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_sms.yml

@@ -1,8 +1,55 @@
-emulator: "emux_sms"
-type: alias
-alias_of: "gearsystem"
-profiled_date: "2026-03-18"
+emulator: "emux (SMS)"
+type: libretro
+source: "https://github.com/libretro/emux"
+profiled_date: "2026-03-19"
 core_version: "0.1"
 display_name: "Sega - Master System (Emux SMS)"
-note: "This core uses the same BIOS/firmware as gearsystem. See emulators/gearsystem.yml for details."
-files: []
+cores:
+  - emux_sms
+systems:
+  - sms
+
+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 GearSystem. Completely different codebase.
+
+  BIOS loading in controllers/mapper/sms_mapper.c:
+    static char *bios_path = "bios.sms";  (line 33)
+    #define BIOS_SIZE 0x2000              (line 7, 8192 bytes)
+    sms_mapper->bios = file_map(PATH_SYSTEM, bios_path, 0, BIOS_SIZE);
+  If file_map returns NULL, init returns false — core cannot start.
+  No HLE fallback, no skip logic.
+
+  BIOS enable/disable via slot control register port write (lines 74-90):
+    bios_disable bit in control union. Reset clears bios_disable and
+    adds BIOS region to memory map. Writing bios_disable=1 removes
+    the BIOS overlay, exposing cartridge ROM underneath.
+
+  Cartridge loading delegated to sega_mapper controller:
+    ROM mapped via file_map(PATH_DATA, ...), 16 KB banks (BANK_SIZE=0x4000),
+    3 bank slots (NUM_BANKS=3), bank select registers at 0xFFFD-0xFFFF.
+
+  Memory map from mach/sms.c:
+    0x0000-0xBFFF  Mapper (BIOS overlay + cartridge ROM banks)
+    0xC000-0xDFFF  RAM (8 KB)
+    0xE000-0xFFFF  RAM mirror
+
+  The .info declares firmware_count=1, firmware0_opt=false.
+  is_experimental=true. No save states, rewind, or netplay support.
+  Supported extensions: sms, bms, bin, rom.
+
+  system_directory obtained via RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY
+  (libretro/libretro.c:23-25), passed as "system-dir" config param.
+  BIOS loaded from this directory via PATH_SYSTEM.
+
+files:
+  - name: "bios.sms"
+    system: sms
+    description: "Sega Master System BIOS"
+    required: true
+    size: 8192
+    md5: "840481177270d5642a14ca71ee72844c"
+    source_ref: "controllers/mapper/sms_mapper.c:7 (BIOS_SIZE=0x2000), :33 (bios_path), :167-172 (file_map)"
+    note: "Mapped at 0x0000, overlays cartridge ROM until bios_disable bit set in slot control register. No HLE — core fails to init without this file."