docs(openspec): archive phase3c gateway contracts

2026-07-30 07:38:39 +07:00
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+## Why
+
+Gateway heartbeat currently carries active sessions and one egress rate but cannot transport the required observed process and provider-path telemetry.
+
+## What Changes
+
+- Add one required bounded low-cardinality telemetry object to authenticated gateway heartbeat.
+- Cover counters, delay totals/samples, control RTT/loss/jitter, pending reliability, reconnects, and provider state.
+- Keep configured capacity exclusively in registration and measured egress in heartbeat.
+
+## Capabilities
+
+### New Capabilities
+
+- `gateway-heartbeat-telemetry`: Authenticated heartbeats carry bounded observed gateway telemetry without routes, sessions, credentials, or payload data.
+
+### Modified Capabilities
+
+None.
+
+## Impact
+
+The control-v1 schema, generated Go/Rust/Swift bindings, conformance checks, and both unpublished consumers require coordinated local updates. RC6 remains unchanged.