Enforce 64-instruction transaction limit across kit #1157
+726
−25
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Problem
SIMD‑0296 raises the transaction byte limit to 4096, but the instruction count cap stays at 64.
Kit currently enforces size, not instruction count, so transactions could exceed 64 instructions once the size limit increases.
We need to enforce the 64‑instruction limit when building/compiling messages and when planning transactions.
Summary of Changes
Closes #1102