fix: place files in a folder a launcher sets

KNULLI sets AetherSX2's [Folders] Bios to bios/ps2
(aethersx2Generator.py:219), yet its 112 PS2 BIOS files went to the
BIOS root. Three causes:

- a record's passes_to was split into words, so "[Folders] Bios"
  could not be told from "[Filenames] BIOS". ini_keys() adds the
  section-qualified key a profile names in standalone_directories.
- scans_dir records hand a folder too (ROCKNIX's bios/armsx2,
  EmuDeck's PCSX2 and ARMSX2) and were not read as handed.
- the agnostic scan looked its seeds up by the id of the profile's
  entries, while it walks the copies platform_layouts makes: any
  bound layout scanned nothing. Copies map back to the profile's
  entries by position.

An agnostic profile's entry the layout reads outside the BIOS tree
is now named by the gap report (outside_bios_folder) instead of
dropped: ARMSX2's arcade/proverb.zip on ROCKNIX and EmuDeck.

scripts/verify.py

@@ -564,15 +564,19 @@ def find_undeclared_files(
         if emu_name not in relevant:
             continue
 
-        # Skip agnostic profiles entirely (filename-agnostic BIOS detection)
-        if profile.get("bios_mode") == "agnostic":
-            continue
+        # A filename-agnostic profile is served by the scan (packextras), all
+        # but the entries its layout reads outside the BIOS tree: those are
+        # named here, or a launcher folder drops them without a word
+        # (ARMSX2's arcade/proverb.zip once ROCKNIX binds bios/armsx2).
+        agnostic = profile.get("bios_mode") == "agnostic"
 
         for profile, is_standalone in platform_layouts(emu_name, profile, standalone_set):
 
             for f in expand_directory_entries(
                 profile.get("files", []), db, is_standalone
             ):
+                if agnostic and not f.get("unplaced"):
+                    continue
                 fname = f.get("name", "")
                 # One destination rule for the dedup key and for the entry: a
                 # standalone build without standalone_path falls back on path.