docs: record Ob.temp git history slimming

Ariver

2026-09-01 c773fcdd1f73ca6526e11bb672b8fe33e0339a77

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@echo off
setlocal
set "PS=%SystemRoot%\System32\WindowsPowerShell\v1.0\powershell.exe"
if not exist "%PS%" set "PS=powershell"
"%PS%" -NoProfile -ExecutionPolicy Bypass -File "%~dp0symposium-publish.ps1" %*
exit /b %errorlevel%