docs: name the registries behind assets and dedup

The guides said files over 50 MB become release assets and that RPG Maker and ScummVM were the trees kept out of dedup. .gitignore decides the first, four committed files are over 50 MB, and NODEDUP_DIRS holds eleven trees.

wiki/architecture.md

@@ -241,7 +241,7 @@ platform's own verification mode.
 | `zippedFile` entries | MD5 is of the ROM inside the ZIP, not the ZIP itself |
 | Regional variants (same filename) | `by_path_suffix` index disambiguates |
 | MAME BIOS ZIPs | `contents` field documents inner structure |
-| RPG Maker/ScummVM | excluded from dedup (NODEDUP) to preserve directory structure |
+| Trees addressed by path (RPG Maker, ScummVM, tzdata, c64-emu and the rest of `NODEDUP_DIRS`) | excluded from dedup to keep files that are equal by design |
 | `strip_components` in data dirs | flattens cache prefix to match expected path |
 | case-insensitive dedup | prevents `font.rom` + `FONT.ROM` conflicts on Windows/macOS |
 | frozen snapshot cores | `.info` may reflect current version while code is pinned to an old one. Only the frozen source at the pinned tag is reliable (e.g. desmume2015, mame2003) |