Bump @linearb/gitstream-core to 2.1.288

[linearbci]

✨ PR Description

Purpose: Add support for custom environment variables in playground mode to safely expose user-provided secrets without leaking backend process.env.

Main changes:

• Added customEnv parameter to RuntimeOptions and setCustomEnv/getCustomEnv/applyPlaygroundEnv functions in playground utilities
• Integrated applyPlaygroundEnv call in executeOneRuleFile and executeParser to inject user env into rule execution context
• Added test coverage verifying playground exposes only user-provided env, never backend secrets

CHANGELOG

✨ New Features

• Playground now supports custom environment variables

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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