build(compose): make root startup the default

.env.example

@@ -0,0 +1,28 @@
+# ThothII Compose defaults. Copy this file to .env in the repository root.
+# The root .env is loaded automatically by Docker Compose; do not put secrets here.
+
+COMPOSE_FILE=compose.yaml
+COMPOSE_PROFILES=
+THT_SECRETS_FILE=deploy/secrets/thothii.secrets
+
+THOTH_HTTP_PORT=8080
+AUTH_MODE=none
+THOTH_PUBLIC_EXPOSURE=false
+MAX_PI_PROCESSES=4
+PI_PROVIDER=
+PI_MODEL=
+PI_THINKING=
+
+# Set these for the selected DWH/vector/embedding adapters.
+THT_DB_NAME=
+THT_DWH_REST_URL=
+THT_VEC_REST_URL=
+THT_OLLAMA_URL=
+THT_DOCS_ROOT=/data/workspaces/example/evidence-source
+
+# Local-vector defaults (used by the optional local-vector overlay).
+THT_VECTOR_DATABASE=thoth
+THT_VECTOR_BOOTSTRAP_USER=postgres
+THT_VECTOR_MIGRATOR_USER=thoth_vector_migrator
+THT_VECTOR_READER_USER=thoth_vector_reader
+THT_VECTOR_WRITER_USER=thoth_vector_writer