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Records the decision to keep Stammbaum layout in-house, with the in-house fixes from commits 1-6 of #361 as the implementation, and a UX-signal-only stop trigger as the dagre re-evaluation criterion. Captures the deferred acceptance criteria (AC3, AC6, AC7) with explicit revisit triggers so future maintainers do not silently inherit unbounded scope. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>