streamline-error-handling-hotpath-improvement

[isdaniel]

• improve LSN loading with Acquire ordering and enhance WAL message header parsing
• streamline error handling in BufferReader and LogicalReplicationParser

[codecov]

Codecov Report

❌ Patch coverage is 97.87234% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.74%. Comparing base (c8044ac) to head (f56bd2e).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/lsn.rs	96.29%	2 Missing ⚠️
src/stream.rs	97.77%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #62      +/-   ##
==========================================
+ Coverage   93.68%   93.74%   +0.06%     
==========================================
  Files          10       10              
  Lines       14260    14364     +104     
==========================================
+ Hits        13359    13466     +107     
+ Misses        901      898       -3     

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[gemini-code-assist]

Code Review

This pull request introduces performance optimizations across the replication module. It refactors error paths in src/buffer.rs and src/protocol.rs into #[cold] functions, removes the skip_message_type method, and optimizes atomic LSN updates in src/lsn.rs to reduce redundant loads. Additionally, src/stream.rs now amortizes connection health checks and uses direct slice access for WAL message decoding. The PR also includes extensive unit and stress tests to ensure the correctness of these optimizations. I have no feedback to provide.