docs: say why emucv and eightyone read nothing

Both cores ask for the system directory. emucv never reads the answer
back, and eightyone serves every ROM from its embedded table and only
writes zxpand-eeprom.bin there. The reasons were in their notes, not in
the exclusion_note the fileless audit accepts as an answer.

emulators/eightyone.yml

@@ -20,6 +20,11 @@ systems:
   - ringo-r470
   - microdigital-tk85
 
+exclusion_note: >
+  The system directory holds eightyone/ROMs, FDCs and IDEs, but every ROM the
+  core requests is served from its embedded table before any path is opened
+  (libretro/eo_roms.cpp:106-128). The one file it touches there is
+  zxpand-eeprom.bin, written when absent (81/Source/zxpand/smbsd.cpp:75-98).
 notes: |
   Recalbox port of EightyOne, vendored under 81/ and built with CMake.
   Machines: ZX80, ZX81, ZX97LE, TS1000, TS1500, TK85, Lambda 8300,

emulators/emucv.yml

@@ -12,6 +12,10 @@ cores:
 systems:
   - epochcv
 
+exclusion_note: >
+  The system directory is asked for and stored (src/core.cpp:362-366), and the
+  helpers that would read it back sit inside comment blocks
+  (src/common.cpp:799-937, src/common.cpp:1095-1719): the answer is never used.
 notes: |
   Cassette Vision emulator written for libretro by Maxime Marconato. The
   console has no system ROM: each cartridge carries the NEC uPD777 (or