Add Cloud Agent development environment for NetDiagram-PS

.cursor/Dockerfile

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+# Cloud Agent base image for NetDiagram-PS.
+# Provides the stable system toolchain: PowerShell 7 (the module targets 7.4+),
+# net-snmp (optional SNMP discovery), and the Linux networking tools the
+# discovery wizard shells out to (ip / arp). Project-level PowerShell modules
+# (Pester, PSScriptAnalyzer) are installed by .cursor/install.sh after checkout.
+FROM ubuntu:24.04
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+        ca-certificates \
+        curl \
+        wget \
+        git \
+        sudo \
+        apt-transport-https \
+        snmp \
+        iproute2 \
+        net-tools \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install PowerShell 7 from Microsoft's package repository for this Ubuntu release.
+RUN . /etc/os-release \
+    && wget -q "https://packages.microsoft.com/config/ubuntu/${VERSION_ID}/packages-microsoft-prod.deb" \
+        -O /tmp/packages-microsoft-prod.deb \
+    && dpkg -i /tmp/packages-microsoft-prod.deb \
+    && rm -f /tmp/packages-microsoft-prod.deb \
+    && apt-get update \
+    && apt-get install -y --no-install-recommends powershell \
+    && rm -rf /var/lib/apt/lists/*
+
+# Passwordless sudo for the default agent user (matches Cursor's conventions).
+RUN echo "ubuntu ALL=(ALL) NOPASSWD:ALL" > /etc/sudoers.d/ubuntu \
+    && chmod 0440 /etc/sudoers.d/ubuntu
+
+USER ubuntu

.cursor/environment.json

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+{
+  "name": "NetDiagram-PS",
+  "build": {
+    "dockerfile": "Dockerfile"
+  },
+  "user": "ubuntu",
+  "install": "bash ./.cursor/install.sh"
+}

.cursor/install.sh

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+#!/usr/bin/env bash
+# Idempotent repository bootstrap for the NetDiagram-PS Cloud Agent environment.
+# Ensures the PowerShell modules required to run the test suite (Pester 5+) and
+# the linter (PSScriptAnalyzer) are available for the current user. Safe to run
+# repeatedly: modules are only installed when missing.
+set -euo pipefail
+
+pwsh -NoLogo -NoProfile -NonInteractive -Command '
+    $ErrorActionPreference = "Stop"
+    Set-PSRepository -Name PSGallery -InstallationPolicy Trusted
+
+    $hasPester = Get-Module -ListAvailable -Name Pester |
+        Where-Object { $_.Version -ge [version]"5.0.0" }
+    if (-not $hasPester) {
+        Write-Host "Installing Pester (>= 5.0.0)..."
+        Install-Module -Name Pester -MinimumVersion 5.0.0 -Force -Scope CurrentUser -SkipPublisherCheck
+    } else {
+        Write-Host "Pester already present: $((($hasPester | Sort-Object Version -Descending)[0]).Version)"
+    }
+
+    if (-not (Get-Module -ListAvailable -Name PSScriptAnalyzer)) {
+        Write-Host "Installing PSScriptAnalyzer..."
+        Install-Module -Name PSScriptAnalyzer -Force -Scope CurrentUser
+    } else {
+        Write-Host "PSScriptAnalyzer already present: $((Get-Module -ListAvailable -Name PSScriptAnalyzer | Sort-Object Version -Descending)[0].Version)"
+    }
+
+    Write-Host "Validating module manifest..."
+    Test-ModuleManifest ./NetDiagram-PS/NetDiagram-PS.psd1 | Out-Null
+    Write-Host "NetDiagram-PS environment bootstrap complete."
+'