Replace upstream model card with a short one describing this repo

#3

The README was a verbatim copy of Google's DiffusionGemma card, which does not say what this repo changes. Replaced with a short card covering:

  • weights are unmodified; the only intended difference is chat_template.jinja
  • what actually switches thinking on (the <|think|> system marker), and that pre-filling <|channel>thought in the generation prompt duplicates a token the model emits itself
  • the caveat that the marker is necessary but not sufficient: on 14 held-out prompts the base model still produced an empty thought block every time
  • the abandoned sriq-sft-v1.5 LoRA attempt, with the measured numbers and why it likely failed
  • two practical notes (do not merge the adapter; needs a transformers build with the DiffusionGemma classes)

See also the chat template fix in PR #2.

kaivoss changed pull request status to merged

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