feat(hot-reload): Complete Phase 2 refactor and document UI delegation pattern

conductor/product-guidelines.md

@@ -25,6 +25,7 @@
 - **Comprehensive Logging:** Aggressively log all actions, API payloads, tool calls, and executed scripts. Maintain timestamped JSON-L and markdown logs to ensure total transparency and debuggability.
 - **Mandatory ImGui Verification:** All changes to the GUI (`gui_2.py`) MUST be verified using the custom AST linter (`scripts/check_imgui_scopes.py`) to ensure all ImGui scopes (begin/end, push/pop) are properly matched. Developers should prioritize the use of `src/imgui_scopes.py` context managers (`imscope`) over manual push/pop calls.
 - **Modular Controller Pattern:** To prevent "God Object" bloat in core controllers (like `AppController`), all state-independent or utility logic must be moved to module-level functions. Functions requiring class state should accept the instance as an explicit dependency (`def logic(controller: AppController, ...)`). Massive `if/elif` dispatch blocks must be refactored into handler maps (dictionaries) of module-level functions.
+- **UI Delegation for Hot-Reload:** All complex ImGui rendering logic must be extracted from the `App` class into module-level functions named `render_xxx(app: App)`. The `App` class should only contain thin delegation wrappers (`def _render_xxx(self): render_xxx(self)`). This architecture is mandatory for supporting state-preserving hot-reloads of the UI logic.
 - **Dependency Minimalism:** Limit external dependencies where possible. For instance, prefer standard library modules (like `urllib` and `html.parser` for web tools) over heavy third-party packages.
 
 ## Phase 5: Heavy Curation & Structural Integrity (MANDATORY)