fix(io): Framed won't stop reading if underlying IO returns Ok(0)

[George-Miao]

No description provided.

[Copilot]

Pull Request Overview

This PR refactors the Framed module by restructuring internal state management, moving tests to a separate file, and improving documentation. The changes enhance encapsulation by making internal state transition methods private and introducing proper constructor methods.

• Wrapped read state in a new State structure with an eof field to properly track end-of-file
• Introduced constructor methods (new() and empty()) for both read and write states, improving API consistency
• Moved test code from inline module to a dedicated test file in compio-io/tests/framed.rs

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
compio-io/tests/framed.rs	New dedicated test file containing the framed functionality test previously in serde_json.rs
compio-io/src/framed/write.rs	Refactored state management with new constructors, made internal methods private, and reorganized code layout
compio-io/src/framed/read.rs	Introduced State wrapper struct with eof tracking and migrated from direct enum to inner/outer state pattern
compio-io/src/framed/mod.rs	Updated to use new state constructors and improved documentation with specific examples
compio-io/src/framed/codec/serde_json.rs	Removed inline test module (moved to dedicated test file)
compio-io/Cargo.toml	Added test configuration for the new framed test file with required features

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[Berrysoft]

Copilot is right.