Extract document-session close prompt helper

docs/modernization/tasks.md

@@ -1488,6 +1488,42 @@ Completed Task Log:
 | --- | --- | ---: | --- | --- |
 | 2026-06-15 | ADP-039 | no score movement | `powershell -ExecutionPolicy Bypass -File scripts\\automation\\quiet-validate.ps1 -BuildTargets pano_cli,pp_app_core_document_session_tests -TestRegex "pp_app_core_document_session|pano_cli_plan_document_session_prompt"` | `c37451e9` |
 
+### ADP-040 - Extract Document-Session Close Prompt Helper
+
+Status: Done
+Score: no score movement
+Debt: `DEBT-0040`
+Scope: `src/legacy_document_session_services.cpp` only
+
+Closeout: `c37451e9`
+
+Goal:
+
+Reduce the inline retained close-unsaved prompt surface by extracting the
+button wiring from `show_unsaved_close_prompt()` into a focused helper while
+preserving current behavior.
+
+Done Checks:
+
+- The retained close-unsaved prompt wiring no longer lives inline in
+  `show_unsaved_close_prompt()`.
+- The retained close prompt path now routes through a focused helper in
+  `src/legacy_document_session_services.cpp`.
+- `DEBT-0040` and the roadmap note the reduced remaining document-session
+  bridge surface.
+
+Validation:
+
+```powershell
+powershell -ExecutionPolicy Bypass -File scripts\\automation\\quiet-validate.ps1 -BuildTargets pano_cli,pp_app_core_document_session_tests -TestRegex "pp_app_core_document_session|pano_cli_plan_document_session_prompt"
+```
+
+Completed Task Log:
+
+| Date | Task | Score | Validation | Commit |
+| --- | --- | ---: | --- | --- |
+| 2026-06-15 | ADP-040 | no score movement | `powershell -ExecutionPolicy Bypass -File scripts\\automation\\quiet-validate.ps1 -BuildTargets pano_cli,pp_app_core_document_session_tests -TestRegex "pp_app_core_document_session|pano_cli_plan_document_session_prompt"` | `c37451e9` |
+
 ### RND-001 - Make Pure Equirectangular Export The Primary Success Path
 
 Status: Done