fix: round 2 audit fixes, updated emulator profiles

Scripts:
- fix generate_site nav regex destroying mkdocs.yml content
- fix auto_fetch comma-separated MD5 in find_missing
- fix verify print_platform_result conflating untested/missing
- fix validate_pr path traversal and symlink check
- fix batocera_scraper brace counting and escaped quotes in strings
- fix emudeck_scraper hash search crossing function boundaries
- fix pipeline.py cwd to repo root via Path(__file__)
- normalize SHA1 comparison to lowercase in generate_pack

Emulator profiles:
- emux_gb/nes/sms: reclassify from alias to standalone profiles
- ep128emu: remove .info-only files not referenced in source
- fbalpha2012 variants: full source-verified profiles
- fbneo_cps12: add new profile

emulators/emux_nes.yml

@@ -1,8 +1,51 @@
-emulator: "emux_nes"
-type: alias
-alias_of: "fceumm"
-profiled_date: "2026-03-18"
+emulator: "emux (NES)"
+type: libretro
+source: "https://github.com/libretro/emux"
+profiled_date: "2026-03-19"
 core_version: "0.1"
 display_name: "Nintendo - NES / Famicom (Emux NES)"
-note: "This core uses the same BIOS/firmware as fceumm. See emulators/fceumm.yml for details."
+cores:
+  - emux_nes
+systems:
+  - nes
+
+notes: |
+  emux is a multi-system emulator by Sebastien Ronsse, supporting CHIP-8,
+  Game Boy, NES, and Sega Master System as separate libretro cores.
+
+  NOT an alias of FCEUmm. Completely different codebase.
+  The NES core does not require any BIOS or firmware files.
+  The .info declares no firmware_count.
+
+  The NES has no boot ROM. CPU starts at the reset vector address
+  stored at 0xFFFC-0xFFFD (cpu/rp2a03.c RESET_VECTOR).
+
+  Cartridge loading in controllers/mapper/nes_mapper.c:
+    - iNES header parsed (magic 0x1A53454E)
+    - Mapper number extracted from flags6/flags7
+    - Supported mappers: NROM (0), MMC1 (1), MMC3 (4)
+    - PRG-ROM and CHR-ROM mapped via file_map(PATH_DATA, ...)
+
+  Memory map from mach/nes.c:
+    CPU bus:
+      0x0000-0x07FF  WRAM (2 KB, mirrored to 0x1FFF)
+      0x2000-0x2007  PPU registers (mirrored to 0x3FFF)
+      0x4000-0x4013  APU registers
+      0x4014         Sprite DMA
+      0x4016-0x4017  Controller ports
+      0x6000-0x7FFF  SRAM
+      0x8000-0xFFFF  PRG-ROM
+
+    PPU bus:
+      0x0000-0x1FFF  CHR-ROM/RAM (pattern tables)
+      0x2000-0x2FFF  VRAM (nametables, 4 KB)
+      0x3F00-0x3F1F  Palette RAM
+
+  system_directory obtained via RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY
+  (libretro/libretro.c:23-25) but not used for any file loading.
+
+  is_experimental=true. No save states, rewind, or netplay support.
+  Supported extensions: nes, bin, rom.
+
 files: []
+# No BIOS, firmware, or system files of any kind.