Improve OpenEvolve launcher setup, run performance eval for speedup, and standardize task result output

[sharareh-y]

Improve OpenEvolve launcher setup, run performance eval for speedup, and standardize task result output

What this PR changes

This PR updates the openevolve agent integration to make setup and evaluation behavior consistent and to emit richer task results.

1. Adds ensure_openevolve_setup() in agents/openevolve/launch_agent.py

   • Detects whether local geak-openevolve package + GEAK-eval-OE exist.
   • If missing, automatically runs agents/openevolve/agent_setup.sh.
   • Switches OpenEvolve imports to dynamic import after setup (importlib) to avoid import-time failures.

2. Fixes OpenEvolve setup script in agents/openevolve/agent_setup.sh

   • Uses HTTPS clone URLs.
   • Checks out required branches.
   • Installs both repos in editable mode to make modules importable in launcher execution.

3. Executes performance_command during evaluator runs

   • Previously performance command existed in task config but was not used by the OpenEvolve evaluator path.
   • Evaluator now runs performance commands after compile/correctness and captures outputs.
   • Parses perf timing from perf/*.json (ms fields) or falls back to stdout/stderr time parsing.

4. Adds baseline/optimized timing + speedup computation

   • Records:
     • base_execution_time
     • best_optimized_execution_time
     • speedup
   • Uses baseline vs current best timing and updates combined score accordingly.

5. Updates task_result.yaml writing logic

   • Writes standard fields expected by downstream flow, including:
     • best_optimized_source_file_path
     • best_optimized_kernel_functions
     • pass_compilation, compilation_error_message
     • pass_correctness, correctness_error_message
     • timing fields + speedup_ratio
   • Improves failure-path result writing with explicit error messages.

6. Tunes OpenEvolve config defaults (agent_config_amd_claude.yaml)

   • Adjusts iteration/population/timeouts and adds max_code_length.
   • Uses agent_config_amd_claude.yaml as launcher config source.

[sharareh-y]

WIP: need to add some fix commits