fix(ci): exit early when all fallback models match primary

[seonghobae]

The script was previously failing to exit after printing an ERROR when all fallback models matched the primary model (Bug 13). Adding return 1 fixes this logic so that the gate correctly halts execution and fails.

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PR created automatically by Jules for task 14209078825298172874 started by @seonghobae

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Reviewing files that changed from the base of the PR and between 29ea986 and 7036fc1.

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• scripts/ci/strix_quick_gate.sh

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[github-actions]

PR governance metadata gate is not ready for 7036fc1ebfe4dee612352b43df41027dfcb9b974:

• Branch is BEHIND the base branch; update the branch and re-run checks.
• Current-head CodeRabbit issue comment has blocking warning/failure evidence on 7036fc1.

[seonghobae]

Closing as superseded by #288. Master already includes the fallback-exhaustion return path in scripts/ci/strix_quick_gate.sh, and this branch is now behind the Vertex/org-secret Strix workflow.