fix: harden note-program model against corrupt tempo/division/denomination records

Reject subnormal BPM that overflows to NaN, normalize Division equality, pin a single out-of-range-denomination interpretation across all readers, flag collapsed capture windows, add offset off-view editors and structural static_asserts, collapse duplicated CLAUDE.md facts.

src/core/instrument/note/tempo.h

@@ -7,6 +7,7 @@
 #pragma once
 
 #include <optional>
+#include <type_traits>
 
 namespace reasampler::instrument::note {
 
@@ -34,4 +35,7 @@ private:
     double bpm_;
 };
 
+static_assert(!std::is_default_constructible_v<Tempo>,
+              "Tempo must not be constructible without a validated BPM");
+
 }  // namespace reasampler::instrument::note