max(150.0, min(imgui.get_window_height() - 150.0, self.ui_discussion_split_h - imgui.get_io().mouse_delta.y))
-     # Bottom part with tabs for message and response
-     # Detach controls
-     imgui.push_style_var(imgui.StyleVar_.item_spacing, imgui.ImVec2(10, 4))
-     ch1, self.ui_separate_message_panel = imgui.checkbox("Pop Out Message", self.ui_separate_message_panel)
-     imgui.same_line()
-     ch2, self.ui_separate_response_panel = imgui.checkbox("Pop Out Response", self.ui_separate_response_panel)
-     if ch1: self.show_windows["Message"] = self.ui_separate_message_panel
-     if ch2: self.show_windows["Response"] = self.ui_separate_response_panel
-     imgui.pop_style_var()
-
-     show_message_tab = not self.ui_separate_message_panel
-     show_response_tab = not self.ui_separate_response_panel
-
-     if show_message_tab or show_response_tab:
-      if imgui.begin_tab_bar("discussion_tabs"):
-       # Task: Auto-focus Response tab when response received
-       tab_flags = imgui.TabItemFlags_.none
-       if self._autofocus_response_tab:
-        tab_flags = imgui.TabItemFlags_.set_selected
-        self._autofocus_response_tab = False
-        self.controller._autofocus_response_tab = False
-
-       if show_message_tab:
-        if imgui.begin_tab_item("Message", None)[0]:
-         self._render_message_panel()
        imgui.end_tab_item()
-       if show_response_tab:
+      if imgui.begin_tab_item("Context Composition")[0]:
-        if imgui.begin_tab_item("Response", None, tab_flags)[0]:
+       self._render_context_composition_placeholder()
-         self._render_response_panel()
+       imgui.end_tab_item()
+      if imgui.begin_tab_item("Snapshot")[0]:
+       self._render_snapshot_tab()
+       imgui.end_tab_item()
+      if imgui.begin_tab_item("Takes")[0]:
+       self._render_takes_placeholder()
        imgui.end_tab_item()
       imgui.end_tab_bar()
-     else:
-      imgui.text_disabled("Message & Response panels are detached.")
-
     imgui.end()
    if self.show_windows.get("Operations Hub", False):
     exp, opened = imgui.begin("Operations Hub", self.show_windows["Operations Hub"])
@@ -842,8 +811,6 @@ class App:
    if self.show_windows.get("Diagnostics", False):
     self._render_diagnostics_panel()
 
-   self._render_session_hub()
-
    self.perf_monitor.end_frame()
    # ---- Modals / Popups
    with self._pending_dialog_lock:
@@ -2081,13 +2048,51 @@ class App:
   if self.perf_profiling_enabled: self.perf_monitor.end_component("_render_diagnostics_panel")
   imgui.end()
 
- def _render_session_hub(self) -> None:
+ def _render_discussion_tab(self) -> None:
-  if self.show_windows.get('Session Hub', False):
+  imgui.begin_child("HistoryChild", size=(0, -self.ui_discussion_split_h))
-   exp, opened = imgui.begin('Session Hub', self.show_windows['Session Hub'])
+  if self.perf_profiling_enabled: self.perf_monitor.start_component("_render_discussion_panel")
-   self.show_windows['Session Hub'] = bool(opened)
+  self._render_discussion_panel()
-   if exp:
+  if self.perf_profiling_enabled: self.perf_monitor.end_component("_render_discussion_panel")
-    if imgui.begin_tab_bar('session_hub_tabs'):
+  imgui.end_child()
-     if imgui.begin_tab_item('Aggregate MD')[0]:
+  imgui.button("###discussion_splitter", imgui.ImVec2(-1, 4))
+  if imgui.is_item_active():
+   self.ui_discussion_split_h = max(150.0, min(imgui.get_window_height() - 150.0, self.ui_discussion_split_h - imgui.get_io().mouse_delta.y))
+  imgui.push_style_var(imgui.StyleVar_.item_spacing, imgui.ImVec2(10, 4))
+  ch1, self.ui_separate_message_panel = imgui.checkbox("Pop Out Message", self.ui_separate_message_panel)
+  imgui.same_line()
+  ch2, self.ui_separate_response_panel = imgui.checkbox("Pop Out Response", self.ui_separate_response_panel)
+  if ch1: self.show_windows["Message"] = self.ui_separate_message_panel
+  if ch2: self.show_windows["Response"] = self.ui_separate_response_panel
+  imgui.pop_style_var()
+  show_message_tab = not self.ui_separate_message_panel
+  show_response_tab = not self.ui_separate_response_panel
+  if show_message_tab or show_response_tab:
+   if imgui.begin_tab_bar("discussion_tabs"):
+    tab_flags = imgui.TabItemFlags_.none
+    if self._autofocus_response_tab:
+     tab_flags = imgui.TabItemFlags_.set_selected
+     self._autofocus_response_tab = False
+     self.controller._autofocus_response_tab = False
+    if show_message_tab:
+     if imgui.begin_tab_item("Message", None)[0]:
+      self._render_message_panel()
+      imgui.end_tab_item()
+    if show_response_tab:
+     if imgui.begin_tab_item("Response", None, tab_flags)[0]:
+      self._render_response_panel()
+      imgui.end_tab_item()
+    imgui.end_tab_bar()
+  else:
+   imgui.text_disabled("Message & Response panels are detached.")
+
+ def _render_context_composition_placeholder(self) -> None:
+  imgui.text("Context Composition")
+  imgui.separator()
+  imgui.text_colored(imgui.ImColor.IM_COL32(150, 150, 150, 255).Value, "Coming in Phase 3...")
+
+ def _render_snapshot_tab(self) -> None:
+  if imgui.begin_tab_bar("snapshot_tabs"):
+   if imgui.begin_tab_item("Aggregate MD")[0]:
     display_md = self.last_aggregate_markdown
     if self.ui_focus_agent:
      tier_usage = self.mma_tier_usage.get(self.ui_focus_agent)
@@ -2100,7 +2105,6 @@ class App:
         if cp_name in self._focus_md_cache:
          display_md = self._focus_md_cache[cp_name]
         else:
-           # Generate focused aggregate
          flat = src.project_manager.flat_config(self.controller.project, self.active_discussion)
          cp = self.controller.project.get('context_presets', {}).get(cp_name)
          if cp:
@@ -2112,18 +2116,22 @@ class App:
     if imgui.button("Copy"):
      imgui.set_clipboard_text(display_md)
     imgui.begin_child("last_agg_md", imgui.ImVec2(0, 0), True)
-      markdown_helper.render(display_md, context_id="session_hub_agg")
+    markdown_helper.render(display_md, context_id="snapshot_agg")
     imgui.end_child()
     imgui.end_tab_item()
-     if imgui.begin_tab_item('System Prompt')[0]:
+   if imgui.begin_tab_item("System Prompt")[0]:
     if imgui.button("Copy"):
      imgui.set_clipboard_text(self.last_resolved_system_prompt)
     imgui.begin_child("last_sys_prompt", imgui.ImVec2(0, 0), True)
-      markdown_helper.render(self.last_resolved_system_prompt, context_id="session_hub_sys")
+    markdown_helper.render(self.last_resolved_system_prompt, context_id="snapshot_sys")
     imgui.end_child()
     imgui.end_tab_item()
    imgui.end_tab_bar()
-   imgui.end()
+
+ def _render_takes_placeholder(self) -> None:
+  imgui.text("Takes & Synthesis")
+  imgui.separator()
+  imgui.text_colored(imgui.ImColor.IM_COL32(150, 150, 150, 255).Value, "Coming in Phase 4...")
 
  def _render_markdown_test(self) -> None:
   imgui.text("Markdown Test Panel")

tests/test_session_hub_merge.py

@@ -0,0 +1,42 @@
+import pytest
+import inspect
+
+
+def test_session_hub_window_removed():
+    import src.gui_2 as gui_2
+
+    source = inspect.getsource(gui_2.App._gui_func)
+    assert "Session Hub" not in source, "Session Hub window should be removed"
+
+
+def test_discussion_hub_has_snapshot_tab():
+    import src.gui_2 as gui_2
+
+    source = inspect.getsource(gui_2.App._gui_func)
+    assert "Snapshot" in source, "Discussion Hub should have Snapshot tab"
+    assert "_render_snapshot_tab" in source, "Discussion Hub should call _render_snapshot_tab"
+
+
+def test_discussion_hub_has_context_composition_placeholder():
+    import src.gui_2 as gui_2
+
+    source = inspect.getsource(gui_2.App._gui_func)
+    assert "Context Composition" in source, (
+        "Discussion Hub should have Context Composition tab placeholder"
+    )
+
+
+def test_discussion_hub_has_takes_tab():
+    import src.gui_2 as gui_2
+
+    source = inspect.getsource(gui_2.App._gui_func)
+    assert "Takes" in source, "Discussion Hub should have Takes tab"
+
+
+def test_show_windows_no_session_hub():
+    import src.app_controller as app_controller
+
+    source = inspect.getsource(app_controller.AppController)
+    assert "Session Hub" not in source, (
+        "Session Hub should be removed from show_windows"
+    )