story-kit: queue 123_story_test_coverage_llm_providers_anthropic_rs for merge

.story_kit/work/3_qa/123_story_test_coverage_llm_providers_anthropic_rs.md

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----
-name: "Add test coverage for llm/providers/anthropic.rs (0% -> 50%+)"
----
-
-# Story 123: Add test coverage for llm/providers/anthropic.rs
-
-Currently at 0% line coverage (204 lines). The Anthropic provider handles API communication for Claude models.
-
-## What to test
-
-- Request construction (headers, body format, model selection)
-- Response parsing (streaming chunks, tool use responses, error responses)
-- API key validation
-- Rate limit / error handling
-- Message format conversion (internal Message -> Anthropic API format)
-
-## Notes
-
-- Mock HTTP responses rather than calling the real Anthropic API
-- Use `mockito` or similar for HTTP mocking, or test the pure functions directly
-- Focus on serialization/deserialization and error paths
-
-## Acceptance Criteria
-
-- [ ] Line coverage for `llm/providers/anthropic.rs` reaches 50%+
-- [ ] Tests pass with `cargo test`
-- [ ] `cargo clippy` clean