chore(changes): condense and split pending changelog fragments

- Shorten the Hachidori backend fragment to its user-visible outcomes
- Move the fork submodule note into an internal fragment
- Split stats dashboard history-line mining into its own fixed fragment
- Reclassify the setup launcher label fragment as internal
- Drop the Electron/undici security fragment

changes/hachidori-fork.md

@@ -0,0 +1,4 @@
+type: internal
+area: dictionary
+
+- The bundled Hachidori integration is maintained in a pinned fork submodule using upstream HoshiDicts and WASM binaries.