Plan clipboard text actions in app core

docs/modernization/roadmap.md

@@ -463,6 +463,9 @@ mobile platform keyboard bridges continue.
 `pano_cli plan-cursor-visibility` exposes the app-core cursor visibility
 decision used by live canvas cursor requests before retained desktop platform
 cursor bridges continue.
+`pano_cli plan-clipboard-read` and `pano_cli plan-clipboard-write` expose the
+app-core clipboard text decisions used by live clipboard get/set requests
+before retained platform clipboard bridges continue.
 `pano_cli plan-cloud-upload` exposes the app-core cloud upload decision used by
 the live cloud upload command for missing-canvas, new-document warning, publish
 prompt, and dirty-document save-before-upload states before legacy UI, canvas,
@@ -954,6 +957,7 @@ Results:
   callbacks, plus empty/non-empty display-file planning before platform
   display callbacks, plus virtual keyboard show/hide planning before platform
   keyboard callbacks, plus cursor visibility planning before platform cursor
+  callbacks, plus clipboard read/write planning before platform clipboard
   callbacks.
 - `pano_cli_plan_picked_path_empty_smoke` and
   `pano_cli_plan_picked_path_selected_smoke` passed and expose app-core picker
@@ -967,6 +971,10 @@ Results:
 - `pano_cli_plan_cursor_visibility_hidden_smoke` and
   `pano_cli_plan_cursor_visibility_visible_smoke` passed and expose app-core
   cursor visibility decisions as JSON.
+- `pano_cli_plan_clipboard_read_smoke`,
+  `pano_cli_plan_clipboard_write_smoke`, and
+  `pano_cli_plan_clipboard_write_empty_smoke` passed and expose app-core
+  clipboard decisions as JSON, including empty write text.
 - `panopainter_validate_shaders` passed, validating 25 shader programs and 7
   shader includes for stage markers and include graph integrity.
 - `pp_renderer_gl_capabilities_tests` passed on default MSVC, vcpkg-headless,