Bump @linearb/gitstream-core to 2.1.246

[linearbci]

✨ PR Description

Purpose: Implement graceful error handling for deleted branch scenarios during workflow execution to prevent crashes and improve system reliability.

Main changes:

• Added branch deletion detection logic that identifies Git errors indicating missing or deleted branches
• Implemented graceful exit mechanism that logs warnings and exits cleanly instead of crashing when branches are deleted
• Created comprehensive error handling for branch deletion in both context retrieval and Git command execution paths

CHANGELOG

🔧 Improvements

• Workflows now exit gracefully when branches are deleted during execution instead of crashing

Generated by LinearB AI and added by gitStream.
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[orca-security-us]

Orca Security Scan Summary

Status	Check	Issues by priority
Passed	Infrastructure as Code	0   0   0   0	View in Orca
Passed	OSS Licenses	0   0   0   0	View in Orca
Passed	SAST	0   0   0   0	View in Orca
Passed	Secrets	0   0   0   0	View in Orca
Passed	Vulnerabilities	0   0   0   0	View in Orca

[yeelali14]

LGTM