chore: bootstrap repository with governance docs

Initialize git, add Apache-2.0 LICENSE, .gitattributes (LF line
endings), AGENTS.md (entry points, stack, discovery order, baseline
checks), RUNBOOK.md (dev boot, prod deploy with overlay, ingestion,
failures, rollback, scaling notes), .env.prod.example with rotated
credential placeholders, and dev-only warnings on .env.example.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Makefile

@@ -0,0 +1,39 @@
+.PHONY: help up down logs build api worker init smoke test fmt lint
+
+help:
+	@echo "make up        - start all services"
+	@echo "make down      - stop all services"
+	@echo "make build     - rebuild api/worker image"
+	@echo "make init      - run db migrations + bootstrap opensearch + qdrant"
+	@echo "make smoke     - run the smoke test inside the api container"
+	@echo "make test      - pytest"
+	@echo "make logs      - tail api+worker logs"
+
+up:
+	docker compose up -d --build
+
+down:
+	docker compose down
+
+build:
+	docker compose build api worker
+
+logs:
+	docker compose logs -f api worker
+
+init:
+	docker compose exec api python scripts/init_db.py
+	docker compose exec api python scripts/init_opensearch.py
+	docker compose exec api python scripts/init_qdrant.py
+
+smoke:
+	docker compose exec api python scripts/smoke_test.py
+
+test:
+	pytest -q
+
+fmt:
+	ruff format app scripts tests
+
+lint:
+	ruff check app scripts tests