feat: add E2E test suite with nightly CI, fix dashboard Dockerfile (#52)

compliance-agent/tests/integration/mod.rs

@@ -1,4 +1,9 @@
-// Integration tests for the compliance-agent crate.
+// E2E / Integration tests for the compliance-agent API.
 //
-// Add tests that exercise the full pipeline, API handlers,
-// and cross-module interactions here.
+// These tests require a running MongoDB instance. Set TEST_MONGODB_URI
+// if it's not at the default `mongodb://root:example@localhost:27017`.
+//
+// Run with:   cargo test -p compliance-agent --test e2e
+// Or nightly: (via CI with MongoDB service container)
+
+mod api;