Both methods have zero call sites anywhere under src/ (grep, excluding vendor).
Comment them out rather than delete (kept as a record), and start a dead-code
index (DEAD_CODE.md) tracking such symbols per file with the verification
command.
Also resolves the last PHPStan level-5 error: generateThumbnail contained an
unreachable 32x64 branch (type 5 is matched earlier); the whole method is dead
regardless, so commenting it out clears the finding. PHPStan is now clean.
