JitPack publishing (maven-publish on all modules), docs/USAGE.md, CI + weekly drift probe

.github/workflows/ci.yml

@@ -0,0 +1,17 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: '17'
+      - uses: gradle/actions/setup-gradle@v4
+      - run: ./gradlew build --no-daemon

.github/workflows/drift-probe.yml

@@ -0,0 +1,18 @@
+name: drift probe
+
+on:
+  schedule:
+    - cron: '23 5 * * 1'
+  workflow_dispatch:
+
+jobs:
+  probe:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: '17'
+      - uses: gradle/actions/setup-gradle@v4
+      - run: ./gradlew :engine:runProbe --no-daemon