Add repo setup: CLAUDE.md, editor config, templates, Dependabot, cloud session hook

.claude/hooks/session-start.sh

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+#!/bin/bash
+# Prepares a Claude Code cloud session so it can build and run the Core tests.
+# Local machines are left alone: there you install the .NET 10 SDK yourself.
+set -euo pipefail
+
+if [ "${CLAUDE_CODE_REMOTE:-}" != "true" ]; then
+  exit 0
+fi
+
+# The dot.net install script is blocked in cloud sessions; the Ubuntu feed works.
+if ! command -v dotnet >/dev/null 2>&1 || ! dotnet --list-sdks | grep -q '^10\.'; then
+  SUDO=""
+  if [ "$(id -u)" -ne 0 ]; then SUDO="sudo"; fi
+  $SUDO apt-get update -qq
+  $SUDO env DEBIAN_FRONTEND=noninteractive apt-get install -y -qq dotnet-sdk-10.0 >/dev/null
+fi
+
+{
+  echo 'export DOTNET_CLI_TELEMETRY_OPTOUT=1'
+  echo 'export DOTNET_NOLOGO=1'
+  echo 'export DOTNET_SKIP_FIRST_TIME_EXPERIENCE=1'
+} >> "${CLAUDE_ENV_FILE:-/dev/null}"
+export DOTNET_CLI_TELEMETRY_OPTOUT=1 DOTNET_NOLOGO=1
+
+cd "${CLAUDE_PROJECT_DIR:-$(dirname "$0")/../..}"
+
+# Restore NuGet packages so the first build/test in the session is quick.
+# WPF and Windows projects restore fine on Linux thanks to EnableWindowsTargeting.
+if [ -f ProDHCPServer.sln ]; then
+  dotnet restore ProDHCPServer.sln --verbosity quiet
+fi

.claude/settings.json

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+{
+  "hooks": {
+    "SessionStart": [
+      {
+        "hooks": [
+          {
+            "type": "command",
+            "command": "$CLAUDE_PROJECT_DIR/.claude/hooks/session-start.sh"
+          }
+        ]
+      }
+    ]
+  }
+}

.editorconfig

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+# Formatting preferences shared by Visual Studio, Rider, VS Code and `dotnet format`.
+# Style rules are suggestions only: the build treats warnings as errors.
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 4
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.{csproj,props,targets,xml,xaml,manifest,json,yml,yaml}]
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false
+
+[*.{sh,py}]
+end_of_line = lf
+
+[*.cs]
+csharp_style_namespace_declarations = file_scoped:suggestion
+csharp_style_var_for_built_in_types = true:suggestion
+csharp_style_var_when_type_is_apparent = true:suggestion
+csharp_new_line_before_open_brace = all
+csharp_prefer_braces = when_multiline:suggestion
+dotnet_sort_system_directives_first = true
+
+dotnet_naming_rule.private_fields_underscore.symbols = private_fields
+dotnet_naming_rule.private_fields_underscore.style = underscore_camel
+dotnet_naming_rule.private_fields_underscore.severity = suggestion
+dotnet_naming_symbols.private_fields.applicable_kinds = field
+dotnet_naming_symbols.private_fields.applicable_accessibilities = private
+dotnet_naming_style.underscore_camel.required_prefix = _
+dotnet_naming_style.underscore_camel.capitalization = camel_case

.gitattributes

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+# Normalise line endings in the repo; Windows checkouts get CRLF where tools expect it.
+* text=auto
+
+*.sln     text eol=crlf
+*.ps1     text eol=crlf
+*.sh      text eol=lf
+*.py      text eol=lf
+
+*.ico     binary
+*.png     binary
+*.gz      binary
+*.exe     binary
+*.dll     binary

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Problem on site
+description: Something went wrong while using ProDHCPServer with real equipment.
+labels: [bug]
+body:
+  - type: textarea
+    id: what-happened
+    attributes:
+      label: What happened
+      description: What you expected, and what you saw instead. Screenshots of the status panel help.
+    validations:
+      required: true
+  - type: input
+    id: device
+    attributes:
+      label: Device(s) connected
+      placeholder: e.g. Q-SYS Core 110f direct, or 3 cameras behind a Netgear GS108
+  - type: input
+    id: version
+    attributes:
+      label: App version
+      description: Shown in the title bar or Settings. The CI run number also works.
+  - type: input
+    id: windows
+    attributes:
+      label: Windows version and adapter
+      placeholder: e.g. Windows 11 24H2, USB-C Realtek adapter
+  - type: dropdown
+    id: adapter-restored
+    attributes:
+      label: Were your adapter settings put back afterwards?
+      options:
+        - "Yes"
+        - "No, I had to fix them by hand"
+        - "Not sure"
+  - type: textarea
+    id: log
+    attributes:
+      label: Session log
+      description: Paste or attach the exported session log if you have one.
+      render: text

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature idea
+description: Something that would make field work quicker or easier.
+labels: [enhancement]
+body:
+  - type: textarea
+    id: situation
+    attributes:
+      label: The situation on site
+      description: What were you trying to do, and with what equipment?
+    validations:
+      required: true
+  - type: textarea
+    id: idea
+    attributes:
+      label: What would help

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: nuget
+    directory: /
+    schedule:
+      interval: monthly
+    groups:
+      nuget-minor-and-patch:
+        update-types: [minor, patch]
+
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: monthly
+    groups:
+      actions:
+        patterns: ["*"]

.github/pull_request_template.md

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+## What changes for the user
+
+Before:
+
+After:
+
+## How
+
+## Testing
+
+- [ ] Core tests pass
+- [ ] Windows CI run is green (integration tests, publish, smoke-test screenshots)
+- [ ] Hardware checklist updated if behaviour on real devices changed

CLAUDE.md

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+# ProDHCPServer: notes for Claude
+
+Windows 10/11 DHCP server tool for AV field technicians. C# on .NET 10, WPF with the Fluent theme, shipped as one self-contained single-file exe (win-x64). The user is an AV tech, not a developer: anything shown in the UI must be plain English with a suggested next step.
+
+## Layout
+
+- `src/ProDHCPServer.Core`: platform-independent logic (DHCP codec and engine, adapter backup/restore lifecycle, status chain, OUI lookup). No Windows APIs here.
+- `src/ProDHCPServer.Windows`: everything that touches the OS (adapters, sockets, ARP, firewall, ping), behind interfaces so Core stays testable with fakes.
+- `src/ProDHCPServer.App`: WPF UI (MVVM with CommunityToolkit.Mvvm), elevation manifest, crash handling.
+- `tests/ProDHCPServer.Core.Tests`: unit tests, run anywhere. `tests/ProDHCPServer.Windows.Tests`: integration tests, Windows only, must never change adapter settings.
+- `docs/hardware-test-phaseN.md`: the manual checklist Simon runs on real hardware at the end of each phase.
+
+## Commands
+
+```
+dotnet test tests/ProDHCPServer.Core.Tests          # works on Linux
+dotnet build ProDHCPServer.sln                      # builds everything, WPF included, on Linux
+dotnet format whitespace ProDHCPServer.sln --verify-no-changes   # formatting check
+dotnet publish src/ProDHCPServer.App -c Release -r win-x64 -o publish   # Windows only in practice
+```
+
+In cloud sessions the SessionStart hook (`.claude/hooks/session-start.sh`) installs the .NET 10 SDK from the Ubuntu feed (the dot.net install script is blocked) and restores packages.
+
+## Rules
+
+- `TreatWarningsAsErrors` is on for every project. Fix warnings; don't suppress them without a comment saying why.
+- Keep Windows calls out of Core. New OS behaviour goes in the Windows project behind an interface, with a fake in the tests.
+- Any change to adapter settings must go through the backup/restore session so Stop, exit and a crash all put the adapter back.
+- The Windows integration tests and the UI (smoke-test screenshots) only run on the Windows CI runner. Check the CI run, not just local Linux tests, before calling a change done.
+- Work is phased (1: core DHCP loop, 2: ping/logging/profiles, 3: discovery). Each phase ends with Simon's hardware test pass before the next one starts. Don't pull later-phase features forward unasked.
+- Builds are downloaded from GitHub Actions artifacts. The exe is not code-signed yet.