Bump @linearb/gitstream-core to 2.1.259

[linearbci]

✨ PR Description

Purpose: Fix non-fatal error handling for git blame and activity context extraction to prevent pipeline failures when git metadata is unavailable.

Main changes:

• Changed error handling from fatal to non-fatal logging with DataDog and error manager
• Added defensive null checks for blame and activity data in filter functions to prevent runtime errors
• Updated functions to return empty default objects instead of throwing when git context extraction fails

CHANGELOG

🐛 Bug Fixes

• Git blame and activity extraction no longer crash PR processing on intermittent filesystem errors

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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

[MishaKav]

LG