fix: resolve ambiguous argument error in git diff --stat command

[dvvaliya369]

Problem

Fixed GitHub Issue #3311 where v7 introduced an unexpected fatal: ambiguous argument error when executing git diff --stat develop..develop~8391. The error occurred during branch comparison operations in workflows using branch promotion setups.

Root Cause

The issue was caused by attempting to reference develop~8391 when the develop branch didn't have sufficient commit history depth (8391 commits) in the local repository, making the revision reference ambiguous or non-existent.

Solution

• Added validation to ensure commit count doesn't exceed available history depth
• Implemented proper error handling for git revision references
• Added fallback logic when commit history is insufficient
• Enhanced git diff command execution with proper revision validation

Impact

• Resolves fatal errors in v7 for users with DTAP (develop->staging->main) branch promotion workflows
• Maintains backward compatibility with existing configurations
• Improves reliability of automated pull request creation processes

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Agent: blackbox
Model: blackboxai/blackbox-pro