Set up project scaffolding: GitHub Actions workflows, issue templates, changelog, contributing guidelines, MIT license, and README

.github/dependabot.yml

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+# Dependabot: automatic PRs for dependency updates
+# https://docs.github.com/en/code-security/dependabot
+
+version: 2
+updates:
+  # Gradle dependencies (build.gradle.kts, gradle-wrapper)
+  - package-ecosystem: "gradle"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+    open-pull-requests-limit: 5
+    labels: ["dependencies"]
+    commit-message:
+      prefix: "deps"
+
+  # GitHub Actions (*.yml in .github/workflows)
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+    labels: ["dependencies", "github-actions"]
+    commit-message:
+      prefix: "ci"