feat: add ROO_ACTIVE env variable to terminal env settings

[ajjuaire]

Related GitHub Issue

Closes: #11864

Roo Code Task Context (Optional)

N/A

Description

Adds ROO_ACTIVE: "true" to the terminal environment variables in Terminal.getEnv(). This allows scripts and tools running inside Roo Code terminals to detect they are in a Roo Code session by checking the ROO_ACTIVE env variable, enabling safety guardrails against destructive operations initiated by Roo.

Test Procedure

1. Open a Roo Code terminal
2. Run echo $ROO_ACTIVE — should output true
3. Verify other env variables (PAGER, VTE_VERSION) are unaffected

Pre-Submission Checklist

• Issue Linked: This PR is linked to an approved GitHub Issue (see "Related GitHub Issue" above).
• Scope: My changes are focused on the linked issue (one major feature/fix per PR).
• Self-Review: I have performed a thorough self-review of my code.
• Testing: New and/or updated tests have been added to cover my changes (if applicable).
• Documentation Impact: I have considered if my changes require documentation updates (see "Documentation Updates" section below).
• Contribution Guidelines: I have read and agree to the Contributor Guidelines.

Screenshots / Videos

Documentation Updates

• No documentation updates are required.

Additional Notes

Minimal one-line change to the env object in getEnv().

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