Add Excel report generation for GitHub branch and PR data#751

Draft

Harmanpreet-Microsoft with Copilot wants to merge 8 commits into

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copilot/add-excel-sheet-functionality

Commits on Jan 2, 2026

Initial plan
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Add branch report generator with Excel export functionality

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Add MCP-based branch report service and sample generator

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Add quick start guide and example Excel report verification

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Address code review feedback: improve imports and add TODO comments

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Fix platform-independent paths and add file cleanup mechanism

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Harmanpreet-Microsoft
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Remove unused import and move asyncio import to top level

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Add implementation summary document

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Harmanpreet-Microsoft
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