FBS Working Schemas

• EndField.fbs: baseline schema from extracted game files.
• EndField.gen0.fbs: alternate baseline copy from gen0.
• FBStreamingChunkVariant8.fbs: provisional 8-field fallback schema inferred from fb_* files where legacy FBDynamicSceneChunkData decode fails the version gate.
• FBStreamingChunkVariant8Bytes.fbs: alternate probe schema that keeps all vectors as ubyte.

These variant schemas are intentionally conservative and may be revised as more fields are fully identified.