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/model2.yml

@@ -7,6 +7,9 @@ version_source:
   pattern: 'Model 2 Emulator: (\d+\.\d+[a-z]?)'
 profiled_date: "2026-03-26"
 core_version: "1.1a"
+version_basis:
+  kind: unverified
+  why: no_artifact
 display_name: "Model 2 Emulator (Sega Model 2)"
 cores:
   - model2