normalize tokenized pool shard layout and organization linkage

README.md

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+---
+license: other
+task_categories:
+- text-generation
+language:
+- en
+pretty_name: Locus EXP Commit Code (Dolma 2 tokenized)
+---
+
+# Locus EXP Commit Code - Dolma 2 tokenized
+
+Pretokenized experiment pool for reproducible proxy-training runs.
+
+- `MANIFEST.json` is the authoritative schema, provenance, checksums, and train/holdout assignment.
+- `shards/shard-NNNNN/tokens.bin` stores little-endian int32 token IDs.
+- `offsets.bin` stores little-endian int64 document boundaries.
+- `index.parquet` stores document IDs, offsets, and compact filter fields.
+- `metadata.parquet` stores complete source metadata and is downloaded only for explicit cold-metadata filters.
+
+Each document already ends in exactly one EOD token. Training must not add another document-level EOD.
+
+Commit examples use `target_start_token` to mask the commit-message prompt and train only on the unified-diff target. Each commit document must fit one sequence.