diff --git a/4-Infrastructure/AGENTS.md b/4-Infrastructure/AGENTS.md
index ccd4fb26..8485e608 100644
--- a/4-Infrastructure/AGENTS.md
+++ b/4-Infrastructure/AGENTS.md
@@ -432,6 +432,20 @@ These tables extend `ene_substrate_schema.sql` to support the Braid Eigensolid C
 
 Verification is driven by `4-Infrastructure/shim/verify_ene_schema.py`, which validates the schema layout and emits `shared-data/data/stack_solidification/ene_schema_validation_receipt.json`.
 
+## Build-log automation
+
+Every commit to Research Stack now triggers a background ingestion of the
+blessed Compiler surface:
+
+- Hook: `.git/hooks/post-commit` (local, not tracked)
+- Command: `python3 "4-Infrastructure/shim/lake_build_ingest.py" Compiler --actor opencode`
+- Runs in background so `git commit` is not blocked
+- Log: `~/.cache/lake-build-ingest.log`
+- Destination: `ene.sessions`, `ene.packages`, `ene.receipts`, `ene.ingest_events` on neon-64gb (`arxiv-pg` container)
+
+To reinstall the hook on a fresh clone, append the background invocation from
+`.git/hooks/post-commit` to the Git LFS post-commit hook.
+
 ## Cross-References
 
 See root `AGENTS.md` for: