Todo 52.3 Benchmark Case and Mode Single Source Plan

Status: in_progress

Goal

Prevent benchmark configuration and the executable case catalog from drifting as new cases or modes are added.

Scope

Replace separate Literal declarations with StrEnum definitions for case IDs and invocation modes.
Derive exported ordered choice tuples from the enums.
Type catalog keys and config lists with those enums while preserving JSON string serialization and existing runtime request values.
Assert every case enum has exactly one catalog entry.

Files

Modify: src/agent_lab/application/benchmark.py
Modify: tests/test_benchmark_config.py
Modify: tests/test_tool_invocation_comparison.py

Verification

uv run pytest tests/test_benchmark_config.py tests/test_tool_invocation_comparison.py -q
uv run pytest
git diff --check