Correct the raw socket spawn example to use the bootstrapped colibri-test-agent in the jail instead of the default remote-provider agent binary. Use a harmless FIRST_PROOF_KEY item for the throwaway collection.\n\nAlso convert packaging/freebsd/colibri-agent-loop.md to normal Markdown so the repository formatting gate passes.\n\nChecks: ./scripts/check-format.sh; git diff --check