fix(margin): Reference VNOM to what the rails run at, and split profiles per CONN

86 of the 144 margin channels moved up +0.8% .. +2.5% to the measured
median for this platform (3.3 -> 3.38, 0.9 -> 0.915, 0.8 -> 0.82, ...).

That is not a display change. VNOM is the denominator of margin_status'
deviation %, and it is also the basis margin_set derives high/low/OV/UV
from - so both the number you read and the voltage you apply move with
it. A rail steady at 0.756 V used to read +0.80% against a nominal 0.75
and now reads 0.00%. Margin logs from before and after cannot be
compared: the reference moved, the hardware did not.

comboA/comboB are replaced by combo_SWB_CONN13..16_{high,low}. The
per-channel percentages are positional, so they follow the rails of one
specific board - applying a CONN13 profile to a CONN16 margins the wrong
rails and nothing detects it. SWB0 and SWB1 share a profile per CONN
because their rails are identical.

Fixes two things the deletion broke:
  - margin_apply_profile_all.sh still named comboA for all nine boards,
    which would now stop at "Profile not found" nine times over. It names
    the matching per-CONN profile instead, with CB on the generic
    combo_high3, and a note that the low pass is _high -> _low.
  - docs/LTC2980_channel_map.csv is generated from settings/*.conf, so
    all 86 changed rails were stale in it. Regenerated.

The eight new profiles also still carried comboA's header comment
("alternating high/low"), which describes neither what they contain nor
what they are for.

Script A -> V1.1.3.

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

CLAUDE.md

@@ -9,7 +9,7 @@ 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（2026-08-28）**：Script A 為 **V1.1.2**（A 集中記錄 A/B/C 三支的變更）。涵蓋
+**目前狀態（2026-08-30）**：Script A 為 **V1.1.3**（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
@@ -23,7 +23,8 @@ TR518 負載（`blanton_tr518.sh`，**TTL 尚未接**）、SWB 軌功耗（`TH6_
 Script A 開頭會先收掉前一輪殘留（`hw-test-session finish` + `bgctl reset/stop --all`），
 再 `bgctl list` 確認沒有 job 留著佔資源。
 NFC tag 讀取由 `nfc_polling.sh` 背景輪詢（A 做基線、B 起、C 停並 report）。
-最後一次發布是 **V1.1.1**；SWB 的 I2C 通道與位址已於 2026-08-19 上機驗證。
+最後一次發布是 **V1.1.2**；SWB 的 I2C 通道與位址已於 2026-08-19 上機驗證。
+margin 的 `VNOM` 已於 2026-08-30 改為 Blanton 實測中位數（144 條軌中 86 條上調 0.8~2.5%）。
 交付用 `./publish/publish.sh` 打包。
 
 ## 技術棧
@@ -218,6 +219,12 @@ Tera Term 連 COM port (115200-8-N-1)
 - ⚠️ **ICB/PDB 一律走 VI2C（`blanton_icb_vi2c.sh`），不要走 VSPI**：VSPI ~18 ms/reg 會讓 I2C
   byte 相間隔拉到 ~50 ms，踩中 SMBus 25–35 ms timeout，裝置直接 NACK。實測全掃 9.4 s vs 34.0 s。
 - ⚠️ **I2C 讀一律 Repeated START**（不是 STOP + START），否則 PMBus/SMBus 裝置（VRM、EFUSE）不理。
+- ⚠️ **`settings/*.conf` 的 `VNOM` 是實測中位數，不是規格值**（2026-08-30 起）。它同時是
+  `margin_status` 偏差 % 的分母、也是 `margin_set` 推算 high/low/OV/UV 的基準，所以改它會
+  同時移動「看到的數字」和「實際打出去的電壓」。**跨這個日期的 margin log 不能直接互比。**
+- ⚠️ **SWB 的 margin profile 是 per-CONN 的**：`combo_SWB_CONN13~16_{high,low}` 各自的百分比
+  對應該片板子的軌。套到別的 CONN 會 margin 到錯的軌，而且**不會報錯**。CB 沒有專屬 profile，
+  用通用的 `combo_high3` / `combo_low3`
 - ⚠️ **`margin_save` / `STORE_USER_ALL` 會永久寫 NVM**，斷電保留 → **測試流程中絕不執行**，
   以免覆蓋客戶出廠 config。`margin.sh` 的 auto-enable（`ON_OFF_CONFIG=0x1a`）只改 RAM，斷電復原。
   v2.7.0 新增的 **`margin_save all` / `margin_save blanton` 一次寫 18 個 LTC2977**，