Yellow's field.oakSpeech manifest carried only shrink frames, so
OakSpeech.lua's `oakGfx.demoSpecies or "NIDORINO"` fallback fired and
the opening speech showed Nidorino's sprite and cry instead of the
player's Pikachu.
- Stamp demoSpecies "PIKACHU" in the Yellow import manifest (source of
truth for fresh ROM imports and developer builds).
- Stamp it in make_yellow_manifest.py so regeneration keeps the value.
- Repair stale Yellow caches in Data:applyVersionedFieldData() with a
fill-if-absent block, matching the #617 oldManBattle RATTATA pattern.
- Add parity test (manifest carries PIKACHU; stale cache filled;
pre-stamped value left alone).
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Shane McGovern