Release 0.4.12: update/reinstall mode and post-install venv repair.

Interactive Setup asks update vs reinstall; elevated install relinks .venv so tray start works under Program Files.

Co-authored-by: Cursor <cursoragent@cursor.com>

packaging/repair_venv.ps1

@@ -0,0 +1,25 @@
+param(
+    [string]$ProgramRoot = "",
+    [string]$DataRoot = ""
+)
+
+# Relink shipped .venv to local python/runtime (run elevated after Setup/update).
+$ErrorActionPreference = "Stop"
+. "$PSScriptRoot\_common.ps1"
+
+$prog = Get-NetxProgramRoot -Override $ProgramRoot
+$data = Get-NetxDataRoot -ProgramRoot $prog -Override $DataRoot
+
+Write-Host "==> Repairing .venv under $prog"
+if (Repair-NetxShippedVenv -ProgramRoot $prog) {
+    $venvPy = Join-Path $prog ".venv\Scripts\python.exe"
+    if (Test-NetxVenvRunnable -VenvPython $venvPy) {
+        Write-Host "==> .venv OK -> bundled python/runtime" -ForegroundColor Green
+        Get-Content (Join-Path $prog ".venv\pyvenv.cfg")
+        exit 0
+    }
+    Write-Host "[ERR] pyvenv.cfg written but venv still not runnable" -ForegroundColor Red
+    exit 2
+}
+Write-Host "[ERR] repair failed (missing runtime/.venv or access denied)" -ForegroundColor Red
+exit 1