fix: route Java/JavaScript/TypeScript to Optimizer instead of Python tracer

[mashraf-222]

Problem Fixed

Java, JavaScript, and TypeScript optimization was broken. When running codeflash optimize --file <file> on non-Python files, the CLI crashed with:

FileNotFoundError: [Errno 2] No such file or directory: '--file'
Error location: codeflash/tracing/tracing_new_process.py:855

Impact: Blocked all Java E2E optimization flows

Root Cause

tracer.py had no language check before invoking the Python tracer. All codeflash optimize commands were routed through tracing_new_process.py (Python-specific), regardless of the target file's language.

When Java files were passed with --file, the tracer tried to execute --file as a Python script, causing the error.

Solution

Added language detection at the start of tracer.py:main():

1. Detect file language using get_language_support(file_path)
2. If Java/JavaScript/TypeScript: Route directly to optimizer.run_with_args() instead of Python tracing
3. If Python or detection fails: Continue with normal Python tracing flow

Java and JS/TS use their own test runners (Maven/JUnit, Jest) and should never go through Python tracing.

Code Changes

File: codeflash/tracer.py

• Added language detection before argument parsing
• Route non-Python languages directly to Optimizer
• Parse and process args properly with process_pyproject_config()
• Set previous_checkpoint_functions = None for single-file optimization

Testing

Before fix:

$ codeflash optimize --file QuickSort.java --function sort
FileNotFoundError: [Errno 2] No such file or directory: '--file'
❌ Failed to trace. Exiting...

After fix:

$ codeflash optimize --file QuickSort.java --function sort
INFO     Detected java file, routing to Optimizer instead of Python tracer
INFO     Found 1 function to optimize
INFO     Discovered 400 existing unit tests
✓ Java optimization flow works

Impact

✅ Unblocks: All Java E2E optimization flows
✅ Unblocks: JavaScript/TypeScript optimization flows
✅ Fixes: Future Java testing and validation work

🤖 Generated with Claude Code