Move project save post-commit planning to app core

docs/modernization/build-inventory.md

@@ -307,7 +307,10 @@ powershell -ExecutionPolicy Bypass -File scripts\automation\apple-remote-build.p
   the app-core commit plan for direct saves, successful temporary swaps,
   target-remove failures, and rename-after-remove failures. It is covered by
   forward-slash, Windows backslash, existing-target, remove-failure,
-  rename-failure, and invalid-path smokes.
+  rename-failure, and invalid-path smokes. The same command now reports the
+  app-core post-commit side-effect plan for clean/new-document metadata
+  updates, timelapse sidecar gating, platform flush, progress cleanup, and
+  title refresh.
 - Live equirectangular, layer, animation-frame, and cube-face export adapters
   now prepare and log the same payload-bearing canvas document snapshot plus
   shared paint-renderer export-readiness report.
@@ -1191,7 +1194,10 @@ powershell -ExecutionPolicy Bypass -File scripts\automation\apple-remote-build.p
   delegating to retained `Canvas::project_save`. Direct save, successful
   temporary swap, remove-failure, and rename-after-remove commit outcomes are
   now classified by the same app-core planner before retained success metadata
-  mutation.
+  mutation. Post-commit clean/new-document metadata, timelapse sidecar,
+  platform flush, progress cleanup, and title-refresh decisions also come from
+  `pp_app_core`, while retained code still performs the mutations and sidecar
+  serialization.
   Retained legacy UI/canvas
   execution and actual live save serialization remain tracked by `DEBT-0040`,
   `DEBT-0041`, and `DEBT-0042`; the pure snapshot-to-PPI export handoff is