Preserve per-layer document timelines

docs/modernization/build-inventory.md

@@ -91,8 +91,8 @@ Known local toolchain state:
   `pp_paint`, `pp_document`, `pp_renderer_api`, `pp_paint_renderer`,
   `pp_ui_core`, `pano_cli`, and their current headless test binaries,
   including foundation event/logging/task queue coverage, PNG metadata, PPI
-  header/layout, settings document, document snapshot/frame move/duration coverage,
-  paint brush/stroke/stroke-script coverage, renderer shader descriptor
+  header/layout, settings document, document snapshot/per-layer-frame/move/duration
+  coverage, paint brush/stroke/stroke-script coverage, renderer shader descriptor
   coverage, UI color parsing, and layout XML parse coverage.
 - `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.
@@ -100,8 +100,8 @@ Known local toolchain state:
   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 load-project` creates a metadata-only `pp_document` projection for
-  representable PPI timelines and is covered by
+- `pano_cli load-project` creates a metadata-only `pp_document` projection with
+  per-layer frame counts and durations, and is covered by
   `pano_cli_load_project_metadata_smoke`.
 - `pano_cli create-document` supports `--frames` and `--frame-duration-ms` and
   is covered by `pano_cli_create_animation_document_smoke`.

docs/modernization/debt.md

@@ -28,7 +28,7 @@ agent or engineer to remove them without reconstructing context from chat.
 | DEBT-0007 | Open | Modernization | `vcpkg.json` and `windows-msvc-vcpkg-headless` are validated for the headless Windows component matrix, but app targets still use vendored libraries and Android/Apple triplets are not proven | Dependency migration must stay incremental while SDK/patched/vendor dependencies remain in use | `$env:VCPKG_ROOT="C:\Program Files\Microsoft Visual Studio\2022\Community\VC\vcpkg"; cmake --preset windows-msvc-vcpkg-headless`; `ctest --preset desktop-fast-vcpkg --build-config Debug` | Component targets consume vcpkg packages where reliable and desktop app, Android, and Apple triplets are validated or explicitly documented as permanent vendor exceptions |
 | DEBT-0008 | Open | Modernization | `windows-msvc-default` preset is used for local validation because the VS 2026 generator is not installed here | The target VS 2026 preset must remain, but this machine configures with Visual Studio 17 2022 | `cmake --preset windows-msvc-default`; `ctest --preset desktop-fast --build-config Debug` | Validate `windows-vs2026-x64` on a machine with Visual Studio 2026 installed and make it the default Windows validation preset |
 | DEBT-0009 | Open | Modernization | Android root CMake validation currently builds headless targets only, not APK/package variants | Platform app entrypoints still live in legacy Gradle/CMake projects and need Phase 6 alignment | `powershell -ExecutionPolicy Bypass -File scripts\automation\platform-build.ps1 -Presets android-arm64` | Android standard, Quest, and Focus/Wave package targets consume shared component targets and have package smoke commands |
-| DEBT-0010 | Open | Modernization | `pp_document` is a pure layer/frame/document/undo-history model with alpha-lock metadata and snapshot construction, but it is not yet wired to legacy `Canvas`, PPI pixel 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`; `pano_cli load-project --path tests\data\projects\minimal-project.ppi` | Legacy document behavior is represented by `pp_document` tests and the app consumes it through a boundary/facade |
+| DEBT-0010 | Open | Modernization | `pp_document` is a pure layer/frame/document/undo-history model with alpha-lock metadata, snapshot construction, and per-layer frame metadata, but it is not yet wired to legacy `Canvas`, PPI pixel 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`; `pano_cli load-project --path tests\data\projects\minimal-project.ppi` | 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`, and metadata-only `pano_cli load-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`; `pano_cli_load_project_metadata_smoke` | Full PPI load/save fixtures cover thumbnail, decoded layer face payloads, frames, metadata, corrupt payloads, and round-trip compatibility |

docs/modernization/roadmap.md

@@ -321,8 +321,8 @@ CPU reference math for the five current shader blend modes, and deterministic
 stroke spacing/interpolation plus a pure text stroke-script parser.
 `pp_document` has
 started with a pure canvas/layer/frame model, alpha-lock metadata, snapshot
-construction, layer metadata operations, frame move/duration queries, and
-layer/frame/undo-redo history invariant tests.
+construction, per-layer frame metadata, layer metadata operations, frame
+move/duration queries, and layer/frame/undo-redo history invariant tests.
 `pp_renderer_api` has started with renderer-neutral
 texture/readback descriptors and validation tests. `pp_paint_renderer` has
 started with deterministic CPU layer compositing over renderer extents using
@@ -332,8 +332,8 @@ 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, layer/frame descriptors, and dirty-face PNG payload metadata, and
-`pano_cli load-project` creates a metadata-only `pp_document` projection for
-representable PPI timelines.
+`pano_cli load-project` creates a metadata-only `pp_document` projection with
+per-layer frame counts and durations.
 `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`
@@ -581,7 +581,8 @@ Results:
 - `pp_paint_stroke_tests` passed.
 - `pp_paint_stroke_script_tests` passed.
 - `pp_document_tests` passed, including snapshot construction, alpha-lock
-  metadata, frame move, duration, and history invariants.
+  metadata, per-layer frame metadata, frame move, duration, and history
+  invariants.
 - `pp_renderer_api_tests` passed, including shader descriptor validation.
 - `pp_paint_renderer_compositor_tests` passed.
 - `pp_ui_core_color_tests` passed.
@@ -598,7 +599,8 @@ Results:
   thumbnail/body byte layout, body summary, layer/frame descriptors, and
   dirty-face PNG payload metadata JSON.
 - `pano_cli_load_project_metadata_smoke` passed and reports a metadata-only
-  `pp_document` projection for the minimal PPI fixture.
+  `pp_document` projection with per-layer frame counts and durations for the
+  minimal PPI fixture.
 - `pano_cli_parse_layout_smoke` passed.
 - `pano_cli_simulate_stroke_smoke` passed and reports deterministic stroke
   sample counts/distances.