Bump @linearb/gitstream-core to 2.1.291

[linearbci]

✨ PR Description

Purpose: Implement GitLab commit status foundation with sanitization, existence checking, and outcome reporting capabilities for pull requests.

Main changes:

• Added function to check for existing gitStream commit statuses on commits
• Implemented commit status sanitization (decode newlines, enforce 255-character limit) and refactored from fetch to axios API calls
• Created utility that updates commit statuses or adds labels based on outcome and existing status presence

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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