feat(scripting): add sprintf2 command and fix prompt-wait race (v0.1.2)

- Add TeraTerm-compatible sprintf2 (C printf formatting into a string var)

- Fix SVOS power-cycle script racing ahead by gating prompt waits behind output-completion markers

- Bump version to 0.1.2; docs and README updates

tools/scripts/test-power_cycle_SVOS.ttl

@@ -0,0 +1,47 @@
+
+prompt_SVOS = "SVOS> "
+
+ip = "192.168.1.21"   ; PDU IP
+device = 1             ; PDU 裝置編號（iPoMan II/III 以 1 為預設）
+port = 1               ; 要測試的插座埠
+act_off = 0
+act_on = 1
+
+; ── 連線 ──
+pduconnect device ip
+if result == 0 then
+    messagebox 'PDU connect failed — 檢查 IP / 網路 / community'
+endif
+
+cnt_total = 0
+while 1
+    ; ── 單埠 OFF → ON 電源循環 ──
+    flushrecv                      ; 清掉上一輪殘留輸出，等待 boot 訊息更乾淨
+    pause 3
+    pductrl device port act_off
+    pause 5
+    pductrl device port act_on
+    pause 3
+
+    wait "Select profile(primary):"
+    sendln "0"
+    wait "ServiceOS login:"
+    sendln "admin"
+
+    wait prompt_SVOS               ; 登入後第一個就緒提示（此處無指令輸出，安全）
+    sendln "version"
+    wait "SHA:"                    ; 先等 version 輸出跑完（最後一行），避免比對到回顯的 "SVOS> version"
+    wait prompt_SVOS
+    sendln "help"
+    wait "more info"               ; 先等 help 輸出跑完，再等就緒提示
+    wait prompt_SVOS
+    sendln "help"
+    wait "more info"
+    wait prompt_SVOS
+
+    cnt_total = cnt_total + 1
+    sprintf2 total_print "====== Total Power Cycle :%d ======" cnt_total
+	sendln total_print
+    wait prompt_SVOS
+endwhile
+