Add targeted PPI payload automation

docs/modernization/build-inventory.md

@@ -122,9 +122,11 @@ Known local toolchain state:
   `pano_cli_load_project_metadata_smoke`.
 - `pano_cli save-project` writes generated multi-layer, multi-frame PPI files
   with configurable layer opacity, blend mode, alpha lock, and visibility
-  through `pp_assets` and is covered by `pano_cli_save_project_roundtrip_smoke`
+  through `pp_assets`; test dirty-face payloads can target explicit generated
+  layer/frame slots. It is covered by `pano_cli_save_project_roundtrip_smoke`
   and `pano_cli_save_project_payload_roundtrip_smoke`, which reload generated
-  metadata-only and dirty-face-payload projects through `pano_cli load-project`.
+  metadata-only and targeted dirty-face-payload projects through
+  `pano_cli load-project`.
 - `pano_cli create-document` supports `--frames` and `--frame-duration-ms` and
   is covered by `pano_cli_create_animation_document_smoke`.
 - `pano_cli simulate-document-edits` exercises pure document layer/frame edit
@@ -287,9 +289,10 @@ Known local toolchain state:
   automation and is covered by `pano_cli_export_image_roundtrip_smoke`; full
   legacy canvas export remains a future CLI task.
 - `pano_cli save-project` exposes generated multi-layer, multi-frame PPI
-  writing with layer metadata through JSON automation and is covered by
-  metadata-only and dirty-face-payload round-trip smoke tests; full legacy
-  canvas save parity remains tracked by DEBT-0013.
+  writing with layer metadata and targeted dirty-face layer/frame payloads
+  through JSON automation and is covered by metadata-only and
+  dirty-face-payload round-trip smoke tests; full legacy canvas save parity
+  remains tracked by DEBT-0013.
 - `pp_ui_core` consumes vcpkg tinyxml2 only when `PP_USE_VCPKG_TINYXML2=ON`
   through the vcpkg preset; default and Android validation still use the
   retained vendored fallback tracked by DEBT-0012.

docs/modernization/debt.md

@@ -31,7 +31,7 @@ agent or engineer to remove them without reconstructing context from chat.
 | DEBT-0010 | Open | Modernization | `pp_document` is a pure layer/frame/document/undo-history model with alpha-lock metadata, snapshot construction, per-layer frame metadata, renderer-free RGBA8 face payload storage, and renderer-free alpha8 selection-mask storage, but it is not yet wired to legacy `Canvas`, save, or legacy action commands | Keep extraction incremental while preserving app behavior | `ctest --preset desktop-fast --build-config Debug`; `pano_cli create-document --width 64 --height 32 --layers 2`; `pano_cli load-project --path tests\data\projects\minimal-project.ppi`; `pp_document_ppi_import_tests`; `pano_cli_simulate_document_edits_smoke` | Legacy document behavior is represented by `pp_document` tests and the app consumes it through a boundary/facade |
 | DEBT-0011 | Open | Modernization | `package-smoke` validates the Windows CMake app artifact only, not AppX/APK/Apple/WebGL package outputs | Platform package targets are not migrated to root CMake yet | `powershell -ExecutionPolicy Bypass -File scripts\automation\package-smoke.ps1 -Preset windows-msvc-default -Configuration Debug` | Package-smoke covers Windows AppX, Android APK variants, Apple bundles, and WebGL output where local toolchains are present |
 | DEBT-0012 | Open | Modernization | `pp_ui_core` uses vcpkg tinyxml2 on `windows-msvc-vcpkg-headless`, but retains `pp_vendor_tinyxml2` for default and unproven platform presets | Mobile/AppX/Apple triplets and app packaging still need validation before removing the vendored fallback | `ctest --preset desktop-fast-vcpkg --build-config Debug`; `ctest --preset desktop-fast --build-config Debug`; `powershell -ExecutionPolicy Bypass -File scripts\automation\platform-build.ps1 -Presets android-arm64` | All supported presets consume vcpkg tinyxml2 or document a permanent vendored exception |
-| DEBT-0013 | Open | Modernization | `pp_assets`, `pano_cli inspect-project`, `pano_cli load-project`, and `pano_cli save-project` validate the fixed PPI header, thumbnail/body byte layout, generated multi-layer/multi-frame PPI writing with layer opacity/blend/alpha-lock/visibility metadata, metadata-only and dirty-face-payload save/load round-trips, layer/frame index, dirty-face descriptors, dirty-face PNG payload metadata, asset-level RGBA PNG payload decoding, and decoded pixel attachment to `pp_document`, but full legacy PPI round-trip parity is not yet extracted | Full PPI save parity requires staged extraction of legacy `Canvas` serialization and image/layer payload handling | `ctest --preset desktop-fast --build-config Debug`; `pp_assets_image_pixels_tests`; `pp_assets_ppi_header_tests`; `pp_document_ppi_import_tests`; `pano_cli_inspect_project_layout_smoke`; `pano_cli_load_project_metadata_smoke`; `pano_cli_save_project_roundtrip_smoke`; `pano_cli_save_project_payload_roundtrip_smoke` | Full PPI load/save fixtures cover thumbnails, decoded layer face payloads attached to documents, frames, corrupt payloads, dirty-face payload saving, arbitrary legacy canvas payload/layout combinations, and legacy app round-trip compatibility |
+| DEBT-0013 | Open | Modernization | `pp_assets`, `pano_cli inspect-project`, `pano_cli load-project`, and `pano_cli save-project` validate the fixed PPI header, thumbnail/body byte layout, generated multi-layer/multi-frame PPI writing with layer opacity/blend/alpha-lock/visibility metadata, metadata-only and targeted dirty-face-payload save/load round-trips, layer/frame index, dirty-face descriptors, dirty-face PNG payload metadata, asset-level RGBA PNG payload decoding, and decoded pixel attachment to `pp_document`, but full legacy PPI round-trip parity is not yet extracted | Full PPI save parity requires staged extraction of legacy `Canvas` serialization and image/layer payload handling | `ctest --preset desktop-fast --build-config Debug`; `pp_assets_image_pixels_tests`; `pp_assets_ppi_header_tests`; `pp_document_ppi_import_tests`; `pano_cli_inspect_project_layout_smoke`; `pano_cli_load_project_metadata_smoke`; `pano_cli_save_project_roundtrip_smoke`; `pano_cli_save_project_payload_roundtrip_smoke` | Full PPI load/save fixtures cover thumbnails, decoded layer face payloads attached to documents, frames, corrupt payloads, dirty-face payload saving, arbitrary legacy canvas payload/layout combinations, and legacy app round-trip compatibility |
 | 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 |
 
 ## Closed Debt

docs/modernization/roadmap.md

@@ -347,7 +347,8 @@ payloads are present.
 `pano_cli save-project` writes generated multi-layer, multi-frame PPI files
 with layer opacity, blend mode, alpha lock, and visibility metadata through the
 extracted `pp_assets` writer and round-trips metadata-only and test
-dirty-face-payload variants through `load-project`.
+dirty-face-payload variants through `load-project`; dirty-face payloads can be
+targeted to explicit generated layer/frame slots for animation coverage.
 `pano_cli create-document` can create simple animation documents with explicit
 frame count/duration. `pano_cli simulate-document-edits` exercises pure
 layer metadata, frame reordering, active-index preservation, tiny face-payload
@@ -680,7 +681,8 @@ Results:
   payload rejection.
 - `pp_assets_ppi_header_tests` passed, including PPI thumbnail/body layout,
   body summary validation, layer/frame indexing, dirty-face PNG payload
-  metadata validation, and decoded dirty-face payload coverage.
+  metadata validation, targeted layer/frame dirty-face writing, and decoded
+  dirty-face payload coverage.
 - `pp_assets_settings_document_tests` passed.
 - `pp_paint_brush_tests` passed.
 - `pp_paint_blend_tests` passed.
@@ -725,8 +727,9 @@ Results:
   `pp_assets` PPI writer can save a generated multi-frame PPI and reload it
   through `pano_cli load-project`.
 - `pano_cli_save_project_payload_roundtrip_smoke` passed and proves the
-  `pp_assets` PPI writer can save a compressed RGBA PNG dirty-face payload and
-  reload it as decoded `pp_document` face-pixel data.
+  `pp_assets` PPI writer can save a compressed RGBA PNG dirty-face payload to
+  an explicit layer/frame slot, inspect the serialized descriptor, and reload
+  it as decoded `pp_document` face-pixel data.
 - `pano_cli_parse_layout_smoke` passed.
 - `pano_cli_simulate_stroke_smoke` passed and reports deterministic stroke
   sample counts/distances.
@@ -794,9 +797,10 @@ Results:
   and has a save/import round-trip smoke test. Full legacy canvas export
   remains a future `pano_cli` task.
 - `pano_cli save-project` exposes generated multi-layer, multi-frame PPI
-  writing with layer metadata through JSON automation and is covered by
-  metadata-only and dirty-face-payload save/load round-trip smoke tests. Full
-  legacy canvas save parity remains tracked by DEBT-0013.
+  writing with layer metadata and targeted dirty-face layer/frame payloads
+  through JSON automation and is covered by metadata-only and
+  dirty-face-payload save/load round-trip smoke tests. Full legacy canvas save
+  parity remains tracked by DEBT-0013.
 - PowerShell package-smoke wrapper validates the Windows CMake app executable
   and runtime `data/` copy.
 - Android arm64 configured with NDK 29.0.14206865 through the platform-build