When the host leaves these unset, the booter now sets

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.

packages/bare-os-coreutils/man/pages/kernel-doctor.json

@@ -5,7 +5,7 @@
   "synopsis": [
     "kernel-doctor [OPTION]... [OPERAND]..."
   ],
-  "description": "Bare OS implementation of kernel-doctor. Full behavior is defined in packages/bare-os-coreutils/src/kernel-doctor.js.",
+  "description": "Prints a non-secret guest snapshot. With --json, includes /proc JSON (e.g. resources.pipeline: effective maxBytes/maxLines plus absCapBytes/absCapLines ceilings, baseMax*, streamingEnabled) and envHints for select BARE_OS_* keys (including pipeline tunables). See packages/bare-os-coreutils/src/kernel-doctor.js.",
   "options": [],
   "keywords": [
     "kernel-doctor",