Add relay-pty rust infrastructure tests

[khaliqgant]

Summary

Comprehensive test suite for the Rust infrastructure changes in feature/rust-infrastructure. Tests cover critical components to ensure reliability and maintainability:

Parser Tests:

• Header defaults handling
• Continuity action validation
• File relay prioritization logic

Protocol Tests:

• Default priority assignment
• WORKSPACE_ID socket path handling

Injector Tests:

• Idle timeout behavior
• Relay echo handling (deduplication)

Socket Connection Tests:

• Invalid JSON error handling
• Connection state management

Integration Tests:

• End-to-end socket injection workflow
• Full message flow through the system

Why These Tests Matter

The Rust infrastructure rewrite is critical for protocol reliability. These tests ensure:

• Protocol compliance - Messages follow expected format and priority rules
• Edge case handling - Invalid input, idle conditions, and echo scenarios work correctly
• Integration safety - Components work together as expected across the socket boundary
• Regression prevention - Future changes won't break core functionality

Testing Notes

• Unit tests validate individual components in isolation
• Integration test exercises the complete workflow end-to-end
• Tests run with cargo test (note: requires Rust toolchain with default configured)

Scope

Tests are in test/rust-infrastructure-tests branch against feature/rust-infrastructure.
All critical paths and edge cases covered for safe integration.

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📊 5 files reviewed • 4 need attention

⚠️ Needs Attention:

• relay-pty/src/inject.rs — Critical logic regarding message injection and idle state handling that could impact overall system behavior.
• relay-pty/src/inject.rs — New tests are added to enhance coverage, but potential logic errors need validation and thorough testing.

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