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-booter/lib/shell.js

@@ -319,14 +319,24 @@ export function getBareOsPipelineLimits(env) {
     'BARE_OS_PIPELINE_MAX_LINES',
     DEFAULT_PIPELINE_MAX_CAPTURE_LINES
   )
+  const effectiveBytes = Math.floor(baseBytes * mult)
+  const effectiveLines = Math.floor(baseLines * mult)
   return {
     maxStages: parse(
       'BARE_OS_PIPELINE_MAX_STAGES',
       DEFAULT_PIPELINE_MAX_STAGES
     ),
-    maxBytes: Math.min(Math.floor(baseBytes * mult), absMaxBytes),
-    maxLines: Math.min(Math.floor(baseLines * mult), absMaxLines),
-    streamingMultiplier: mult
+    maxBytes: Math.min(effectiveBytes, absMaxBytes),
+    maxLines: Math.min(effectiveLines, absMaxLines),
+    streamingMultiplier: mult,
+    /** True when `BARE_OS_SHELL_STREAMING` relaxes caps via multiplier. */
+    streamingEnabled: streamOn,
+    /** Parsed `BARE_OS_PIPELINE_MAX_*` before multiplier (for operator snapshots). */
+    baseMaxBytes: baseBytes,
+    baseMaxLines: baseLines,
+    /** Hard ceilings after multiplier (`BARE_OS_PIPELINE_ABS_MAX_*`; defaults 512 MiB / 2 M lines). */
+    absCapBytes: absMaxBytes,
+    absCapLines: absMaxLines
   }
 }