Implement IPC error handling and refactor command parsing in StreamFrame

[Oluwasuyi-Timilehin]

#closes #1404

PULL REQUEST DOCUMENTATION

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TITLE:

fix(ipc): Bubble up IPC parsing errors instead of unwrapping

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DESCRIPTION:

Overview

This PR updates simulator/src/ipc/mod.rs to remove unsafe unwrap() semantics during IPC command handling and serialize/deserialize operations. Instead of panicking, the IPC module now returns a custom IpcError enum when stdin read, JSON parsing, or response serialization fails.

Changes

Core Implementation

• Added IpcError to represent IPC-specific IO, parse, and serialization failures.
• Added parse_command_frame() to centralize JSON command parsing and return structured errors.
• Updated handle_stdin_command() to propagate errors through Result<(), IpcError> rather than silently swallowing or panicking on invalid input.
• Preserved SnapshotRegistry semantics while making error handling explicit.

Testing

• Added regression test test_parse_command_frame_invalid_json_returns_error for invalid JSON command parsing.
• Verified IPC module compilation and execution through crate-level tests.

Verification

• Ran cargo check in simulator successfully.
• Ran cargo test -q in simulator successfully.

Type of Change

• New feature
• Bug fix
• Breaking change
• Documentation update

Checklist

• Code follows project style guidelines
• Self-review completed
• Tests added/updated
• Documentation updated
• No new linting issues
• Changes verified locally

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RELATED ISSUE

#closes

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[dotandev]

the out file wasn't necessary, I have removed it.

[dotandev]

fix ci errors, please.

[Oluwasuyi-Timilehin]

@dotandev I already fixed CI

[dotandev]

alright, thank you.

[dotandev]

wait, did you just remove the file?

there's no file for me to review again?

[Oluwasuyi-Timilehin]

@dotandev No i just resolved the conflicts