doc: Update PLANNING.md and report compilation command when benchmarking

PLANNING.md

@@ -99,6 +99,8 @@ Other tracks are stretch goals, contributions towards them are accepted.
       and used in zkVMs without any risk of C stdlib or syscalls being used
       and without depending on the Nim compiler at build time.
 - introduce batchAffine_vartime
+- Optimized square_repeated in assembly for Montgomery and Crandall/Pseudo-Mersenne primes
+- Optimized elliptic curve directly calling assembly without ADX checks and limited input/output movement in registers or using function multi-versioning.
 
 ### User Experience track
 

constantine.nimble

@@ -786,6 +786,9 @@ proc runBench(benchName: string) =
   if not dirExists "build":
     mkDir "build"
   let command = setupBench(benchName, run = true)
+  echo "\n=============================================================================================="
+  echo "Running '", command, "'"
+  echo "=============================================================================================="
   exec command
 
 proc buildBenchBatch(commands: var string, benchName: string) =