fix: pass headers for HTTP/SSE MCP servers

feat: add on_tool_input_transform callback for parameter injection

fix: add proper lifecycle management to prevent unclosed client sessions

fix: input_tokens 計算含 cache tokens + on_result 傳遞完整 usage

chore: bump version to 0.4.2

fix: StreamReader has no close() method (#2)

Merge pull request #1 from yazelin/feat/client-model-and-usage

feat: add set_model(), token usage tracking, and on_result event to ClaudeClient

chore: bump version to 0.4.1

fix: close subprocess pipes in disconnect to prevent event loop errors

docs: rewrite README to reflect current codebase state

chore: bump version to 0.4.0

feat: add AvailableCommandsUpdate and SessionModelState support

chore: bump version to 0.3.9

feat: add pytest test framework and fix MCP loading