[Config] Add coding guidelines and code-fixer agent

Major additions:
- Add CODING_GUIDELINES.md with "NO EMOJIS" rule
- Create code-fixer agent for automated violation fixes
- Add offline mode v2 hooks with local caching/queue
- Add periodic context save with invisible Task Scheduler setup
- Add agent coordination rules and database connection docs

Infrastructure:
- Update hooks: task-complete-v2, user-prompt-submit-v2
- Add periodic_save_check.py for auto-save every 5min
- Add PowerShell scripts: setup_periodic_save.ps1, update_to_invisible.ps1
- Add sync-contexts script for queue synchronization

Documentation:
- OFFLINE_MODE.md, PERIODIC_SAVE_INVISIBLE_SETUP.md
- Migration procedures and verification docs
- Fix flashing window guide

Updates:
- Update agent configs (backup, code-review, coding, database, gitea, testing)
- Update claude.md with coding guidelines reference
- Update .gitignore for new cache/queue directories

Status: Pre-automated-fixer baseline commit

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.claude/hooks/update_to_invisible.ps1

@@ -0,0 +1,85 @@
+# Quick Update - Make Existing Periodic Save Task Invisible
+# This script updates the existing task to run without showing a window
+
+$TaskName = "ClaudeTools - Periodic Context Save"
+
+Write-Host "Updating task '$TaskName' to run invisibly..."
+Write-Host ""
+
+# Check if task exists
+$Task = Get-ScheduledTask -TaskName $TaskName -ErrorAction SilentlyContinue
+if (-not $Task) {
+    Write-Host "ERROR: Task '$TaskName' not found."
+    Write-Host "Run setup_periodic_save.ps1 to create it first."
+    exit 1
+}
+
+# Find pythonw.exe path
+$PythonExe = (Get-Command python).Source
+$PythonDir = Split-Path $PythonExe -Parent
+$PythonwPath = Join-Path $PythonDir "pythonw.exe"
+
+if (-not (Test-Path $PythonwPath)) {
+    Write-Host "ERROR: pythonw.exe not found at $PythonwPath"
+    Write-Host "Please reinstall Python to get pythonw.exe"
+    exit 1
+}
+
+Write-Host "Found pythonw.exe at: $PythonwPath"
+
+# Update the action to use pythonw.exe
+$NewAction = New-ScheduledTaskAction -Execute $PythonwPath `
+    -Argument "D:\ClaudeTools\.claude\hooks\periodic_save_check.py" `
+    -WorkingDirectory "D:\ClaudeTools"
+
+# Update settings to be hidden
+$NewSettings = New-ScheduledTaskSettingsSet `
+    -AllowStartIfOnBatteries `
+    -DontStopIfGoingOnBatteries `
+    -StartWhenAvailable `
+    -ExecutionTimeLimit (New-TimeSpan -Minutes 5) `
+    -Hidden
+
+# Update principal to run in background (S4U = Service-For-User)
+$NewPrincipal = New-ScheduledTaskPrincipal -UserId "$env:USERDOMAIN\$env:USERNAME" -LogonType S4U
+
+# Get existing trigger (preserve it)
+$ExistingTrigger = $Task.Triggers
+
+# Update the task
+Set-ScheduledTask -TaskName $TaskName `
+    -Action $NewAction `
+    -Settings $NewSettings `
+    -Principal $NewPrincipal `
+    -Trigger $ExistingTrigger | Out-Null
+
+Write-Host ""
+Write-Host "[SUCCESS] Task updated successfully!"
+Write-Host ""
+Write-Host "Changes made:"
+Write-Host "  1. Changed executable: python.exe -> pythonw.exe"
+Write-Host "  2. Set task to Hidden"
+Write-Host "  3. Changed LogonType: Interactive -> S4U (background)"
+Write-Host ""
+Write-Host "Verification:"
+
+# Show current settings
+$UpdatedTask = Get-ScheduledTask -TaskName $TaskName
+$Settings = $UpdatedTask.Settings
+$Action = $UpdatedTask.Actions[0]
+$Principal = $UpdatedTask.Principal
+
+Write-Host "  Executable: $($Action.Execute)"
+Write-Host "  Hidden: $($Settings.Hidden)"
+Write-Host "  LogonType: $($Principal.LogonType)"
+Write-Host ""
+
+if ($Settings.Hidden -and $Action.Execute -like "*pythonw.exe" -and $Principal.LogonType -eq "S4U") {
+    Write-Host "[OK] All settings correct - task will run invisibly!"
+} else {
+    Write-Host "[WARNING] Some settings may not be correct - please verify manually"
+}
+
+Write-Host ""
+Write-Host "The task will now run invisibly without showing any console window."
+Write-Host ""