feat: add RHIZA_SYNC_SCHEDULE variable to override default sync cron#955

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Copilot wants to merge 3 commits intomainfrom

copilot/enable-user-sync-overrides

Commits on Mar 30, 2026

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Copilot
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feat: enable users to override default rhiza sync schedule via RHIZA_SYNC_SCHEDULE

Copilot
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markrichardson
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fix: use portable sed -i.bak for macOS compatibility and improve test realism

Copilot
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markrichardson
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