Add integration tests in test/claude.go for Claude provider:
ParseConfig tests:
- claude standard config
- claude code mode config
- claude config without token fails
HttpRequestHeaders tests:
- claude standard mode uses x-api-key
- claude code mode uses bearer authorization
- claude code mode adds beta query param
- claude code mode with custom version
HttpRequestBody tests:
- claude standard mode does not inject defaults
- claude code mode injects default system prompt
- claude code mode injects bash tool
- claude code mode preserves existing system prompt
- claude code mode does not duplicate bash tool
- claude code mode adds bash tool alongside existing tools
All tests run in both go and wasm modes.
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