Add CI release workflow, CHANGELOG.md, issue templates

- .github/workflows/release.yml: on tag push, build exe via PyInstaller,
  package portable zip, attach SHA-256, create GitHub Release.
- CHANGELOG.md: Keep a Changelog format, semver.
- .github/ISSUE_TEMPLATE/: bug_report.yml + feature_request.yml + config.yml
  routing security reports to private advisories.

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,56 @@
+name: Bug report
+description: Something doesn't work as expected
+labels: ["bug"]
+body:
+  - type: input
+    id: version
+    attributes:
+      label: Version
+      description: Visible in the startup banner.
+      placeholder: v1.1.0
+    validations:
+      required: true
+
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to reproduce
+      placeholder: |
+        1. ...
+        2. ...
+        3. ...
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected
+    attributes:
+      label: What you expected to happen
+    validations:
+      required: true
+
+  - type: textarea
+    id: actual
+    attributes:
+      label: What actually happened
+      description: Paste any error output verbatim. Screenshots are welcome.
+    validations:
+      required: true
+
+  - type: input
+    id: os
+    attributes:
+      label: Windows version
+      placeholder: e.g. Windows 11 24H2
+
+  - type: input
+    id: network
+    attributes:
+      label: Network setup (if relevant)
+      placeholder: e.g. USB Realtek NIC to a server's BMC port via an 8-port switch
+
+  - type: textarea
+    id: extra
+    attributes:
+      label: Anything else?
+      description: Workarounds tried, related links, etc.

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Security vulnerability
+    url: https://github.com/Engelgardt23/dhcpsrv/security/advisories/new
+    about: Please report security issues privately via GitHub Security Advisories — not as a public issue.

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -0,0 +1,23 @@
+name: Feature request
+description: Suggest a new feature or an improvement
+labels: ["enhancement"]
+body:
+  - type: textarea
+    id: motivation
+    attributes:
+      label: What's the use case?
+      description: What are you trying to do, and why is the current behavior not enough?
+    validations:
+      required: true
+
+  - type: textarea
+    id: proposal
+    attributes:
+      label: Proposed solution
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered

.github/workflows/release.yml

@@ -0,0 +1,80 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - 'v*.*.*'
+
+permissions:
+  contents: write
+
+jobs:
+  build:
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+
+      - name: Install build dependencies
+        run: python -m pip install --upgrade pip pyinstaller rich
+
+      - name: Resolve version from tag
+        id: ver
+        shell: bash
+        run: echo "version=${GITHUB_REF_NAME#v}" >> "$GITHUB_OUTPUT"
+
+      - name: Build executable
+        run: python -m PyInstaller --onefile --uac-admin --console --name dhcpsrv dhcpsrv_app.py
+
+      - name: Package portable folder
+        shell: pwsh
+        run: |
+          $ver = '${{ steps.ver.outputs.version }}'
+          $folder = "dhcpsrv-v$ver"
+          New-Item -ItemType Directory -Path $folder | Out-Null
+          Copy-Item dist/dhcpsrv.exe $folder/
+          @"
+          dhcpsrv v$ver - portable edition
+          made by engelgardt
+
+          Minimal laptop-side DHCP server for storage/server engineers.
+
+          USAGE
+            Double-click dhcpsrv.exe.
+            Accept the UAC prompt (admin needed to bind UDP/67 and reconfigure the NIC).
+            Pick the NIC plugged into your server/switch - that's the only question.
+            Press Ctrl+C to stop.
+
+          DEFAULTS
+            Server IP : 10.10.10.1/24
+            Pool      : 10.10.10.2 .. 10.10.10.51   (50 addresses)
+            Lease     : 7200 seconds (2 hours)
+            TFTP opt  : server IP
+
+          NOTES
+            - Nothing is installed. Delete the folder to remove.
+            - UAC prompt appears every time (no scheduled-task shortcut in portable mode).
+            - If Tftpd32 has its DHCP module enabled, disable it - UDP/67 is then taken.
+          "@ | Out-File -FilePath "$folder/README.txt" -Encoding UTF8
+          Compress-Archive -Path $folder -DestinationPath "dhcpsrv-portable-v$ver.zip"
+
+      - name: Generate SHA-256 checksum
+        shell: pwsh
+        run: |
+          $ver = '${{ steps.ver.outputs.version }}'
+          $zip = "dhcpsrv-portable-v$ver.zip"
+          $hash = (Get-FileHash -Algorithm SHA256 $zip).Hash.ToLower()
+          "$hash  $zip" | Out-File -FilePath "$zip.sha256" -Encoding ASCII -NoNewline
+          Get-Content "$zip.sha256"
+
+      - name: Create release
+        uses: softprops/action-gh-release@v2
+        with:
+          files: |
+            dhcpsrv-portable-v${{ steps.ver.outputs.version }}.zip
+            dhcpsrv-portable-v${{ steps.ver.outputs.version }}.zip.sha256
+          generate_release_notes: true

CHANGELOG.md

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+# Changelog
+
+All notable changes to **dhcpsrv** are documented in this file.
+
+The format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/), and the project uses [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [1.1.0] - 2026-05-16
+### Added
+- Auto-update check on startup. Polls GitHub `/releases/latest` with a 3-second timeout. If a newer version is available, prints a yellow notice and offers to open the download page in your browser. Silent on offline / API errors.
+
+## [1.0.0] - 2026-05-16
+### Added
+- First public release on GitHub.
+- Single portable `.exe` (~12 MB) — no Python required on target machines.
+- Full-screen TUI built on `rich`: header with server config + live counters (Leases / Pkts / DISCOVER / REQUEST / RELEASE), clients table (`#`, IP, Hostname, MAC, Last seen, Ping), scrolling events panel.
+- Hardcoded sensible defaults: server `10.10.10.1/24`, pool `10.10.10.2..10.10.10.51` (50 addresses), lease `7200 s`, TFTP option (66/150) = server IP.
+- Only one prompt at startup: NIC selection.
+- Adapter filter — only physical wired NICs appear in the picker (no Wi-Fi, VPN, virtual, Hyper-V, VMware, VirtualBox, TAP/TUN, WireGuard, OpenVPN, Tailscale, ZeroTier, Bluetooth, Loopback, WAN Miniport).
+- Reliable ping check via the `TTL=` substring in `ping` output — a real BMC reboot is reflected as red `--`.
+- Pure event-driven UI refresh — no flicker on resize or while idle.
+- Auto-fit clients table to terminal height (`(+N more — enlarge the window)` marker on overflow).
+- Scrollback cleared on startup so mouse-wheel doesn't expose pre-launch text.
+- MIT licensed.
+
+[Unreleased]: https://github.com/Engelgardt23/dhcpsrv/compare/v1.1.0...HEAD
+[1.1.0]: https://github.com/Engelgardt23/dhcpsrv/compare/v1.0.0...v1.1.0
+[1.0.0]: https://github.com/Engelgardt23/dhcpsrv/releases/tag/v1.0.0