1. Self-heal script: Add BINARY_PATH variable so CLI migration actually runs
- Previously logged "Binary not available" and skipped migration
2. migrate-sensor-proxy-control-plane.sh: Use atomic write (temp + rename)
- Prevents partial writes if script is interrupted
- Reduces race window with running service
These were the remaining gaps identified by Codex review.
NOTE: migrate-sensor-proxy-control-plane.sh still uses Python manipulation
instead of the Phase 2 CLI, but as a one-time migration script for upgrades
from v4.31, the atomic write provides sufficient protection. Future versions
can deprecate this script entirely.
