docs(hot_reload): fix 2 stale claims (example registration + trigger_key)

docs/guide_hot_reload.md

@@ -224,32 +224,23 @@ The error is captured via Python's standard `traceback.format_exc()` and stored
 
 ## Registration
 
-To opt a module into hot reload, register it at module import time:
+To opt a module into hot reload, register it at module import time. The actual registration used by `src/gui_2.py` is at `src/gui_2.py:282-287`:
 
 ```python
 # At the top of src/gui_2.py (or in a separate registration file)
 from src.hot_reloader import HotReloader, HotModule
 
-HotReloader.register(HotModule(
-    name="src.gui_2",
-    file_path="C:/projects/manual_slop/src/gui_2.py",
-    state_keys=[
-        "ai_input",
-        "project_system_prompt",
-        "global_system_prompt",
-        "discussion_history",
-        "selected_files",
-    ],
-    delegation_targets=[
-        "render_main_window",
-        "render_context_panel",
-        "render_ai_settings",
-        "render_discussion_hub",
-        "render_mma_dashboard",
-    ],
-))
+if 'src.gui_2' not in HotReloader.HOT_MODULES:
+    HotReloader.register(HotModule(
+        name='src.gui_2',
+        file_path=__file__,
+        state_keys=['active_discussion', 'show_windows', 'ui_file_paths', 'ui_screenshot_paths', 'disc_entries', 'disc_roles'],
+        delegation_targets=['_render_main_interface', '_render_discussion_hub', '_render_files_and_media', '_render_ai_settings_hub', '_render_operations_hub', '_render_mma_dashboard'],
+    ))
 ```
 
+Note: `delegation_targets` lists the App's `_render_*` wrapper methods (not the module-level `render_*` functions), and `state_keys` are the App attributes actually snapshotted on reload.
+
 **When to register**: At module import time, ideally near the top of the file. The registration is idempotent — calling `register()` twice with the same name raises `ValueError` to prevent accidental double-registration.
 
 **What to put in `state_keys`**: Attributes that:
@@ -267,9 +258,9 @@ For pure-renderer modules that don't touch app state, `state_keys` can be empty.
 
 ### Keyboard Shortcut
 
-`Ctrl+Alt+R` (configurable via `config.toml` → `[hot_reload].trigger_key`).
+`Ctrl+Alt+R` (handler wired in `src/gui_2.py:5340-5346`; not yet a config key — the literal is hard-coded in the source).
 
-The keyboard handler is in `src/gui_2.py` and calls `HotReloader.reload_all(app)`.
+The keyboard handler is `_trigger_hot_reload()` at `src/gui_2.py:540-544`, which calls `HotReloader.reload_all(self)`.
 
 ### GUI Button