ci(sonar): SonarCloud scan workflow + project config

.github/workflows/build.yml

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+# SPDX-License-Identifier: MPL-2.0
+# Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk>
+#
+# SonarQube Cloud (SonarCloud) static analysis. Generated from the SonarCloud
+# setup wizard; analysis scope + exclusions live in sonar-project.properties.
+# Requires the SONAR_TOKEN repository secret (Settings -> Secrets and variables
+# -> Actions). Project: https://sonarcloud.io/project/overview?id=hyperpolymath_boj-server
+name: Build
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    types: [opened, synchronize, reopened]
+permissions:
+  contents: read
+jobs:
+  sonarqube:
+    name: SonarQube
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+        with:
+          fetch-depth: 0  # Shallow clones should be disabled for a better relevancy of analysis
+      - name: SonarQube Scan
+        uses: SonarSource/sonarqube-scan-action@7006c4492b2e0ee0f816d36501671557c97f5995 # v8.1.0
+        env:
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}

sonar-project.properties

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+# SPDX-License-Identifier: MPL-2.0
+# SonarQube Cloud (SonarCloud) configuration.
+# Project: https://sonarcloud.io/project/overview?id=hyperpolymath_boj-server
+sonar.organization=hyperpolymath
+sonar.projectKey=hyperpolymath_boj-server
+
+# Analysable surface = the JS MCP bridge + shell scripts. Idris2 / Zig / Elixir
+# / AffineScript have no SonarCloud analyser; vendored, generated, build, proof,
+# and dependency trees are excluded to keep findings signal-rich.
+sonar.exclusions=cartridges/**,ffi/**,generated/**,build/**,**/node_modules/**,elixir/_build/**,elixir/deps/**,external_corpora/**,.lake/**,proofs/**,verification/**,**/*.idr,**/*.zig
+sonar.coverage.exclusions=mcp-bridge/tests/**,**/*test*