- Added mcpServerName and mcpToolName optional properties to tool definitions for MCP server discovery and tool name tracking.
- Changed aborted tool call handling to preserve existing tool results instead of replacing with synthetic 'aborted' results at turn boundaries.
- Extracted flushPendingToolCalls() and flushPendingAbortedToolCalls() helpers to consolidate orphaned tool call handling logic.
- Updated tool result handling to use message timestamps instead of Date.now() for synthetic results consistency.
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