docs: add harness coding documentation

init.ps1

@@ -0,0 +1,49 @@
+#!/usr/bin/env pwsh
+
+$ErrorActionPreference = "Stop"
+Set-Location -Path $PSScriptRoot
+
+$InstallCmds = @(
+  "Push-Location frontend; npm install; Pop-Location"
+)
+
+$VerifyCmds = @(
+  "go test ./...",
+  "Push-Location frontend; npm run build; Pop-Location",
+  "New-Item -ItemType Directory -Force -Path bin | Out-Null; go build -o bin\cmbone.exe ."
+)
+
+$StartCmd = "wails3 dev"
+
+function Invoke-ProjectCommand {
+  param([string]$Command)
+
+  Write-Host "    $Command"
+  Invoke-Expression $Command
+  if ($LASTEXITCODE -ne 0) {
+    throw "Command failed with exit code ${LASTEXITCODE}: $Command"
+  }
+}
+
+Write-Host "==> 当前目录: $($PWD.Path)"
+
+Write-Host "==> 同步依赖"
+foreach ($cmd in $InstallCmds) {
+  Invoke-ProjectCommand $cmd
+}
+
+Write-Host "==> 运行基础验证"
+foreach ($cmd in $VerifyCmds) {
+  Invoke-ProjectCommand $cmd
+}
+
+Write-Host "==> 启动命令"
+Write-Host "    $StartCmd"
+
+if ($env:RUN_START_COMMAND -eq "1") {
+  Write-Host "==> 启动应用"
+  Invoke-ProjectCommand $StartCmd
+} else {
+  Write-Host "如需直接启动应用，请设置 RUN_START_COMMAND=1。"
+  Write-Host "基础验证失败时，先修复基线，再继续功能开发。"
+}