Todo 52.1 Benchmark URL Control Characters Plan

Status: done

Goal

Keep malformed benchmark targets inside the configuration error boundary instead of leaking an httpx.InvalidURL during live client construction.

Scope

Reject ASCII and Unicode characters whose category is control/format, including NUL, CR, LF, and tab.
Retain the existing HTTP(S), no-userinfo, no-query, and no-fragment requirements.
Add focused valid/invalid URL regression tests.

Files

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

Verification

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

Observe / Update

Control-category characters are rejected before transport construction while printable internationalized URLs remain covered.
Focused tests passed (67 passed) and the full suite passed at this checkpoint (472 passed).