- ViewerOutput owns timeline markers/work area via refcounted
OakTimeline* value handles (oaktimeline_*_create) instead of C++
objects
- oaktimeline C API: add marker_list_create/marker_add/
workarea_create/workarea_set_enabled; handle boxes gain an optional
deleter for owning handles
- oaknode_node_get_markers/get_work_area return addref'd OakTimeline*
handles via out params (named-struct forward declarations avoid the
public header cycle); drop OakNodeMarkerList/OakNodeWorkArea
- serializers 210528-230220 load/save markers and work areas through
the oaktimeline C API; SerializedMarker POD replaces
std::vector<TimelineMarker*> in the serializer interface
- Sequence::add_default_nodes uses oaktimeline_add_track_command
- clip.cpp display-mode enums come from the new neutral
include/timeline/displaymode.h; delete src/node/transition/timeline
- oakcommon xml: add oakcommon_xml_reader/writer_wrap_native borrowed
wrappers (C++ adapter use)
- liboaknode now has zero C++ symbol references into liboaktimeline
Tests: new owning-handle and wrap_native cases; all standalone trees
green (common 196, codec 22, audio 40, task 110, render 49,
timeline 123, node 96, plugin 100).