docs: add LRK contract family note

docs/lrk-contract-family.md

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+# LRK Contract Family
+
+This document describes the LRK / Semantic Holography contract family that augments the SourceOS/SociOS typed contract layer.
+
+## Contract family
+
+- `TriuneRPC` — canonical action / provenance envelope for semantic and runtime transitions
+- `ProofOfLife` — heartbeat attestation bound to policy hash and slot identity
+- `LifeMirrorState` — lifecycle state for liveness/tamper escalation
+- `B11Surface` — typed, attestable surface for semantic/runtime publication
+- `DeltaSurface` — typed comparison object for attested surface deltas
+
+## Why these are a family
+
+These types are cohesive because they all represent:
+
+1. an observable boundary object,
+2. a local or distributed trust transition,
+3. a machine-validated shape that downstream runtimes must agree on.
+
+## Recommended catalog updates
+
+When this family lands, update:
+- `README.md` schema families section
+- `schemas/README.md` quick reference and family listing
+- semantic context material if/when these become first-class linked data terms
+
+## Downstream consumers
+
+- `agentos-starter` surface collectors and LRK runtime package
+- `workstation-contracts` validation lanes
+- `agentos-spine` runtime state binding and publication