🔧 chore(playbook): add vendoring guide and sync scripts

scripts/sync_playbook.bat

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+@echo off
+setlocal enabledelayedexpansion
+
+rem Sync TSL Playbook snapshot to project root.
+rem - Copies docs\standards\tsl_playbook\.agents -> .agents
+rem - Copies docs\standards\tsl_playbook\.gitattributes -> .gitattributes
+rem Existing targets are backed up before overwrite.
+
+for /f "delims=" %%R in ('git rev-parse --show-toplevel 2^>nul') do set "ROOT=%%R"
+if "%ROOT%"=="" set "ROOT=%cd%"
+
+set "SRC=%ROOT%\docs\standards\tsl_playbook"
+set "AGENTS_SRC=%SRC%\.agents"
+set "GITATTR_SRC=%SRC%\.gitattributes"
+set "AGENTS_DST=%ROOT%\.agents"
+set "GITATTR_DST=%ROOT%\.gitattributes"
+
+if not exist "%AGENTS_SRC%" (
+  echo ERROR: Playbook snapshot not found at "%AGENTS_SRC%".
+  echo Run: git subtree add --prefix docs/standards/tsl_playbook ^<playbook-url^> main --squash
+  exit /b 1
+)
+
+if exist "%AGENTS_DST%" (
+  set "RAND=%RANDOM%"
+  set "BAK_NAME=.agents.bak.!RAND!"
+  ren "%AGENTS_DST%" "!BAK_NAME!"
+  echo Backed up existing .agents -> !BAK_NAME!
+)
+
+xcopy "%AGENTS_SRC%" "%AGENTS_DST%\" /e /i /y >nul
+if errorlevel 1 (
+  echo ERROR: failed to copy .agents
+  exit /b 1
+)
+
+echo Synced .agents from Playbook.
+
+if exist "%GITATTR_SRC%" (
+  if exist "%GITATTR_DST%" (
+    set "RAND=%RANDOM%"
+    set "BAK_NAME=.gitattributes.bak.!RAND!"
+    ren "%GITATTR_DST%" "!BAK_NAME!"
+    echo Backed up existing .gitattributes -> !BAK_NAME!
+  )
+  copy /y "%GITATTR_SRC%" "%GITATTR_DST%" >nul
+  echo Synced .gitattributes from Playbook.
+)
+
+echo Done.
+endlocal

scripts/sync_playbook.ps1

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+# Sync TSL Playbook snapshot to project root.
+# - Copies docs/standards/tsl_playbook/.agents -> .agents
+# - Copies docs/standards/tsl_playbook/.gitattributes -> .gitattributes
+# Existing targets are backed up before overwrite.
+
+$ErrorActionPreference = "Stop"
+
+$Root = (git rev-parse --show-toplevel 2>$null)
+if (-not $Root) { $Root = (Get-Location).Path }
+
+$Src = Join-Path $Root "docs/standards/tsl_playbook"
+$AgentsSrc = Join-Path $Src ".agents"
+$GitAttrSrc = Join-Path $Src ".gitattributes"
+
+if (-not (Test-Path $AgentsSrc)) {
+  throw "Playbook snapshot not found at $AgentsSrc. Run git subtree add first."
+}
+
+$timestamp = Get-Date -Format "yyyyMMddHHmmss"
+
+$AgentsDst = Join-Path $Root ".agents"
+if (Test-Path $AgentsDst) {
+  $bak = "$AgentsDst.bak.$timestamp"
+  Move-Item $AgentsDst $bak
+  Write-Host "Backed up existing .agents -> $bak"
+}
+Copy-Item $AgentsSrc $AgentsDst -Recurse -Force
+Write-Host "Synced .agents from Playbook."
+
+$GitAttrDst = Join-Path $Root ".gitattributes"
+if (Test-Path $GitAttrSrc) {
+  if (Test-Path $GitAttrDst) {
+    $bak = "$GitAttrDst.bak.$timestamp"
+    Move-Item $GitAttrDst $bak
+    Write-Host "Backed up existing .gitattributes -> $bak"
+  }
+  Copy-Item $GitAttrSrc $GitAttrDst -Force
+  Write-Host "Synced .gitattributes from Playbook."
+}
+
+Write-Host "Done."

scripts/sync_playbook.sh

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+#!/usr/bin/env sh
+set -eu
+
+# Sync TSL Playbook snapshot to project root.
+# - Copies docs/standards/tsl_playbook/.agents -> .agents
+# - Copies docs/standards/tsl_playbook/.gitattributes -> .gitattributes
+# Existing targets are backed up before overwrite.
+
+ROOT="$(git rev-parse --show-toplevel 2>/dev/null || pwd)"
+SRC="$ROOT/docs/standards/tsl_playbook"
+AGENTS_SRC="$SRC/.agents"
+GITATTR_SRC="$SRC/.gitattributes"
+
+if [ ! -d "$AGENTS_SRC" ]; then
+  echo "ERROR: Playbook snapshot not found at $AGENTS_SRC" >&2
+  echo "Run: git subtree add --prefix docs/standards/tsl_playbook <playbook-url> main --squash" >&2
+  exit 1
+fi
+
+timestamp="$(date +%Y%m%d%H%M%S 2>/dev/null || echo bak)"
+
+AGENTS_DST="$ROOT/.agents"
+if [ -e "$AGENTS_DST" ]; then
+  mv "$AGENTS_DST" "$ROOT/.agents.bak.$timestamp"
+  echo "Backed up existing .agents -> .agents.bak.$timestamp"
+fi
+cp -R "$AGENTS_SRC" "$AGENTS_DST"
+
+echo "Synced .agents from Playbook." 
+
+if [ -f "$GITATTR_SRC" ]; then
+  GITATTR_DST="$ROOT/.gitattributes"
+  if [ -e "$GITATTR_DST" ]; then
+    mv "$GITATTR_DST" "$ROOT/.gitattributes.bak.$timestamp"
+    echo "Backed up existing .gitattributes -> .gitattributes.bak.$timestamp"
+  fi
+  cp "$GITATTR_SRC" "$GITATTR_DST"
+  echo "Synced .gitattributes from Playbook."
+fi
+
+echo "Done."