fix(security): redact GatewayCredentials representations

[seonghobae]

Test-first security repair for #128

Protected main now includes #71, so the former provider-client writer dependency is satisfied. This bounded branch hardens only GatewayCredentials representation confidentiality without changing credential resolution or transport semantics.

Current RED head c29cdc40139cea6d9c43a9e69bfb75e528e270b6 adds a focused regression proving provider API-key sentinel material must not appear in repr() or str(), while preserving constructor access, equality behavior, class identity, and visible non-secret gateway URL. The production fix will follow on this same branch after the intended RED is observed.

No serialization, encryption, persistence, provider protocol, workflow, schema, or release authority claim is made. Direct attribute access and caller-controlled serialization remain separate authority surfaces.

Refs #128.

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📥 Commits

Reviewing files that changed from the base of the PR and between bf0f5c0 and e54631f.

📒 Files selected for processing (2)

• pg_llm_batch/batch_api_client.py
• tests/test_gateway_credentials_representation.py

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