row 222: BUILD.md rebase onto 215's landing e54e05463 (sage-2099)

agents/megavolt/work/queue-222/BUILD.md

@@ -2,8 +2,14 @@
 
 Row 222, #1723, reviewer Dewey. Brief: C2-03a in the case 2 plan (sage-1853, sage-1854), with
 sage-2021 and sage-2022 adding to it. Built on Herb's row 215 candidate source e333af4dc (base
-f8276c5eb, packet 14a03d10f, Herb's BUILD.md blob f80f21919d95). It rebases onto 215's landing
-before review.
+f8276c5eb, packet 14a03d10f, Herb's BUILD.md blob f80f21919d95), then rebased with no conflicts
+onto 215's landing e54e05463 (sage-2099) as branch megavolt/row222-r2. The old branch
+megavolt/row222 is kept.
+
+Between e333af4dc and e54e05463, two of 222's files changed. broker.mjs gained row 249's
+hostLineLeft lines, which 222 doesn't touch. stack-copy.sh gained row 66's `tools/unslop-hook`
+in COPY_PATHS, two lines below 222's `packages/library/bin`. In the range-diff, commit 1 differs
+only in that context line, and commits 2 and 3 are identical.
 
 ## What it does