feat(simulation): establish polygon S0 qualification

README.md

@@ -121,6 +121,28 @@ performance, direct worker transport and bounded live fan-out remain open. See
 [ADR 0014](docs/adr/0014-bounded-external-perception-worker.md)
 and the [external worker contract](docs/10_EXTERNAL_PERCEPTION_WORKER.md).
 
+## Simulation Polygon
+
+Mission Core now has a parallel Polygon product branch for reproducible
+autonomy qualification. Mission Core owns scenarios, qualification-run
+lifecycle, authority, canonical contracts, provenance and reports; Gazebo, PX4
+SITL, ROS 2, Nav2 and viewers remain replaceable providers. Simulation, replay,
+digital twin, HIL and physical shadow keep distinct causal run kinds.
+
+The current implementation is SIM S0 preflight only. Its strict candidate
+profile fixes D-only worker placement, loopback ports, process ownership,
+Gazebo simulation time and disabled real/direct actuator authority. The doctor
+does not install or launch anything and cannot report `GO` without
+digest-bound target-worker evidence:
+
+```bash
+uv run missioncore-sim s0 doctor --json
+```
+
+See the [Polygon product/SRS](docs/12_SIMULATION_POLYGON_PRODUCT_AND_SRS.md),
+[ADR 0015](docs/adr/0015-simulation-polygon-qualification-boundary.md) and the
+[SIM S0 worker runbook](docs/runbooks/SIM_S0_AI_WORKER.md).
+
 ## Mission Core Control Station and visualization adapters
 
 The browser application is the universal Mission Core Control Station rather than
@@ -219,6 +241,10 @@ standalone release install. The frontend consumes sibling `file:` packages from
 revision or content hash. Publishing/vendoring those packages or enforcing an
 immutable donor revision remains a packaging and CI prerequisite.
 
+Polygon is planned as a seventh section, but UI delivery is gated on the
+accepted clock/frame/authority contracts and a proven S1 backend lifecycle with
+persisted run history. It is not present in the current shell.
+
 The Observation spatial workspace embeds the open-source Rerun Web Viewer
 inside the Mission Core shell. It can open a compatible RRD over same-origin
 HTTP or a Rerun gRPC/proxy source such as