supervisor: after git checkout + uv sync, os.execv replaces the running
process so new code takes effect immediately without a manual systemd
restart. systemd sees the same PID, so the unit stays "active".
ci: changed tag format from v{run_number} to v{YYYYMMDDHHMM}, matching
the supervisor's deploy tag convention. Sequential v<N> tags conflicted
with manual date-based tags causing an infinite redeploy loop.
No more manual tagging needed — CI tags automatically after green tests.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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