BIOS detection should rely on core-level identification

Is there an existing issue for this?

• This is a bug in RetroArch frontend
• I have searched the existing issues

Description

Example. RetroArch is configured to recognize the following BIOS files for PlayStation cores:

• scph5500.bin
• scph5501.bin
• scph5502.bin

Expected behavior

RetroArch should automatically identify the BIOS file used by the core (SCPH5501.BIN in this case), displaying it under Main Menu → Information → Core Information as follows:

Present, Optional: SCPH5501.BIN (PS1 US BIOS)

Steps to reproduce the bug

• Rename scph5501.bin to SCPH5501.BIN
• Place SCPH5501.BIN in RetroArch System Directory
• Open RetroArch
• Main Menu → Load Core → Sony - PlayStation (SwanStation)
• Main Menu → Load Content → 240pTestSuitePS1-EMU.cue → Sony - PlayStation (SwanStation) — the BIOS functions correctly in SwanStation because the core identifies and loads the BIOS files using their MD5 checksum or a similar method; You can rename it to SCPH5501-TEST.BIN and it will still be loaded by SwanStation.
• But RetroArch complains in: Main Menu → Information → Core Information

Version/Commit

1.22.2

Bisect Results

No response

Present in the nightly version

I don't know

Platform & operating system

Trisquel

Affected Cores

Environment information

• Flatpak

Relevant log output

Start by reproducing the issue through Main Menu → Information → Core Information with SCPH5501.BIN and the Sony - PlayStation (SwanStation) core. Inspect how RetroArch determines BIOS presence versus the core's checksum-based identification. Done means Core Information reports SCPH5501.BIN as present and optional when the core can load it despite its filename.