chore: merged in upstream changes
- Added ExtensionRuntime shared state with async extension factory support
- Introduced pluggable tool operations (BashOperations, FileOperations, etc.) for remote execution
- Added new CLI flags: --no-tools, --no-extensions, --no-skills
- Added login dialog, countdown timer, and component barrel export
- Added blockImages and thinkingBudgets settings
- Refactored stdin handling with StdinBuffer for improved key parsing
- Updated DEVELOPMENT.md with new architecture documentation
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