Add breakOnSystemExit setting to launch/attach configuration schema - #1078

PR classified as team-member.

⚠️ Head commit is NOT signed by a trusted team member, so the full 2-approval requirement applies. (Clean GitHub merge efd9277 of base into PR branch, but PR-branch parent 90a13ca is not signed by a trusted team member: Head commit signature not verified (reason: unsigned).)

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✅ Collaborator approvals: 2/2 (StellaHuang95, bschnurr).

✅ No newly added runnable binary files.