Add document export CLI automation

docs/modernization/build-inventory.md

@@ -120,6 +120,9 @@ Known local toolchain state:
 - `pp_document_ppi_export_tests` exports pure `pp_document` metadata,
   per-layer frame durations, and RGBA8 face payloads to PPI bytes through
   `pp_assets`, then decodes and reimports them for round-trip coverage.
+- `pano_cli simulate-document-export` exposes the same pure document-to-PPI
+  export, asset-level decode, and document reimport path through JSON
+  automation and is covered by `pano_cli_simulate_document_export_smoke`.
 - `pano_cli load-project` creates a `pp_document` projection with per-layer
   frame counts, durations, and decoded face-pixel payloads when present; the
   metadata-only minimal fixture remains covered by
@@ -301,6 +304,8 @@ Known local toolchain state:
 - `pp_document::export_ppi_project_document` exposes pure document-to-PPI byte
   export through CTest coverage; legacy Canvas save integration remains a
   future DEBT-0010/DEBT-0013 task.
+- `pano_cli simulate-document-export` exposes document export round-trip state
+  through JSON automation for agent-driven checks.
 - `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.