Docs: add Docker Compose runtime guide

[smithaldon1]

Summary

• Adds docs/runtime/DOCKER_COMPOSE.md with Docker Compose startup, shutdown, rebuild, logs, health-check, reset, expected URL, and safety guidance.
• Adds docs/runtime/TROUBLESHOOTING.md for Docker daemon, Demo-Factory, port conflict, Postgres, connector, API, and Workbench failures.
• Links the runtime docs from README, development/testing docs, Workbench docs, and service READMEs.
• Adds doc regression coverage for the required commands, URLs, dependency order, troubleshooting topics, down versus down -v, and read-only safety boundary.

Closes #234

Test evidence

• .venv/bin/python -m pytest services/simulator/tests/test_docker_compose_runtime_docs.py services/simulator/tests/test_runtime_docs_transition.py - 9 passed
• Required docs search: rg -n "docker compose -f infra/docker/docker-compose.yml (up --build|ps|logs -f|down|down -v|config)|cd ../Demo-Factory|curl http://localhost:8000/health" README.md docs/runtime docs/DEVELOPMENT.md docs/TESTING.md apps/web/README.md services - commands present
• docker compose -f infra/docker/docker-compose.yml config - passed
• git diff --check - passed
• make test - 257 passed
• make lint - passed
• make typecheck - passed
• cd apps/web && npm test - 18 passed
• make docs - passed; docs checker not configured yet
• cd apps/web && npm run lint - passed
• cd apps/web && npm run typecheck - passed
• cd apps/web && npm run build - passed

Docs impact

• Adds the new runtime docs under docs/runtime/ and updates required docs/service READMEs to point to them.
• Adds a learning-log entry explaining the Docker Compose runtime documentation and command baseline.

Follow-up work

• Feature: Add Postgres-backed runtime storage #235 through Task: Add Compose smoke test #241 should continue implementing the runtime services, connector worker, Sentinel worker, Workbench/API wording cleanup, and Compose smoke test path.
• This PR intentionally does not implement new Compose services or production deployment documentation.

[smithaldon1]

Reviewed and approved for merge