docs: remove campaign-notes link (repo private)

README.md

@@ -92,12 +92,6 @@ Files: `model.safetensors` (weights), `config.json` (architecture + heads),
 `tokenizer/ogma_sp.model` (sentencepiece), `ogma/` (vendored model code),
 `ogma_libre.py` (loader).
 
-## Campaign chronicles
-
-Training history, ablations (incl. a shelved adversarial-MI variant), and
-the full-benchmark master table:
-https://github.com/axiotic-ai/ogma-v2/blob/main/docs/CHRONICLES.md
-
 ## Sibling
 
 `axiotic/ogma-libre-small` — the 8.96M-parameter sibling (same recipe, small trunk): 0.5843 @1024d.