feat(gui): Implement Session Hub and context injection visibility

src/app_controller.py

@@ -243,6 +243,8 @@ class AppController:
   self.ai_status: str = 'idle'
   self.ai_response: str = ''
   self.last_md: str = ''
+  self.last_aggregate_markdown: str = ''
+  self.last_resolved_system_prompt: str = ''
   self.last_md_path: Optional[Path] = None
   self.last_file_items: List[Any] = []
   self.send_thread: Optional[threading.Thread] = None
@@ -2516,6 +2518,11 @@ class AppController:
   # Build discussion history text separately
   history = flat.get("discussion", {}).get("history", [])
   discussion_text = aggregate.build_discussion_text(history)
+  
+  csp = filter(bool, [self.ui_global_system_prompt.strip(), self.ui_project_system_prompt.strip()])
+  self.last_resolved_system_prompt = "\n\n".join(csp)
+  self.last_aggregate_markdown = full_md
+  
   return full_md, path, file_items, stable_md, discussion_text
 
  def _cb_plan_epic(self) -> None:

src/gui_2.py

@@ -214,6 +214,7 @@ 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 = ""
@@ -322,7 +323,15 @@ class App:
 
  @ui_file_paths.setter
  def ui_file_paths(self, paths: list[str]) -> None:
-  self.files = [models.FileItem(path=p) for p in paths]
+  old_files = {f.path: f for f in self.files if hasattr(f, 'path')}
+  new_files = []
+  now = time.time()
+  for p in paths:
+   if p in old_files:
+    new_files.append(old_files[p])
+   else:
+    new_files.append(models.FileItem(path=p, injected_at=now))
+  self.files = new_files
 
  @property
  def ui_screenshot_paths(self) -> list[str]:
@@ -849,6 +858,8 @@ 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:
@@ -2087,6 +2098,29 @@ class App:
   if self.perf_profiling_enabled: self.perf_monitor.end_component("_render_diagnostics_panel")
   imgui.end()
 
+ def _render_session_hub(self) -> None:
+  if self.show_windows.get('Session Hub', False):
+   exp, opened = imgui.begin('Session Hub', self.show_windows['Session Hub'])
+   self.show_windows['Session Hub'] = bool(opened)
+   if exp:
+    if imgui.begin_tab_bar('session_hub_tabs'):
+     if imgui.begin_tab_item('Aggregate MD')[0]:
+      if imgui.button("Copy"):
+       imgui.set_clipboard_text(self.last_aggregate_markdown)
+      imgui.begin_child("last_agg_md", imgui.ImVec2(0, 0), True)
+      markdown_helper.render(self.last_aggregate_markdown, context_id="session_hub_agg")
+      imgui.end_child()
+      imgui.end_tab_item()
+     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")
+      imgui.end_child()
+      imgui.end_tab_item()
+     imgui.end_tab_bar()
+   imgui.end()
+
  def _render_markdown_test(self) -> None:
   imgui.text("Markdown Test Panel")
   imgui.separator()
@@ -2397,6 +2431,22 @@ def hello():
      if ts_str:
       imgui.same_line()
       imgui.text_colored(vec4(120, 120, 100), str(ts_str))
+      # Visual indicator for file injections
+      e_dt = project_manager.parse_ts(ts_str)
+      if e_dt:
+       e_unix = e_dt.timestamp()
+       next_unix = float('inf')
+       if i + 1 < len(self.disc_entries):
+        n_ts = self.disc_entries[i+1].get("ts", "")
+        n_dt = project_manager.parse_ts(n_ts)
+        if n_dt: next_unix = n_dt.timestamp()
+       injected_here = [f for f in self.files if hasattr(f, 'injected_at') and f.injected_at and e_unix <= f.injected_at < next_unix]
+       if injected_here:
+        imgui.same_line()
+        imgui.text_colored(vec4(100, 255, 100), f"[{len(injected_here)}+]")
+        if imgui.is_item_hovered():
+         tooltip = "Files injected at this point:\n" + "\n".join([f.path for f in injected_here])
+         imgui.set_tooltip(tooltip)
      if collapsed:
       imgui.same_line()
       if imgui.button("Ins"):

src/models.py

@@ -357,12 +357,14 @@ class FileItem:
  path: str
  auto_aggregate: bool = True
  force_full: bool = False
+ injected_at: Optional[float] = None
 
  def to_dict(self) -> Dict[str, Any]:
   return {
    "path": self.path,
    "auto_aggregate": self.auto_aggregate,
    "force_full": self.force_full,
+   "injected_at": self.injected_at,
   }
 
  @classmethod
@@ -371,6 +373,7 @@ class FileItem:
    path=data["path"],
    auto_aggregate=data.get("auto_aggregate", True),
    force_full=data.get("force_full", False),
+   injected_at=data.get("injected_at"),
   )
 
 @dataclass