feat: id discovery

docs/technical/dids.md

@@ -0,0 +1,18 @@
+# Discovered Ids
+
+```c
+primary DiscoveredIds {
+  utf8"DIDS" magic;
+  Header header;
+  primary Body body;
+}
+
+Header {
+  uint16 version; // always 1
+}
+
+Body {
+  uint32 count;
+  uint32[count] ids;
+}
+```