Every variable the code reads or sets is now ZT_* with the same suffix,
with no aliases for the old names. User-facing text, default CSR fields
and error messages follow, as do the identifiers on the lines that
changed.
Three names keep their spelling because another program owns them: the
C tunneler reads ZITI_LOG and ZITI_TIME_FORMAT, and the Go SDK reads
ZITI_TRACE_ENABLED.
Co-authored-by: Hanzo Dev <[email protected]>