Answer A-90: every watched branch is taken in by the trunk's take-in

Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h
2026-11-11 23:25:22 +01:00
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@@ -347,3 +347,7 @@ names the principle that settles it, and is cited as "design 47 G A-n".
 - **A-89** (§37, §700, A-74; principle 7, one way for every asker) The runner reads its approval ask's warrant from the
  router's record of its ask, through the seat `operator-channel` as A-74 has it, never from the decided event's body;
  the decided event only wakes it.
+- **A-90** (§13, §14, §291, ADR 0666 §6, A-85; principle 7) A non-first branch's revision is made by the same take-in as
+  the trunk's, taken per watched branch: `sourceFollow` takes `source.<branch>` for every watched branch, and the
+  source path (`ApplySource`, the catch-up, the heads' take-in) runs with the branch as its argument, writing that
+  branch's revision; the trunk is each registration's first branch, not a constant.