pub const TAG_VCODE: u8 = 0x0B;Expand description
Vector fingerprint (2g): 0x0B | field | id -> [norm f32-LE][packed code].
Its own keyspace so nearest scans codes ONLY – never the 6KB vectors.
Codes of different fields are different WIDTHS (the width follows the
field’s dimension), so the field must be in the key: a scan that mixed
them would decode one field’s bytes with another field’s recipe.