README still describes the pre-rename "PRD" terminology (v4.0.0), while versions/TheAlgorithm_Latest.md is at v6.3.0 and uses "ISA"

The top-level `README.md`'s "How It Works" section still refers to the artifact as a "PRD" and cites v4.0.0 doctrine:

https://github.com/danielmiessler/TheAlgorithm/blob/main/README.md

`versions/TheAlgorithm_v4.1.0.md` shows this was intentionally renamed to "ISA" (with reasons given), and the currently-pinned spec, `versions/TheAlgorithm_Latest.md`, is at v6.3.0 and uses "ISA" throughout:

https://github.com/danielmiessler/TheAlgorithm/blob/main/versions/TheAlgorithm_Latest.md
https://github.com/danielmiessler/TheAlgorithm/blob/main/versions/TheAlgorithm_v4.1.0.md

The README appears to predate the rename and hasn't been updated to match the current pinned version — a new reader landing on the README first would learn outdated terminology. Happy to open a PR syncing the README to Latest.md's terminology if useful.

Confronta la sezione "How It Works" di primo livello di README.md con versions/TheAlgorithm_Latest.md e con la motivazione della ridenominazione in versions/TheAlgorithm_v4.1.0.md. Aggiorna la terminologia obsoleta "PRD" e il riferimento a v4.0.0 in README in modo che corrispondano alla terminologia ISA e alla versione attualmente fissate, quindi verifica che la sezione sia coerente con Latest.md.

Scritto dal modello di indicizzazione a partire dal testo della issue.