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/beebem.yml

@@ -6,6 +6,10 @@ upstream: "https://github.com/stardot/beebem-windows"
 profiled_date: "2026-08-11"
 source_commit: "a982ba6a74af09e801c296b29d514dbd4da09b94"
 core_version: "4.19"
+version_basis:
+  kind: file
+  path: "Src/Version.h"
+  pattern: '#define\s+VERSION_STRING\s+"([^"]+)'
 display_name: "Acorn - BBC Micro (BeebEm)"
 cores: [beebem]
 systems: