Update: clarifies PCT candidates

[suspect15]

Clarifies which type of hashes the PCT program permits.

[greptile-apps]

Greptile Summary

Adds a new section clarifying which patch types are eligible for Player Compatibility Testing, prioritizing language translation patches and listing other acceptable types (photosensitivity, QoL, widescreen, expanded save slots) while explicitly excluding graphical/cosmetic patches.

Confidence Score: 5/5

Documentation-only addition with no logic changes; safe to merge.

A single new paragraph clarifying eligible hash types. No typos detected, no factual contradictions with existing content.

No files require special attention.

_{Reviews (2): Last reviewed commit: "Update docs/guidelines/content/player-co..." | Re-trigger Greptile}