feat(prbs): Add 100G PRBS monitor; fix the job log path and USB mount

port_prbs_monitor.sh drives PRBS on both 100G uplinks: lpmode off, arm
the pattern, then poll `phy diag <phy> prbs get` in the background until
stopped, counting a poll as PASS only when the output says "PRBS OK!".
prbsstat Ber is captured beside every poll for the record but does not
decide the verdict. `stop` runs prbsstat STOp and prbs clear before
rendering the report, so the test does not leave PRBS armed.

`start a` / `start b` runs one uplink alone, which is how a genuine port
fault is separated from the DUT not coping with two PRBS streams at
once. A port that was not run reports SKIP rather than FAIL -- deciding
on poll count alone would have made a deliberate single-port run look
like half the hardware was broken.

The port status is deliberately not printed at `start`: with PRBS armed
the link reports DOWN, which reads as a failure to anyone glancing at
the console. It appears in the report instead, after prbs clear and
labelled as the recovered state.

The calls in Script A, B and C are committed but commented out -- PRBS
is still under bring-up.

Fix: the job directory was written as /host/hw-eval/current/jobs in some
places and /host/hw-eval/jobs in others, so what Script B wrote was not
what Script C collected. Unified on /host/hw-eval/jobs.

Fix: Script C copied to /mnt/usb assuming it was mounted. It now finds
the device with usb_target.sh and mounts it first, so the logs actually
leave the DUT.

Script C also reorders its results -- stress logs, then the MGMT ping
report, then 100G status -- and cats the bgctl ssd/usb logs.

Script A -> V1.0.9. Docs and docs/release-notes/v1.0.9.md updated.

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

CLAUDE.md

@@ -9,11 +9,12 @@ DUT 端的取數能力由一組 **bash 工具庫** 提供（CB FPGA `pcimem` →
 
 完整架構見 [ARCHITECTURE.md](ARCHITECTURE.md)。
 
-**目前狀態（2026-08-25）**：Script A 為 **V1.0.7**（A 集中記錄 A/B/C 三支的變更）。涵蓋
+**目前狀態（2026-08-26）**：Script A 為 **V1.0.9**（A 集中記錄 A/B/C 三支的變更）。涵蓋
 PCIe AER / DDR EDAC / PMON+TPM / 電壓 margin（9 顆 LTC2980）/ SWB loopback 線速流量 /
 10G+1G 管理網路 ping / BMC DDR 與 USB / NVMe 健康，壓力層走平台的 `bgctl`。
 switch unit 數量由 `config.ttl` 的 `SWB_UNIT0` / `SWB_UNIT1` 宣告，風扇轉速由 `FAN_SPEED` 指定。
-測試 job log 收在 DUT 的 `/host/hw-eval/current/jobs/`，Script C 結束時帶時戳複製到 `/mnt/usb/`。
+測試 job log 收在 DUT 的 `/host/hw-eval/jobs/`，Script C 結束時掛好 USB 再帶時戳複製到 `/mnt/usb/`。
+100G PRBS（`port_prbs_monitor.sh`）已隨包交付，但 **A/B/C 的呼叫仍註解掉**，還在 bring-up。
 最後一次發布是 **V1.0.5**；SWB 的 I2C 通道與位址已於 2026-08-19 上機驗證。
 交付用 `./publish/publish.sh` 打包。
 
@@ -88,6 +89,18 @@ chmod +x ~/Blanton_Script/*.sh               # 佈署後必做一次
 #   bmc_monitor.sh   start/stop         # free -m + BMC I2C 寫入/讀回圖樣測試，log/bmc_poll.log
 #   ⚠️ bmc_monitor_ddr.sh 已停用（DDR 壓力改走 bgctl + bmc-manager），檔案仍在
 
+# ── 100G PRBS（目前 TTL 未啟用，手動測用）────────────
+bash ~/Blanton_Script/port_prbs_monitor.sh start        # 兩個 port 同時
+bash ~/Blanton_Script/port_prbs_monitor.sh start a      # 只跑 Ethernet513
+bash ~/Blanton_Script/port_prbs_monitor.sh start b      # 只跑 Ethernet514
+bash ~/Blanton_Script/port_prbs_monitor.sh report       # PASS/FAIL 統計（沒跑的顯示 SKIP）
+bash ~/Blanton_Script/port_prbs_monitor.sh stop         # 收尾會跑 prbsstat STOp + prbs clear
+#   ⚠️ PRBS 打起來時 link 會顯示 down，這是正常的 —— 所以 start 刻意不印 port status
+
+# ── USB 目標偵測 ────────────────────────────────────
+bash ~/Blanton_Script/usb_target.sh -o dev              # /dev/sdX1
+bash ~/Blanton_Script/usb_target.sh -o mnt              # 掛好並回傳掛載點
+
 # ── 背景壓力（平台工具）──────────────────────────────
 bgctl run /usr/sbin/memtester 1G 100
 bgctl list
@@ -187,6 +200,8 @@ Tera Term 連 COM port (115200-8-N-1)
 - ⚠️ **兩張管理網卡同網段會 ARP flux**：`mgmt_ping_monitor.sh` 讓 eth0/eth1 同時 up，同一個 /24 下
   對端 ARP 可能由任一張卡回應，回包落在沒送封包的那張。`ARP_STRICT=1` 擋掉；判讀時看 `RESULT` 行的
   `nic_tx`/`nic_rx`（該卡自己的 packet delta）—— **ping 成功但 `nic_tx` 接近 0 = 封包從另一張卡出去的**
+- ⚠️ **PRBS 跑起來時 `show interfaces status` 會顯示 DOWN**，那是 link 離開正常運作模式，不是故障。
+  `port_prbs_monitor.sh` 的 `start` 因此刻意不印 port status（避免測試員誤判），只在 `prbs clear` 之後的報表裡印
 - ⚠️ **`ip -s link` 的欄位順序是 `bytes packets errors ...`**，要 packet 數取的是**第 2 欄**不是第 1 欄
 - ⚠️ **`mgmt_ping_monitor.sh` / `bmc_monitor*.sh` 需要 exec bit**，且**不是改用 `bash x.sh start` 就能繞過** ——
   `do_start` 內部是 `setsid "$SCRIPT_PATH" __daemon`，直接執行該路徑。git 記錄是 `100644`，