feat: improve Python SDK parity for MCP errors, thinking signatures, hook inputs, and transport exit handling

feat: fix hook processor determinism, iterator robustness, and Python SDK parity

feat: add new hook events, plan permission mode, transport user option, and MCP config support

feat: always-streaming transport, thinking config, and SDK API improvements

fix: skip unknown content block types and update CLI to 2.1.4

chore: update to v0.1.19 with bundled CLI 2.1.1

feat: add UserMessage UUID field, error parsing, and update to v0.1.18

feat: add tools option, SDK betas, and file checkpointing support (v0.1.14)

feat: add sandbox configuration support and update CLI to v2.0.57 (v0.1.10)

refactor: reorganize codebase structure to pkg/internal layout

feat: add structured outputs, CLI bundling, and enhanced features (v0.1.9)

feat: add fallback model support to SDK options

fix: correct system prompt defaults and enhance CLI discovery

feat: add budget control and enable thinking tokens (v0.1.6)

feat: add SDK MCP server support and enhance plugin system (v0.1.5)