musig: add input JSON files for generating test vectors #1786

1. 
   theStack commented at 1:37 am on December 12, 2025: contributor

   While looking up past review history of the previous silentpayments PR (take 3), I’ve found that adding the input JSON files for generating the musig test vectors was suggested once there: #1698 (comment)

   Can be tested by first comparing that the .json files match the ones from the bips repository’s bip-0327/vectors folder and then running e.g.

   0$ rm src/modules/musig/vectors.h
   1$ make src/modules/musig/vectors.h
   2$ git diff
   3<should not show any diff>
   

2. musig: add input JSON files for test vectors 12bba63869
3. real-or-random added the label assurance on Dec 12, 2025
4. real-or-random added the label tweak/refactor on Dec 12, 2025
5. 
   real-or-random commented at 8:07 am on December 12, 2025: contributor

   Concept ACK
6. 
   kevkevinpal commented at 3:17 pm on December 13, 2025: contributor

   Concept ACK

   ---

   I was also able to run these commands and get the same results

   0$ rm src/modules/musig/vectors.h
   1$ make src/modules/musig/vectors.h
   2$ git diff
   3<should not show any diff>
   

Contributors
theStack real-or-random kevkevinpal

Labels
assurance tweak/refactor