fixes 0.7.0

[qiweiii]

No description provided.

[github-actions]

The review found three critical issues. The first is an incorrect order of operations in gas consumption logic, which could lead to an invalid state. The second is a flawed balance check in the transfer function, potentially allowing accounts to fall below their minimum required balance. The third is an incorrect test expectation for encoding an array of nils, which does not match the encoder's behavior.

[codecov]

Codecov Report

❌ Patch coverage is 90.21739% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.46%. Comparing base (03a06fc) to head (9460928).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...ces/Blockchain/RuntimeProtocols/Accumulation.swift	84.61%	4 Missing ⚠️
PolkaVM/Sources/PolkaVM/Engine.swift	60.00%	2 Missing ⚠️
PolkaVM/Sources/PolkaVM/ProgramCode.swift	94.28%	2 Missing ⚠️
...ain/Sources/Blockchain/State/ServiceAccounts.swift	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #362      +/-   ##
==========================================
+ Coverage   80.67%   81.46%   +0.79%     
==========================================
  Files         378      378              
  Lines       33313    33315       +2     
==========================================
+ Hits        26876    27141     +265     
+ Misses       6437     6174     -263     

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