CI Workflows

Placeholder for future GitHub Actions workflows.

Planned jobs:

Go test for agent/;
gofmt -l and go vet for agent/;
go test -race for Go stage checkpoints or concurrency-heavy changes;
Python tests and migrations for server/;
PostgreSQL constraint tests for server/;
Agent-to-Server integration smoke;
TypeScript check, lint, and build for web/;
OpenAPI validation for api/openapi.yaml.
OpenAPI example payload validation for examples/heartbeat.json and examples/event-batch.json.
Docker Compose smoke for /health, /ready, /metrics, and example ingest.