feat(reboot): Add a standalone reboot-cycle macro

5_Blanton_Script_Reboot_Cycle.ttl loops: login -> sudo -i -> date -s -> fan
speed -> wait_init -> Check Pt1..Pt13 -> show uptime -> reboot -> wait for the
next boot. The cycle number is printed in the banner of every round.

Like Script 4 it is standalone: it does not chain to A -> B -> C and does not
use hw-test-session. Every cycle is a fresh boot, so there is nothing to carry
over and nothing to tear down.

The cdc_ncm probe was copied out of Script B without its :skip_ping label, so
'goto skip_ping' had no target. Tera Term does not check labels at load time -
it raises the error only when it actually jumps, i.e. only when the NCM
interface is missing, which is exactly the run where something is already
wrong. The label is now there, and timeout is restored BEFORE the branch so
one line covers both paths: the ping block waits on a 'sleep 10', already two
thirds of the 15 s cap on a loaded DUT.

Dmesg_i2c and PCIE Error Counters both announced themselves as Check Pt12;
the second is now Pt13.

Not verified on hardware yet. Two things to confirm on the bench: that
wait "Booting in blind mode" really appears in this build's boot output (it
has no timeout guard, so a changed string waits forever), and that re-running
bmc-first-enroll every cycle is safe.

Also ignore tmp/ - scripts not yet run on a DUT stage there, so an unverified
script cannot reach the publish bundle where the tester cannot tell it apart
from the rest.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014RetWKFZFG1ZHcitQAyhwM

.gitignore

@@ -28,3 +28,6 @@ publish/*
 # 客戶板 schematic 原始檔（機密，勿入 repo）
 *.DSN
 *.dsn
+
+# 尚未上機驗證的腳本暫存區（不入 repo，測過再搬進 src/）
+tmp/