Standardize and modernize font_sharpener: new script interface, robust backup, EN/RU docs, and CI

.github/workflows/powershell-ci.yml

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+name: PowerShell CI
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  analyze:
+    name: Script analysis (PSScriptAnalyzer)
+    runs-on: windows-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: Run PSScriptAnalyzer (errors only)
+        shell: pwsh
+        run: |
+          Invoke-ScriptAnalyzer -Path . -Recurse -EnableExit -Severity Error
+
+  syntax-check:
+    name: Basic syntax check (-DryRun)
+    runs-on: windows-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: PowerShell 7 check
+        shell: pwsh
+        run: |
+          pwsh -NoProfile -ExecutionPolicy Bypass -File ./FontSharpener.ps1 -DryRun -Verbose
+
+      - name: Windows PowerShell 5.1 check
+        shell: powershell
+        run: |
+          powershell -NoProfile -ExecutionPolicy Bypass -File ./FontSharpener.ps1 -DryRun -Verbose
+
+  publish-readme:
+    name: Publish README artifact
+    runs-on: windows-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Upload README
+        uses: actions/upload-artifact@v4
+        with:
+          name: README
+          path: README.md

.gitignore

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+# OS junk
+.DS_Store
+Thumbs.db
+
+# IDE/editor
+.vscode/
+.idea/
+*.code-workspace
+
+# Logs and temp
+*.log
+*.tmp
+~$*
+
+# PowerShell metadata (optional modules)
+*.psd1
+*.psm1
+
+# Node/other common folders (not used here but harmless)
+node_modules/
+dist/
+build/