story-kit: accept 124_story_test_coverage_llm_providers_claude_code_rs

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+---
+name: "Add test coverage for llm/providers/claude_code.rs (54% -> 75%+)"
+---
+
+# Story 124: Add test coverage for llm/providers/claude_code.rs
+
+Currently at 54% line coverage (496 lines, 259 missed). The Claude Code provider spawns `claude` CLI processes and manages their I/O.
+
+## What to test
+
+- Command argument construction (model, max-turns, budget, system prompt, append flags)
+- Output parsing (streaming JSON events from claude CLI)
+- Session ID extraction
+- Process lifecycle management
+- Error handling (process crash, invalid output, timeout)
+- Permission request/response flow
+
+## Notes
+
+- Mock the process spawning rather than running real `claude` commands
+- Test the output parsing logic with sample JSON event streams
+- The argument construction logic is especially testable as pure functions
+
+## Acceptance Criteria
+
+- [ ] Line coverage for `llm/providers/claude_code.rs` reaches 75%+
+- [ ] Tests pass with `cargo test`
+- [ ] `cargo clippy` clean