Route startup storage paths through platform services

docs/modernization/build-inventory.md

@@ -445,10 +445,11 @@ Known local toolchain state:
   live clipboard get/set requests consume the same contracts before retained
   platform clipboard bridges.
 - `pp_platform_api` exposes the SDK-free `PlatformServices` interface for
-  clipboard text, cursor visibility, virtual-keyboard visibility, external
-  file display, file sharing, native app/window close, UI-thread lifecycle
-  hooks, render-context lifecycle hooks, render-capture frame hooks, per-frame
-  platform hooks, picker callbacks, and prepared-file save/download handoff;
+  startup storage path preparation, clipboard text, cursor visibility,
+  virtual-keyboard visibility, external file display, file sharing, native
+  app/window close, UI-thread lifecycle hooks, render-context lifecycle hooks,
+  render-capture frame hooks, per-frame platform hooks, picker callbacks, and
+  prepared-file save/download handoff;
   Windows
   live app execution now uses injected
   `WindowsPlatformServices` from

docs/modernization/debt.md

@@ -35,7 +35,7 @@ agent or engineer to remove them without reconstructing context from chat.
 | DEBT-0014 | Open | Modernization | `windows-clangcl-asan` now configures as a headless Ninja/clang-cl preset and uses the release MSVC runtime required by ASan, but local builds still fail because installed clang-cl 18.1.8 is paired with VS 2026-preview STL headers that require Clang 20 or newer | Sanitizer validation should be local and repeatable, but this machine's compiler/header pairing is incompatible | `cmake --fresh --preset windows-clangcl-asan`; `cmake --build --preset windows-clangcl-asan --target pp_foundation` | Install/use Clang 20+ with the VS 2026 STL, or point the preset at a compatible VS 2022 toolchain, then make `platform-build.ps1 -Presets windows-clangcl-asan` pass for the headless matrix |
 | DEBT-0015 | Open | Modernization | Cursor visibility requests now consume pure `pp_app_core` planning through `pano_cli plan-cursor-visibility`, `App::show_cursor`/`App::hide_cursor` dispatch through `PlatformServices` without platform guards, and Windows live execution uses injected `WindowsPlatformServices`, but macOS cursor execution still reaches the retained fallback adapter | Keep canvas cursor behavior stable while platform shells are extracted incrementally | `pp_app_core_document_platform_io_tests`; `pano_cli plan-cursor-visibility --visible`; `ctest --preset desktop-fast --build-config Debug` | Cursor visibility execution is owned by injected `pp_platform_*` services for every supported platform |
 | DEBT-0016 | Open | Modernization | Clipboard get/set requests now consume pure `pp_app_core` planning through `pano_cli plan-clipboard-read` and `pano_cli plan-clipboard-write`, and Windows live execution uses injected `WindowsPlatformServices`, but Apple/Android clipboard execution still reaches retained fallback adapter branches from `App::clipboard_get_text` and `App::clipboard_set_text` | Keep picker/color text clipboard behavior stable while platform shells are extracted incrementally | `pp_app_core_document_platform_io_tests`; `pano_cli plan-clipboard-write --text #ff00aa`; `ctest --preset desktop-fast --build-config Debug` | Clipboard execution is owned by injected `pp_platform_*` services for every supported platform |
-| DEBT-0017 | Open | Modernization | `App::clipboard_get_text`, `App::clipboard_set_text`, `App::show_cursor`, `App::hide_cursor`, `App::showKeyboard`, `App::hideKeyboard`, `App::display_file`, `App::share_file`, native app/window close, UI-thread lifecycle hooks, render-context acquire/release/present hooks, render-capture frame hooks, per-frame platform hooks, `App::pick_image`, `App::pick_file`, the non-writer `App::pick_file_save`, `App::pick_dir`, and prepared-file save/download handoff now call the SDK-free `pp::platform::PlatformServices` interface, and Windows injects `WindowsPlatformServices` from `src/platform_windows/windows_platform_services.*`; non-Windows live implementations still use `src/platform_legacy/legacy_platform_services.*`, a named fallback adapter that forwards to retained Apple/Android/Linux/Web bridge functions and retained no-op branches | Preserve behavior while moving platform execution behind a testable service boundary before platform shell implementations are injected | `pp_platform_api_tests`; `pp_app_core_document_platform_io_tests`; `ctest --preset desktop-fast --build-config Debug`; `powershell -ExecutionPolicy Bypass -File scripts\automation\package-smoke.ps1 -Preset windows-msvc-default -Configuration Debug` | Replace `src/platform_legacy/legacy_platform_services.*` with injected `pp_platform_*` service implementations owned by each non-Windows platform shell |
+| DEBT-0017 | Open | Modernization | Startup storage path preparation, `App::clipboard_get_text`, `App::clipboard_set_text`, `App::show_cursor`, `App::hide_cursor`, `App::showKeyboard`, `App::hideKeyboard`, `App::display_file`, `App::share_file`, native app/window close, UI-thread lifecycle hooks, render-context acquire/release/present hooks, render-capture frame hooks, per-frame platform hooks, `App::pick_image`, `App::pick_file`, the non-writer `App::pick_file_save`, `App::pick_dir`, and prepared-file save/download handoff now call the SDK-free `pp::platform::PlatformServices` interface, and Windows injects `WindowsPlatformServices` from `src/platform_windows/windows_platform_services.*`; non-Windows live implementations still use `src/platform_legacy/legacy_platform_services.*`, a named fallback adapter that forwards to retained Apple/Android/Linux/Web bridge functions and retained no-op branches | Preserve behavior while moving platform execution behind a testable service boundary before platform shell implementations are injected | `pp_platform_api_tests`; `pp_app_core_document_platform_io_tests`; `ctest --preset desktop-fast --build-config Debug`; `powershell -ExecutionPolicy Bypass -File scripts\automation\package-smoke.ps1 -Preset windows-msvc-default -Configuration Debug` | Replace `src/platform_legacy/legacy_platform_services.*` with injected `pp_platform_*` service implementations owned by each non-Windows platform shell |
 
 ## Closed Debt
 

docs/modernization/roadmap.md

@@ -469,10 +469,10 @@ cursor bridges continue.
 app-core clipboard text decisions used by live clipboard get/set requests
 before retained platform clipboard bridges continue.
 `pp_platform_api` now owns a headless `PlatformServices` interface for
-clipboard text, cursor visibility, virtual-keyboard visibility, UI-thread
-lifecycle hooks, render-context acquire/release/present hooks, render-capture
-frame hooks, external file display, file sharing, image/file/save-file
-pickers, and directory pickers.
+startup storage path preparation, clipboard text, cursor visibility,
+virtual-keyboard visibility, UI-thread lifecycle hooks, render-context
+acquire/release/present hooks, render-capture frame hooks, external file
+display, file sharing, image/file/save-file pickers, and directory pickers.
 Windows installs an injected `WindowsPlatformServices` implementation from
 `src/platform_windows/windows_platform_services.*` in `pp_platform_windows`;
 other platforms still route through the debt-tracked legacy fallback adapter
@@ -504,6 +504,10 @@ shells are injected.
 Windows RenderDoc frame capture hooks now also dispatch through
 `PlatformServices`, keeping capture integration in the platform service while
 leaving non-Windows adapters as no-ops.
+Startup data/work/recording/temp path preparation now dispatches through
+`PlatformServices`, with Windows creating the Documents/PanoPainter folder
+tree in `WindowsPlatformServices` and Apple/Linux/Web behavior preserved in the
+legacy adapter until platform shells are injected.
 `pano_cli plan-cloud-upload` exposes the app-core cloud upload decision used by
 the live cloud upload command for missing-canvas, new-document warning, publish
 prompt, and dirty-document save-before-upload states before legacy UI, canvas,
@@ -1015,13 +1019,13 @@ Results:
   `pano_cli_plan_clipboard_write_empty_smoke` passed and expose app-core
   clipboard decisions as JSON, including empty write text.
 - `pp_platform_api_tests` passed, covering the SDK-free `PlatformServices`
-  interface for clipboard read/write, empty clipboard writes, cursor
-  visibility dispatch, virtual-keyboard visibility dispatch, external file
-  display dispatch, file sharing dispatch, native app/window close dispatch,
-  UI-thread lifecycle dispatch, render-context lifecycle dispatch,
-  render-capture frame hook dispatch, per-frame platform hook dispatch, picker
-  callback dispatch, and prepared-file save/download callback dispatch. The
-  live Windows app now
+  interface for startup storage path preparation, clipboard read/write, empty
+  clipboard writes, cursor visibility dispatch, virtual-keyboard visibility
+  dispatch, external file display dispatch, file sharing dispatch, native
+  app/window close dispatch, UI-thread lifecycle dispatch, render-context
+  lifecycle dispatch, render-capture frame hook dispatch, per-frame platform
+  hook dispatch, picker callback dispatch, and prepared-file save/download
+  callback dispatch. The live Windows app now
   consumes this interface through an injected
   `WindowsPlatformServices` instance isolated in
   `src/platform_windows/windows_platform_services.*`; other platforms still