BARE_OS_SHELL_STREAMING=1, BARE_OS_SHELL_STREAMING_MULT=2,
BARE_OS_PIPELINE_MAX_BYTES (512 MiB), and BARE_OS_PIPELINE_MAX_LINES
(2M) so the high-throughput ~512 MiB burst profile does not require
pre-launch exports.
Align getconf Tier-1 statics with those bases; note legacy rc.profile
exports; refresh handbook, environment appendix, cookbook, and
bare-os-booter CHANGELOG.