Add UI core node lifetime handles

docs/modernization/build-inventory.md

@@ -733,6 +733,11 @@ powershell -ExecutionPolicy Bypass -File scripts\automation\apple-remote-build.p
   and platform triplet migration. Root CMake target
   `panopainter_platform_build_vcpkg_ui_core` focuses that gate on the
   vcpkg-backed `pp_ui_core`/tinyxml2 boundary and `pp_ui_core_layout_xml_tests`.
+- `pp_ui_core` now owns a pure `NodeLifetimeTree` target model with checked
+  node handles, hidden parent/child invariants, scoped callback connections,
+  mutation-safe event dispatch, and focused destroy-during-callback coverage in
+  `pp_ui_core_node_lifetime_tests`. Retained `Node` still needs to adopt those
+  semantics under DEBT-0063.
 - `scripts/automation/analyze.*` runs shader validation plus a
   renderer-boundary guard that reports JSON and fails if active non-backend
   source code reintroduces raw `GL_*`/`WGL_*` constants outside the allowed
@@ -1248,8 +1253,9 @@ Known warnings after the current CMake app build:
   `ShaderManager::ext_*` fields directly.
 - `pp_legacy_ui_core` is an object-library containment boundary because the
   retained base `Node` controls still depend on legacy renderer and app
-  headers. It should shrink as layout parsing, colors, generic controls, and
-  text/image primitives move to `pp_ui_core`.
+  headers. It should shrink as layout parsing, colors, generic controls,
+  tested node lifetime handles/connections, and text/image primitives move to
+  `pp_ui_core`.
 - `pp_panopainter_ui` currently surfaces existing legacy `Node`/`Serializer`
   header and static-analysis warnings while it still depends on
   `pp_legacy_app`; these should be reduced as the UI core/app UI boundary is

docs/modernization/debt.md

@@ -441,6 +441,12 @@ agent or engineer to remove them without reconstructing context from chat.
   replaced incrementally by `pp_ui_core` ownership handles, scoped callback
   connections, and mutation-safe dispatch tests before broad panel/dialog
   migration accelerates.
+- 2026-06-06: DEBT-0063 was narrowed. `pp_ui_core::NodeLifetimeTree` now owns a
+  pure checked-handle model for parent/child invariants, subtree destruction,
+  scoped callback disconnection, and mutation-safe dispatch when callbacks
+  destroy the dispatched node or add new connections. Retained `Node` adoption,
+  layout reload coverage, and `pp_panopainter_ui` dialog/popup lifetime tests
+  remain open.
 - 2026-06-05: DEBT-0011 was narrowed. The Windows app package smoke target now
   passes the configure-time CMake executable into `package-smoke.ps1`, so VS
   2026 generator validation does not depend on an older `cmake` on PATH, and
@@ -634,7 +640,7 @@ agent or engineer to remove them without reconstructing context from chat.
 | DEBT-0060 | Open | Modernization | Retained Android package CMake generates a patched `nanort.h` overlay in the build tree for `native-lib` instead of modifying the `libs/nanort` submodule | Current SDK Manager NDK/Clang rejects `TriangleSAHPred::operator=` assigning to a `const size_t` member, but the retained grid/lightmap path still includes `nanort` before that dependency is replaced or updated | `powershell -ExecutionPolicy Bypass -File scripts\automation\android-legacy-package-build.ps1 -Packages standard`; Quest/Focus retained package configure checks; Windows app build | Update/replace `nanort`, move grid/lightmap baking behind a component that owns its dependency, or retire the retained Android package CMake path so no generated vendor overlay is required |
 | DEBT-0061 | Open | Modernization | Desktop XR runtime selection now lives in tested `pp_platform_api` policy and prefers OpenXR, but `WindowsPlatformServices` still reports OpenXR unavailable and reaches the retained OpenVR SDK bridge as a legacy fallback; Windows runtime deployment copies `openvr_api.dll` beside `PanoPainter.exe` until that fallback is removed | Preserve current desktop VR behavior while replacing OpenVR with OpenXR behind the platform/renderer boundary | `pp_platform_api_tests`; `ctest --preset desktop-fast --build-config Debug -R pp_platform_api_tests --output-on-failure`; `cmake --build --preset windows-msvc-default --config Debug --target PanoPainter` | Add an OpenXR SDK/package target, implement desktop OpenXR startup/shutdown/pose/controller submission behind `pp_platform_vr` or `PlatformServices`, validate parity with mocked/runtime smoke coverage, and remove `libs/openvr` plus the OpenVR link/include paths from root CMake |
 | DEBT-0062 | Open | Modernization | VS 2026 builds generate a patched fmt `format.h` overlay in the build tree for `pp_legacy_vendor`, disabling the old `_SECURE_SCL` checked-array iterator branch while leaving the fmt submodule clean | VS 2026's STL no longer exposes the legacy checked-array iterator used by this old fmt release, but replacing fmt is part of the dependency migration rather than this platform unblock | `cmake --build --preset windows-msvc-default --config Debug --target PanoPainter`; `cmake --build --preset windows-msvc-default --config Debug --target pp_platform_api_tests`; `ctest --preset desktop-fast --build-config Debug -R pp_platform_api_tests --output-on-failure` | Move fmt to a supported vcpkg/package version or update the vendored fmt release, then remove the generated fmt overlay from `pp_legacy_vendor` |
-| DEBT-0063 | Open | Modernization | The retained UI tree still exposes `Node* m_parent`, public `std::vector<std::shared_ptr<Node>> m_children`, raw `find<T>()` lookup results, `add_child<T>()` allocation through `new`, callbacks/observers that take or capture raw `Node*`, and manual `destroy()`/`m_destroyed` semantics while `pp_ui_core` only owns parsing/color/layout helpers so far | Preserve current UI behavior while making panel/dialog extraction safe instead of spreading lifetime hazards into the new architecture | `pp_ui_core_layout_xml_tests`; future `pp_ui_core_node_lifetime_tests`; future `pp_panopainter_ui_dialog_lifetime_tests`; `ctest --preset desktop-fast --build-config Debug`; `cmake --build --preset windows-msvc-default --config Debug --target PanoPainter` | `pp_ui_core` owns the UI tree lifetime model with checked node handles or equivalent non-owning references, scoped callback connection/disconnect semantics, mutation-safe event dispatch, parent/child invariants hidden behind APIs, and destroy-during-callback/capture-release/popup-close/layout-reload tests; retained `Node*` APIs are removed or isolated behind compatibility adapters |
+| DEBT-0063 | Open | Modernization | The retained UI tree still exposes `Node* m_parent`, public `std::vector<std::shared_ptr<Node>> m_children`, raw `find<T>()` lookup results, `add_child<T>()` allocation through `new`, callbacks/observers that take or capture raw `Node*`, and manual `destroy()`/`m_destroyed` semantics. `pp_ui_core` now owns a tested `NodeLifetimeTree` target model with checked node handles, scoped callback connections, subtree destruction, and mutation-safe dispatch, but retained `Node` has not adopted it yet | Preserve current UI behavior while making panel/dialog extraction safe instead of spreading lifetime hazards into the new architecture | `pp_ui_core_layout_xml_tests`; `pp_ui_core_node_lifetime_tests`; future `pp_panopainter_ui_dialog_lifetime_tests`; `ctest --preset desktop-fast --build-config Debug`; `cmake --build --preset windows-msvc-default --config Debug --target PanoPainter` | Retained `Node` and `pp_panopainter_ui` adopt checked node handles or equivalent non-owning references, scoped callback connection/disconnect semantics, mutation-safe event dispatch, parent/child invariants hidden behind APIs, and destroy-during-callback/capture-release/popup-close/layout-reload tests; retained `Node*` APIs are removed or isolated behind compatibility adapters |
 | DEBT-0057 | Open | Modernization | Default canvas allocation size now dispatches through `PlatformServices::default_canvas_resolution`, removing the `CANVAS_RES` platform macro from `src/canvas.h`; WebGL's retained 512 default now lives in tested `pp_platform_api::platform_policy`, but the Web shell still reaches it through the legacy platform fallback until injected Web services own the policy | Preserve WebGL memory behavior while moving canvas creation policy out of shared canvas headers and into the platform boundary | `pp_platform_api_tests`; `ctest --preset desktop-fast --build-config Debug -R pp_platform_api_tests`; Windows app build; WebGL package smoke once root Web build exists | Default canvas resolution is owned by injected `pp_platform_*` services for every supported platform, with no WebGL branch in the legacy fallback |
 | DEBT-0058 | Open | Modernization | App-level progress/message/input dialog metadata, including message-dialog OK/cancel captions, now consumes pure `pp_app_core` through `App::show_progress`, `App::message_box`, `App::input_box`, `pano_cli plan-app-dialog`, and `pp_app_core_app_dialog_tests`; live execution is centralized in `src/legacy_app_dialog_services.*`, but the bridge still creates retained `NodeProgressBar`, `NodeMessageBox`, and `NodeInputBox` instances and inserts them into the legacy layout tree | Preserve current app-shell dialog behavior while moving shared dialog policy toward UI/app services | `pp_app_core_app_dialog_tests`; `pano_cli plan-app-dialog --kind progress --total -4`; `pano_cli plan-app-dialog --kind message --cancel`; `pano_cli plan-app-dialog --kind input --ok-caption Save`; `ctest --preset desktop-fast --build-config Debug`; Windows app build | Progress/message/input dialog creation, callback wiring, layout insertion, lifetime ownership, and headless automation are owned by injected app/UI services with `App` methods acting only as adapters |
 | DEBT-0059 | Open | Modernization | iOS root CMake headless builds assign generated bundle identifiers and disable code signing for executable test/tool targets | The current Apple gate is compile validation for shared component targets; signed iOS app/package validation is not migrated to root CMake yet | `powershell -ExecutionPolicy Bypass -File scripts\automation\apple-remote-build.ps1 -Presets macos,ios-simulator,ios-device`; `sh scripts/automation/platform-build.sh "ios-device"` on `panopainter-mac` | Root CMake owns the signed Apple app/package targets, package-smoke validates Apple bundles where signing material is available, and headless iOS test/tool targets are either excluded from signed package builds or use explicit test-runner signing policy |

docs/modernization/roadmap.md

@@ -467,7 +467,11 @@ and lookup pointers, public mutable child ownership, raw callback targets, and
 manual destroy flags. `pp_ui_core` should introduce owned tree/handle APIs,
 scoped callback connections, mutation-safe event dispatch, and focused
 destroy-during-callback tests before broad `NodePanel*`/`NodeDialog*`
-migration accelerates.
+migration accelerates. The first pure `pp_ui_core::NodeLifetimeTree` slice now
+models checked handles, parent/child invariants, scoped callback connections,
+and mutation-safe dispatch for destroy-during-callback and connection-addition
+cases; wiring those semantics into retained `Node` remains tracked by the same
+debt.
 `pano_cli inspect-image` exposes PNG IHDR metadata as JSON,
 `pano_cli import-image` accepts a PNG path and imports decoded RGBA8 pixels
 into a new pure `pp_document` face payload,