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feat: Add process controller to TestBridge (Phase 4)

Add IProcessController for managing child processes during testing,
enabling external game process spawning, stdin/stdout communication,
and signal handling for integration and end-to-end testing.

New abstractions:
- IProcessController interface with process management methods
- ProcessStartOptions for configurable process spawning
- ProcessInfo for process state snapshots
- ProcessExitResult for exit information with captured output

Implementation features:
- Start processes with environment variables and working directory
- Capture stdout/stderr with configurable buffer limits (FIFO trimming)
- Write to stdin for interactive processes
- Wait for specific output patterns or process exit
- Graceful termination (SIGTERM/Ctrl+C) and forced kill (SIGKILL)
- Manage multiple processes with cleanup on disposal

Tests: 27 new tests (26 pass, 1 skipped Windows-only)

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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