Refactor vm.Execute

[RafaelGranza]

Summary

Replaces the 7 positional boolean flags on vm.VM.Execute with typed, semantic wrappers, so callers describe what they're doing (Simulate / Trace / BuildBlock) instead of memorizing flag positions.
Also breaks down the method into smaller helpers.

Why

vm.Execute takes 7 positional bool parameters and is invoked from 8 production sites and ~38 test setups. The shape has caused real documentation drift:

Every existing call site falls into one of three semantic buckets:

• Trace: replay an existing block (only returnInitialReads varies)
• Simulate: RPC simulate_transactions / estimate_fee (5 flags vary)
• BuildBlock: block production: builder + genesis (3 flags vary)

Notes for reviewers

• No Rust / FFI signature changes (it was introducing more code/complexity than needed).
• Execute still exists to bring more options if needed.
• Execute was broken down into small helpers
• Since I took a look at rust code, I removed unnecessary cloning and memory allocation from cair_vm_execute.

[codecov]

Codecov Report

❌ Patch coverage is 78.33333% with 26 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.84%. Comparing base (605c6fe) to head (9e64a35).

Files with missing lines	Patch %	Lines
node/throttled_vm.go	10.34%	23 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3602      +/-   ##
==========================================
- Coverage   75.94%   75.84%   -0.10%     
==========================================
  Files         381      381              
  Lines       34275    34377     +102     
==========================================
+ Hits        26030    26074      +44     
- Misses       6421     6479      +58     
  Partials     1824     1824              

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[rodrodros]

Looks good, some nitpicks