fix: state standalone versions from their code

Each standalone profile records where its version is read: the source
at its pin (clk 2026-07-23-136-g9020107, shadps4 0.20.1 WIP, eden
v0.2.0-401-g26a03d2), the APK, binary or archive read (kind package),
or, where no reading can be made, kind unverified with the reason: a
host the tools cannot read, a forge gone or not answering, no build
recorded as read, a pin on another branch. Those keep their value,
unconfirmed.

emulators/dgen.yml

@@ -5,6 +5,9 @@ source: "https://sourceforge.net/p/dgen/dgen"
 profiled_date: "2026-10-20"
 source_commit: "1c196e63d3e35704a97a2cef60def9df3c9fd1ce"
 core_version: "1.33"
+version_basis:
+  kind: unverified
+  why: host_unsupported
 display_name: "Sega - Mega Drive - Genesis (DGen/SDL)"
 mode: standalone
 cores: