fix(preimage): Improve error differentiation in preimage servers

[clabby]

Overview

Improves the differentiation of errors in the preimage server routes. This allows for us to throw on non-pipe related errors, rather than silently fail and assume that the exit is related to a broken pipe.

Also fixes an edge case where if the HintReaderServer receives bad UTF-8, it will block forever.

[clabby]

• chore: clean up host CLI #536
• fix(preimage): Improve error differentiation in preimage servers #535 👈
• main

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[codecov]

Codecov Report

Attention: Patch coverage is 98.88889% with 1 line in your changes missing coverage. Please review.

Project coverage is 77.1%. Comparing base (83becd6) to head (22a3c62).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/preimage/src/hint.rs	98.7%	1 Missing ⚠️

Additional details and impacted files

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