source: DataSource, Frame, SourceConfig and the registry (unused yet)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/model.hpp

@@ -24,6 +24,13 @@
 
 namespace udpscope {
 
+/// `SignalInfo::time_mode` values. They equal the wire protocol's `UDPS_TIME_*`
+/// (`udps_source.cpp` static_asserts it), but the model must not name a source's own header.
+constexpr std::uint8_t kTimePacket = 0;
+constexpr std::uint8_t kTimeFullArray = 1;
+constexpr std::uint8_t kTimeFirstSample = 2;
+constexpr std::uint8_t kTimeLastSample = 3;
+
 /// One streamed signal, as the CONFIG packet described it.
 struct SignalInfo {
   std::string name;