# Platform architecture (summary)

This module aggregates cross-cutting contracts and guardrails that every StellaOps service must follow.

## Anchors
- High-level system view: `../../07_HIGH_LEVEL_ARCHITECTURE.md`
- Platform overview: `architecture-overview.md`
- Aggregation-Only Contract: `../ingestion/aggregation-only-contract.md` (referenced across ingestion/observability docs)

## Scope
- **Identity & tenancy**: Authority-issued OpToks, tenant scoping, RBAC, short TTLs; see Authority module docs.
- **AOC & provenance**: services ingest evidence without mutating/merging; provenance preserved; determinism required.
- **Offline posture**: Offline Kit parity, sealed-mode defaults, deterministic bundles.
- **Observability baseline**: metrics/logging/tracing patterns reused across modules; collectors documented under Telemetry module.
- **Determinism**: stable ordering, UTC timestamps, content-addressed artifacts, reproducible exports.

## Coordination
Platform docs are the starting point for new contributors; keep this summary in sync with module-specific dossiers and sprint references.