Add Claude Code adapter live layer with error mapping tests

- introduce `ClaudeCodeAdapter` service and live layer wiring
- map runtime/session/request failures into provider adapter error types
- add coverage for validation, session-not-found mapping, lifecycle forwarding, and event passthrough
f2e087cba4Julius Marminge committed on 2/28/2026, 5:35:28 AMparent310c763
3 files changedLine totals unavailable