Add Go (Golang) Polyglot Benchmark Suite (feat-go-ratelimiter)

[Kaap10]

Description

AgentBench currently supports Python (pytest) and Node.js (node --test). Adding Go (Golang) benchmark tasks evaluated with go test will expand polyglot evaluation capabilities for AI agents across systems languages.

Proposed Solution

1. Create benchmarks/repos/go-rate-limiter/ containing a token-bucket rate limiter implementation (limiter.go) and test suite (limiter_test.go).
2. Create benchmarks/tasks/13-feat-go-ratelimiter.yaml with evaluation command go test -v ..
3. Enhance backend/app/evaluation/test_parser.py with parse_go_test() to extract PASS and FAIL counts from go test outputs.

Relevant Files

• backend/app/evaluation/test_parser.py
• benchmarks/tasks/13-feat-go-ratelimiter.yaml
• benchmarks/repos/go-rate-limiter/

Acceptance Criteria

• python agentbench.py run --benchmark feat-go-ratelimiter --provider mock --model mock-coder completes and computes score correctly.
• Test output parser correctly captures Go assertion outputs.