feat: add professional deployment ensemble, PowerShell orchestration, and CI standards

.github/CODEOWNERS

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+* @igor04091968

.github/pull_request_template.md

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+## Summary
+
+- what changed
+- why it changed
+- risk and rollback notes
+
+## Checklist
+
+- [ ] No real secrets or credentials committed
+- [ ] Server-side scripts validated (`bash -n`)
+- [ ] PowerShell scripts validated (`Invoke-ScriptAnalyzer`)
+- [ ] Docs updated (full paths and runbook steps)
+- [ ] Rollback steps documented

.github/workflows/ci.yml

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+name: shell-and-powershell-ci
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  shell-check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install shellcheck
+        run: sudo apt-get update && sudo apt-get install -y shellcheck
+
+      - name: Run shellcheck
+        run: |
+          find . -type f -name "*.sh" -print0 | xargs -0 -r shellcheck
+
+  powershell-analyzer:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install PSScriptAnalyzer
+        shell: pwsh
+        run: |
+          Set-PSRepository -Name PSGallery -InstallationPolicy Trusted
+          Install-Module PSScriptAnalyzer -Scope CurrentUser -Force
+
+      - name: Analyze PowerShell scripts
+        shell: pwsh
+        run: |
+          $targets = @(
+            "windows/*.ps1",
+            "windows/*.psm1",
+            "windows/*.psd1"
+          )
+          $issues = Invoke-ScriptAnalyzer -Path $targets -Recurse -Severity Error,Warning
+          if ($issues) {
+            $issues | Format-Table -AutoSize
+            throw "PSScriptAnalyzer detected issues."
+          }