Commits the row 227 evidence under agents/steelbeak/work/queue-227/: the remaining gate/ files, runs/ (first, corrected1, priorityprobe), target-packet, target-packet-r2, target-packet-r3, target-packet-r4, static/, and the two top-level manifests. Also commits BUILD.md and the append-only BUILD-LOG.md and docs/SESSIONS.md entries. The R4 packet hashes are PACKET.sha256 4eb60915b2144137df9b5a42afd0c5b266718d71de051fb8be53a27430a2cad4 and CURRENT-SOURCE.sha256 0cfd47c2073bc18a3ba7bff1ce6fdf39fe33a64b7fca209be71517b9feb89020, both checked against the files. The overlay bytes are committed in 4ac6f13bc. This commit adds receipts and packets only and records no scripts/test-case2.sh run on the R4 overlay.