fix: rename 2.3B → 2.7B (post-subsumination actual count)

rename weights to 0.1-alpha versioning

Delete base/pearl_meta.json with huggingface_hub

Delete base/probe_baseline.json with huggingface_hub

Delete base/weights_step1499.pt with huggingface_hub

rename base/weights_step1500.pt → base/Anvaya-Rabbit-2.3B-base.pt

Upload folder using huggingface_hub