chore: retry cli tests on macos

[uinstinct]

Description

Hard retry twice for failing cli tests on macos.

closes CON-4927

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• [] I've read the contributing guide
• [] The relevant docs, if any, have been updated or created
• [] The relevant tests, if any, have been updated or created

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Summary by cubic

Retry CLI tests twice on macOS in CI to reduce flakiness. Enables Vitest’s retry in vitest.config.ts and vitest.e2e.config.ts only when CI is set and platform is darwin; addresses Linear CON-4927.

^{Written for commit 43dfbf5. Summary will update automatically on new commits.}

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✅ Addresses code review comments

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Reviewed the PR changes. No documentation updates needed - this is an internal CI configuration change to improve test reliability on macOS and doesn't affect user-facing features, CLI usage, or developer setup instructions.

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