Centralize legacy document session bridge

docs/modernization/roadmap.md

@@ -733,6 +733,12 @@ behind the renderer boundary.
 unsaved-project discard prompts, project open, layer refresh, title updates,
 and history clearing while those live effects remain tracked under
 `DEBT-0039`.
+`App::request_close`, `App::save_document`, and
+`App::continue_document_workflow_after_optional_save` now route through
+app-core document-session executors and `src/legacy_document_session_services.*`,
+preserving close prompts, save dialogs, save-version routing, existing-project
+save execution, and dirty-workflow save-before-continue prompts while retained
+legacy UI/canvas behavior remains tracked under `DEBT-0040`.
 
 Implementation tasks:
 
@@ -1272,6 +1278,15 @@ Results:
 - Focused document-open CTest coverage passed for
   `pp_app_core_document_route_tests`, `pp_app_core_document_session_tests`, and
   the `pano_cli_plan_open_route_*` smoke tests after the live bridge split.
+- `PanoPainter`, `pp_app_core_document_session_tests`, and `pano_cli` built
+  after close request, document save, and dirty-workflow continuation execution
+  moved behind document-session services. A clean rebuild was required once
+  because MSVC reported the known Debug PDB `LNK1103` corruption, after which
+  the build passed.
+- Focused document-session CTest coverage passed for
+  `pp_app_core_document_session_tests`, `pano_cli_simulate_app_session_*`, and
+  `pano_cli_plan_document_file/version_*` smoke tests after the live bridge
+  split.
 - `pp_app_core_document_recording_tests` passed, covering recording start/stop,
   clear, platform recorded-file cleanup, frame-count reset, export progress
   totals, and oversized progress-total clamping.