Fix integration test failures by increasing channel buffer sizes

- Increased server lines channel buffer from 1000 to 10000 to handle large test files
- Fixed TestDCatColors which was failing due to channel overflow with 2754 lines
- Enhanced test helpers with better timeout handling and output collection
- Improved line ending preservation in test output processing
- Added proper server shutdown delays to prevent test flakiness

The main issue was that test files with many lines (like dcatcolors.txt) were
causing "server lines channel full" errors when the channel buffer was too small.
Increasing the buffer size resolves this without introducing blocking behavior.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

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