Gate on Node 26.12.1, 31 files: 422 pass, 1 fail. The failure is the row 66 unslop timing flake in packages/harness/tests/claude-session.test.mjs, which fails about 1 run in 3 on the base too; the file rerun passed 14/0. Append-only BUILD-LOG.md and docs/SESSIONS.md conflicts keep both sides.