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This PR replaces `find -print0 | xargs -0 -I{} sh -c '...'` with
`find -print0 | while IFS= read -r -d '' f; do ... done` for the
subverso sub-manifest sync in release_steps.py. The original xargs
invocation had fragile nested shell quoting; the while-read loop is
both null-delimiter safe and more readable.
🤖 Prepared with Claude Code
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>