Add assets.csv to build branch and update README links (#881)

Also output assets.csv alongside assets.json so both formats are
available on the build branch. Update README with direct links to
both json and csv files.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ohld

README.md

@@ -2,7 +2,7 @@
 Public dataset of labelled TON blockchain addresses
 
 After each commit to the main branch artefacts are compiled and pushed:
-* To [the build branch](https://github.com/shuva10v/ton-labels/blob/build/assets.json) - may be useful for manual checking addresses
+* To [the build branch](https://github.com/shuva10v/ton-labels/blob/build/assets.json) ([json](https://github.com/shuva10v/ton-labels/blob/build/assets.json), [csv](https://github.com/shuva10v/ton-labels/blob/build/assets.csv)) - may be useful for manual checking addresses
 * To TON Public Data Lake: s3://ton-blockchain-public-datalake/v1/ton-labels/json/
 * To Dune: **dune.ton_foundation.dataset_labels** table
 

build_assets.py

@@ -95,3 +95,5 @@
         for row in output_df.to_dict(orient="records"):
             f.write(json.dumps(row))
             f.write("\n")
+
+    output_df.to_csv("output/json/assets.csv", index=False)