chore: add community files and PSGallery publish workflow

- Add CONTRIBUTING.md, SECURITY.md, CODE_OF_CONDUCT.md
- Add .gitattributes for line ending normalization
- Add GitHub issue templates (bug report, feature request)
- Add pull request template
- Add publish.yml workflow for PSGallery publication on tag push

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: Report a bug in PSProxmoxVE
+labels: [bug]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for reporting a bug! Please fill out the sections below.
+
+  - type: input
+    id: module-version
+    attributes:
+      label: Module Version
+      description: Output of `(Get-Module PSProxmoxVE).Version`
+      placeholder: "0.1.0"
+    validations:
+      required: true
+
+  - type: input
+    id: pve-version
+    attributes:
+      label: Proxmox VE Version
+      description: PVE server version (e.g. 9.1-1, 8.4-1)
+      placeholder: "9.1-1"
+    validations:
+      required: true
+
+  - type: dropdown
+    id: ps-version
+    attributes:
+      label: PowerShell Version
+      options:
+        - "5.1 (Windows PowerShell)"
+        - "7.2"
+        - "7.4"
+        - "7.5"
+        - "Other"
+    validations:
+      required: true
+
+  - type: dropdown
+    id: os
+    attributes:
+      label: Operating System
+      options:
+        - Windows
+        - Linux
+        - macOS
+    validations:
+      required: true
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: What happened? What did you expect?
+    validations:
+      required: true
+
+  - type: textarea
+    id: repro
+    attributes:
+      label: Steps to Reproduce
+      description: Minimal PowerShell commands to reproduce the issue
+      render: powershell
+    validations:
+      required: true
+
+  - type: textarea
+    id: error
+    attributes:
+      label: Error Output
+      description: Paste any error messages or verbose output
+      render: text

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Suggest a new feature or enhancement
+labels: [enhancement]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for suggesting an improvement! Please describe what you'd like.
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: What feature or improvement would you like?
+    validations:
+      required: true
+
+  - type: textarea
+    id: use-case
+    attributes:
+      label: Use Case
+      description: How would you use this feature? What problem does it solve?
+    validations:
+      required: true
+
+  - type: textarea
+    id: api-endpoints
+    attributes:
+      label: PVE API Endpoints
+      description: If this involves specific PVE API endpoints, list them here
+      placeholder: "GET /nodes/{node}/qemu/{vmid}/firewall/rules"
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives Considered
+      description: Have you considered any workarounds or alternative approaches?

.github/pull_request_template.md

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+## Summary
+
+<!-- Brief description of the change -->
+
+## Type of Change
+
+- [ ] Bug fix
+- [ ] New feature (new cmdlet, new parameter, etc.)
+- [ ] Enhancement (improvement to existing functionality)
+- [ ] Documentation
+- [ ] CI/CD
+- [ ] Refactoring (no functional change)
+
+## Checklist
+
+- [ ] `dotnet build` succeeds with zero warnings
+- [ ] xUnit tests pass (`dotnet test`)
+- [ ] Pester tests pass (`Invoke-Pester -ExcludeTag Integration`)
+- [ ] New cmdlets added to `CmdletsToExport` in `PSProxmoxVE.psd1`
+- [ ] New cmdlets have Pester unit tests
+- [ ] `CHANGELOG.md` updated under `[Unreleased]`
+- [ ] README cmdlet reference updated (if adding new cmdlets)
+
+## PVE API Endpoints
+
+<!-- If this change adds or modifies API calls, list the endpoints -->
+
+## Testing
+
+<!-- How was this tested? Against which PVE version(s)? -->

.github/workflows/publish.yml

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+name: Publish to PSGallery
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+permissions:
+  contents: write
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+
+    steps:
+      - uses: actions/checkout@v5
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: '9.0.x'
+
+      - name: Extract version from tag
+        id: version
+        run: echo "version=${GITHUB_REF_NAME#v}" >> "$GITHUB_OUTPUT"
+
+      - name: Build module
+        run: dotnet publish src/PSProxmoxVE/PSProxmoxVE.csproj --configuration Release --framework netstandard2.0 --output ./publish/netstandard2.0
+
+      - name: Clean publish output
+        run: rm -f ./publish/netstandard2.0/*.deps.json ./publish/netstandard2.0/*.runtimeconfig.json
+
+      - name: Update module version in manifest
+        shell: pwsh
+        run: |
+          $manifestPath = './publish/netstandard2.0/PSProxmoxVE.psd1'
+          $version = '${{ steps.version.outputs.version }}'
+          # Strip prerelease suffix for ModuleVersion (must be X.Y.Z)
+          $moduleVersion = ($version -split '-')[0]
+          $content = Get-Content $manifestPath -Raw
+          $content = $content -replace "ModuleVersion\s*=\s*'[^']*'", "ModuleVersion     = '$moduleVersion'"
+          Set-Content $manifestPath $content
+
+      - name: Install PowerShell and Pester
+        shell: pwsh
+        run: Install-Module -Name Pester -MinimumVersion 5.0 -Force -Scope CurrentUser
+
+      - name: Test module loads
+        shell: pwsh
+        run: |
+          $modulePath = "$HOME/.local/share/powershell/Modules/PSProxmoxVE"
+          New-Item -ItemType Directory -Path $modulePath -Force | Out-Null
+          Copy-Item -Path ./publish/netstandard2.0/* -Destination $modulePath -Recurse -Force
+          Import-Module PSProxmoxVE -Force -ErrorAction Stop
+          $commands = Get-Command -Module PSProxmoxVE
+          Write-Host "Module loaded with $($commands.Count) commands"
+          if ($commands.Count -lt 60) {
+            throw "Expected at least 60 commands, got $($commands.Count)"
+          }
+
+      - name: Publish to PSGallery
+        shell: pwsh
+        env:
+          NUGET_API_KEY: ${{ secrets.PSGALLERY_API_KEY }}
+        run: |
+          Publish-Module -Path ./publish/netstandard2.0 -NuGetApiKey $env:NUGET_API_KEY -Verbose
+
+      - name: Create GitHub Release
+        uses: softprops/action-gh-release@v2
+        with:
+          generate_release_notes: true