Index PPI project layers

docs/modernization/build-inventory.md

@@ -97,8 +97,9 @@ Known local toolchain state:
 - `pano_cli inspect-image` reports PNG IHDR metadata as JSON and is covered by
   `pano_cli_inspect_png_metadata_smoke` with a tiny IHDR fixture.
 - `pano_cli inspect-project` reports validated PPI thumbnail/body byte layout,
-  body summary fields, and dirty-face PNG payload metadata, and is covered by
-  `pano_cli_inspect_project_layout_smoke` with a minimal PPI fixture.
+  body summary fields, layer/frame descriptors, and dirty-face PNG payload
+  metadata, and is covered by `pano_cli_inspect_project_layout_smoke` with a
+  minimal PPI fixture.
 - `pano_cli create-document` supports `--frames` and `--frame-duration-ms` and
   is covered by `pano_cli_create_animation_document_smoke`.
 - `pano_cli simulate-stroke` exposes the pure stroke sampler for scripted

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 but is not yet wired to legacy `Canvas`, PPI load/save, selection masks, 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` | 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` and `pano_cli inspect-project` validate the fixed PPI header, thumbnail/body byte layout, body summary, and dirty-face PNG payload metadata, but do not yet deserialize layer face PNG pixels into document/layer/frame data | Full PPI parsing requires staged extraction of legacy `Canvas` serialization and image/layer payload handling | `ctest --preset desktop-fast --build-config Debug`; `pp_assets_ppi_header_tests`; `pano_cli_inspect_project_layout_smoke` | Full PPI load/save fixtures cover thumbnail, decoded layer face payloads, frames, metadata, corrupt payloads, and round-trip compatibility |
+| DEBT-0013 | Open | Modernization | `pp_assets` and `pano_cli inspect-project` validate the fixed PPI header, thumbnail/body byte layout, layer/frame index, dirty-face descriptors, and dirty-face PNG payload metadata, but do not yet deserialize layer face PNG pixels into document/layer/frame data | Full PPI parsing requires staged extraction of legacy `Canvas` serialization and image/layer payload handling | `ctest --preset desktop-fast --build-config Debug`; `pp_assets_ppi_header_tests`; `pano_cli_inspect_project_layout_smoke` | Full PPI load/save fixtures cover thumbnail, decoded layer face payloads, frames, metadata, corrupt payloads, and 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

@@ -313,8 +313,8 @@ task queue, and deterministic `TraceRecorder` now record
 component/name/thread/frame/stroke metadata with filtering, capacity, and
 invalid-end tests. `pp_assets` has started with PNG/JPEG signature detection,
 PNG IHDR metadata parsing, PPI header/project byte-layout/body-summary
-recognition, dirty-face PNG payload metadata validation, and a pure typed
-settings document model, with
+recognition, layer/frame indexing, dirty-face PNG payload metadata validation,
+and a pure typed settings document model, with
 corrupt/truncated/unsupported, extreme-dimension, and key/value limit tests.
 `pp_paint` has started with pure brush parameter validation/stamp evaluation,
 CPU reference math for the five current shader blend modes, and deterministic
@@ -330,7 +330,7 @@ length parsing, color parsing, tinyxml-backed layout XML parsing, and invalid
 input tests.
 `pano_cli inspect-image` exposes PNG IHDR metadata as JSON,
 `pano_cli inspect-project` reports validated PPI thumbnail/body byte layout,
-body summary, and dirty-face PNG payload metadata, and
+body summary, layer/frame descriptors, and dirty-face PNG payload metadata, and
 `pano_cli create-document` can create simple animation documents with explicit
 frame count/duration, and `pano_cli simulate-stroke` exercises the pure stroke
 sampler for scripted-stroke automation. `pano_cli simulate-stroke-script`
@@ -570,7 +570,8 @@ Results:
 - `pp_assets_image_format_tests` passed.
 - `pp_assets_image_metadata_tests` passed.
 - `pp_assets_ppi_header_tests` passed, including PPI thumbnail/body layout,
-  body summary validation, and dirty-face PNG payload metadata validation.
+  body summary validation, layer/frame indexing, and dirty-face PNG payload
+  metadata validation.
 - `pp_assets_settings_document_tests` passed.
 - `pp_paint_brush_tests` passed.
 - `pp_paint_blend_tests` passed.
@@ -591,8 +592,8 @@ Results:
 - `pano_cli_inspect_png_metadata_smoke` passed and reports PNG metadata JSON
   for the tiny IHDR fixture.
 - `pano_cli_inspect_project_layout_smoke` passed and reports PPI
-  thumbnail/body byte layout, body summary, and dirty-face PNG payload metadata
-  JSON.
+  thumbnail/body byte layout, body summary, layer/frame descriptors, and
+  dirty-face PNG payload metadata JSON.
 - `pano_cli_parse_layout_smoke` passed.
 - `pano_cli_simulate_stroke_smoke` passed and reports deterministic stroke
   sample counts/distances.