feat(temporal-model-explorer): register vit_dinov2_finetune_stabilized variant

[Chouffe]

What

Registers the vit_dinov2_finetune_stabilized model in the temporal-model-explorer's params.yaml models: map, so it appears in the viewer's sidebar model selector alongside the existing per-frame vit_dinov2_finetune.

Changes

• params.yaml — add the stabilized variant's source model.zip path.
• dvc.lock — reflects the rescore: prepare_models now copies both zips; run_models scores both models over the sequence store (768 sequences each).

Notes

• No app.py change needed: the stabilized model bakes stabilize: true internally and emits the same details schema, so decisions, tube timeline, and performance cards render faithfully.
• Known caveat: the per-tube crop thumbnails still re-crop from each frame's drifting detection box, not the fixed union_window the stabilized model actually scores. Decisions/metrics are faithful; the crop thumbnails are illustrative only.
• Context: the stabilized A/B was previously unfavorable vs per-frame (doubled FPs at equal recall); this PR is about making the variant browsable in the explorer, not changing any default.