diff --git a/v2/crates/wifi-densepose-sensing-server/src/lib.rs b/v2/crates/wifi-densepose-sensing-server/src/lib.rs
index 2a5bb4ec..fafde8e1 100644
--- a/v2/crates/wifi-densepose-sensing-server/src/lib.rs
+++ b/v2/crates/wifi-densepose-sensing-server/src/lib.rs
@@ -16,6 +16,7 @@ pub mod embedding;
 pub mod graph_transformer;
 pub mod host_validation;
 pub mod introspection;
+pub mod matter;
 pub mod mqtt;
 pub mod path_safety;
 pub mod semantic;
diff --git a/v2/crates/wifi-densepose-sensing-server/src/matter/clusters.rs b/v2/crates/wifi-densepose-sensing-server/src/matter/clusters.rs
new file mode 100644
index 00000000..f5153871
--- /dev/null
+++ b/v2/crates/wifi-densepose-sensing-server/src/matter/clusters.rs
@@ -0,0 +1,329 @@
+//! Matter cluster + device-type ID mappings for RuView entities.
+//!
+//! IDs come from the **Matter Core Spec 1.3 §A.1 Reserved Cluster IDs**
+//! and **§1.3 Device Library**. Where ADR-115 §3.11.1 uses a name,
+//! the constant below carries the spec hex.
+
+use crate::mqtt::discovery::EntityKind;
+
+/// Matter cluster identifier — 32-bit spec ID.
+pub type ClusterId = u32;
+
+/// Matter endpoint device-type identifier — 32-bit spec ID.
+pub type EndpointTypeId = u32;
+
+// ── Matter Core Spec 1.3 — Reserved Cluster IDs we publish ───────────
+/// Per §A.1.4 "OccupancySensing" — boolean occupancy + occupancy
+/// sensor type bitmap.
+pub const CLUSTER_OCCUPANCY_SENSING: ClusterId = 0x0406;
+
+/// Per §A.1.6 "Switch" — momentary press events used to fire fall /
+/// bed-exit / multi-room one-shots.
+pub const CLUSTER_SWITCH: ClusterId = 0x003B;
+
+/// Per §A.1.0 "BasicInformation" — Vendor ID, Product ID, software
+/// version, serial number. Every endpoint includes this.
+pub const CLUSTER_BASIC_INFORMATION: ClusterId = 0x0028;
+
+/// Per §A.1.5 "BooleanState" — single boolean attribute. Used for
+/// non-occupancy boolean primitives (no_movement etc.) where the
+/// occupancy semantics would be misleading to controllers.
+pub const CLUSTER_BOOLEAN_STATE: ClusterId = 0x0045;
+
+/// Per §A.1.16 "BridgedDeviceBasicInformation" — identifies a bridged
+/// device (one per RuView node) on a Matter Bridged Devices Aggregator.
+pub const CLUSTER_BRIDGED_DEVICE_BASIC_INFORMATION: ClusterId = 0x0039;
+
+// ── Matter Device Library 1.3 — Device-type IDs ──────────────────────
+/// Per §7.3 OccupancySensor.
+pub const DEVICE_TYPE_OCCUPANCY_SENSOR: EndpointTypeId = 0x0107;
+/// Per §6.6 GenericSwitch. Used for fall / bed-exit / multi-room events.
+pub const DEVICE_TYPE_GENERIC_SWITCH: EndpointTypeId = 0x000F;
+/// Per §10.2 Aggregator. The top-level endpoint that exposes all
+/// bridged RuView nodes.
+pub const DEVICE_TYPE_AGGREGATOR: EndpointTypeId = 0x000E;
+/// Per §10.1 Bridged Node — one endpoint per RuView physical node.
+pub const DEVICE_TYPE_BRIDGED_NODE: EndpointTypeId = 0x0013;
+
+// ── Vendor-extension attribute (per ADR §3.11.1) ─────────────────────
+/// Vendor-extension attribute carrying `n_persons` on the
+/// OccupancySensing cluster. Apple Home / Google Home will ignore this
+/// gracefully; HA + SmartThings will surface it via the Matter
+/// integration's attribute-renderer.
+///
+/// Attribute IDs ≥ 0xFFF1_0000 are reserved for vendor extensions per
+/// Matter Core §7.18.2. We use 0xFFF1_0001 = "wifi-densepose person
+/// count".
+pub const VENDOR_ATTR_PERSON_COUNT: u32 = 0xFFF1_0001;
+
+/// Spec-defined event ID on the Switch cluster (§A.1.6.5.4).
+pub const EVENT_SWITCH_MULTI_PRESS_COMPLETE: u32 = 0x06;
+
+/// One per `EntityKind` that ADR-115 §3.11.1 maps to Matter. Entities
+/// NOT in the table (HR / BR / pose / motion_energy / presence_score)
+/// are explicitly not exposed over Matter — there are no spec
+/// clusters for them today.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct MatterClusterMapping {
+    /// Which cluster the entity lives on.
+    pub cluster: ClusterId,
+    /// Which device-type the endpoint declares.
+    pub device_type: EndpointTypeId,
+    /// `Some(_)` if the entity emits Matter events (vs. attribute
+    /// reads); `None` if it's read as a cluster attribute.
+    pub event_id: Option<u32>,
+    /// `Some(_)` if the entity uses a vendor-extension attribute
+    /// rather than a spec attribute.
+    pub vendor_attr_id: Option<u32>,
+    /// True iff this entity belongs on the same endpoint as the parent
+    /// node's OccupancySensor (multi-attribute entity grouping).
+    pub shares_occupancy_endpoint: bool,
+}
+
+/// Map an `EntityKind` to its Matter exposure, if any. Returns `None`
+/// for entities that are deliberately MQTT-only because no Matter
+/// cluster represents them (HR / BR / pose / motion_energy / presence_score).
+pub fn matter_mapping(entity: EntityKind) -> Option<MatterClusterMapping> {
+    use EntityKind::*;
+    Some(match entity {
+        Presence | ZoneOccupancy => MatterClusterMapping {
+            cluster: CLUSTER_OCCUPANCY_SENSING,
+            device_type: DEVICE_TYPE_OCCUPANCY_SENSOR,
+            event_id: None,
+            vendor_attr_id: None,
+            shares_occupancy_endpoint: false,
+        },
+        PersonCount => MatterClusterMapping {
+            cluster: CLUSTER_OCCUPANCY_SENSING,
+            device_type: DEVICE_TYPE_OCCUPANCY_SENSOR,
+            event_id: None,
+            vendor_attr_id: Some(VENDOR_ATTR_PERSON_COUNT),
+            shares_occupancy_endpoint: true,
+        },
+        FallDetected | BedExit | MultiRoomTransition => MatterClusterMapping {
+            cluster: CLUSTER_SWITCH,
+            device_type: DEVICE_TYPE_GENERIC_SWITCH,
+            event_id: Some(EVENT_SWITCH_MULTI_PRESS_COMPLETE),
+            vendor_attr_id: None,
+            shares_occupancy_endpoint: false,
+        },
+        // Semantic primitives that surface as occupancy-style booleans
+        // (separate endpoints — one per primitive — so controllers can
+        // bind individual scenes to each).
+        SomeoneSleeping
+        | RoomActive
+        | MeetingInProgress
+        | BathroomOccupied => MatterClusterMapping {
+            cluster: CLUSTER_OCCUPANCY_SENSING,
+            device_type: DEVICE_TYPE_OCCUPANCY_SENSOR,
+            event_id: None,
+            vendor_attr_id: None,
+            shares_occupancy_endpoint: false,
+        },
+        // Problem-state booleans use BooleanState — semantically they
+        // are NOT occupancy, and controllers shouldn't wire them into
+        // motion-light scenes.
+        PossibleDistress | ElderlyInactivityAnomaly | NoMovement => MatterClusterMapping {
+            cluster: CLUSTER_BOOLEAN_STATE,
+            device_type: DEVICE_TYPE_OCCUPANCY_SENSOR,
+            event_id: None,
+            vendor_attr_id: None,
+            shares_occupancy_endpoint: false,
+        },
+        // Fall-risk scalar surfaces as a vendor-extension attribute on
+        // the parent BridgedNode (no Matter spec for risk scores).
+        FallRiskElevated => MatterClusterMapping {
+            cluster: CLUSTER_BRIDGED_DEVICE_BASIC_INFORMATION,
+            device_type: DEVICE_TYPE_BRIDGED_NODE,
+            event_id: None,
+            vendor_attr_id: Some(0xFFF1_0002),
+            shares_occupancy_endpoint: false,
+        },
+        // Explicitly MQTT-only — no Matter cluster representation.
+        BreathingRate | HeartRate | MotionLevel | MotionEnergy | PresenceScore | Rssi | PoseKeypoints => return None,
+    })
+}
+
+/// True iff the entity has a Matter exposure on a current spec cluster.
+pub fn entity_on_matter(entity: EntityKind) -> bool {
+    matter_mapping(entity).is_some()
+}
+
+/// Compute the next available endpoint ID for a node-scoped entity,
+/// given a starting offset (the bridge's first child endpoint). Used
+/// by the publisher to assign per-primitive endpoints deterministically.
+pub fn next_endpoint(base: u16, primitive_index: u16) -> u16 {
+    base.saturating_add(primitive_index)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn presence_maps_to_occupancy_sensor() {
+        let m = matter_mapping(EntityKind::Presence).unwrap();
+        assert_eq!(m.cluster, 0x0406);          // OccupancySensing
+        assert_eq!(m.device_type, 0x0107);      // OccupancySensor
+        assert!(m.event_id.is_none());
+        assert!(m.vendor_attr_id.is_none());
+    }
+
+    #[test]
+    fn zone_occupancy_uses_occupancy_sensor_too() {
+        let m = matter_mapping(EntityKind::ZoneOccupancy).unwrap();
+        assert_eq!(m.cluster, CLUSTER_OCCUPANCY_SENSING);
+        assert_eq!(m.device_type, DEVICE_TYPE_OCCUPANCY_SENSOR);
+    }
+
+    #[test]
+    fn person_count_is_vendor_extension_on_occupancy_endpoint() {
+        let m = matter_mapping(EntityKind::PersonCount).unwrap();
+        assert_eq!(m.cluster, CLUSTER_OCCUPANCY_SENSING);
+        assert_eq!(m.vendor_attr_id, Some(0xFFF1_0001));
+        assert!(m.shares_occupancy_endpoint);
+    }
+
+    #[test]
+    fn fall_uses_switch_multi_press_complete_event() {
+        let m = matter_mapping(EntityKind::FallDetected).unwrap();
+        assert_eq!(m.cluster, CLUSTER_SWITCH);
+        assert_eq!(m.device_type, DEVICE_TYPE_GENERIC_SWITCH);
+        assert_eq!(m.event_id, Some(EVENT_SWITCH_MULTI_PRESS_COMPLETE));
+    }
+
+    #[test]
+    fn bed_exit_uses_switch_event() {
+        let m = matter_mapping(EntityKind::BedExit).unwrap();
+        assert_eq!(m.cluster, CLUSTER_SWITCH);
+        assert!(m.event_id.is_some());
+    }
+
+    #[test]
+    fn multi_room_uses_switch_event() {
+        let m = matter_mapping(EntityKind::MultiRoomTransition).unwrap();
+        assert_eq!(m.cluster, CLUSTER_SWITCH);
+    }
+
+    #[test]
+    fn someone_sleeping_uses_occupancy_separate_endpoint() {
+        let m = matter_mapping(EntityKind::SomeoneSleeping).unwrap();
+        assert_eq!(m.cluster, CLUSTER_OCCUPANCY_SENSING);
+        // NOT shares_occupancy_endpoint — needs its own endpoint so
+        // controllers can wire a "when bedroom_sleeping is on" scene
+        // independently of the raw presence sensor.
+        assert!(!m.shares_occupancy_endpoint);
+    }
+
+    #[test]
+    fn distress_uses_boolean_state_not_occupancy() {
+        // The semantic distinction matters: a controller binding a
+        // "when motion detected, turn lights on" scene must NOT fire
+        // for distress. We use BooleanState to keep them separate.
+        let m = matter_mapping(EntityKind::PossibleDistress).unwrap();
+        assert_eq!(m.cluster, CLUSTER_BOOLEAN_STATE);
+    }
+
+    #[test]
+    fn no_movement_uses_boolean_state() {
+        let m = matter_mapping(EntityKind::NoMovement).unwrap();
+        assert_eq!(m.cluster, CLUSTER_BOOLEAN_STATE);
+    }
+
+    #[test]
+    fn fall_risk_scalar_is_vendor_attribute_on_bridged_node() {
+        let m = matter_mapping(EntityKind::FallRiskElevated).unwrap();
+        assert_eq!(m.cluster, CLUSTER_BRIDGED_DEVICE_BASIC_INFORMATION);
+        assert!(m.vendor_attr_id.is_some());
+    }
+
+    #[test]
+    fn biometric_entities_have_no_matter_exposure() {
+        // ADR §3.11.4 — Matter spec has no clusters for these, so
+        // they're explicitly None.
+        assert!(matter_mapping(EntityKind::HeartRate).is_none());
+        assert!(matter_mapping(EntityKind::BreathingRate).is_none());
+        assert!(matter_mapping(EntityKind::PoseKeypoints).is_none());
+    }
+
+    #[test]
+    fn rssi_and_motion_continuous_are_mqtt_only() {
+        // No standard cluster represents signal strength or continuous
+        // motion-level for a non-light device.
+        assert!(matter_mapping(EntityKind::Rssi).is_none());
+        assert!(matter_mapping(EntityKind::MotionLevel).is_none());
+        assert!(matter_mapping(EntityKind::MotionEnergy).is_none());
+        assert!(matter_mapping(EntityKind::PresenceScore).is_none());
+    }
+
+    #[test]
+    fn next_endpoint_is_deterministic_and_overflow_safe() {
+        assert_eq!(next_endpoint(2, 0), 2);
+        assert_eq!(next_endpoint(2, 5), 7);
+        // Saturation on overflow rather than panic.
+        assert_eq!(next_endpoint(u16::MAX, 1), u16::MAX);
+    }
+
+    #[test]
+    fn entity_on_matter_is_consistent_with_matter_mapping_some() {
+        for e in [
+            EntityKind::Presence,
+            EntityKind::FallDetected,
+            EntityKind::SomeoneSleeping,
+            EntityKind::HeartRate,
+            EntityKind::Rssi,
+        ] {
+            assert_eq!(entity_on_matter(e), matter_mapping(e).is_some());
+        }
+    }
+
+    #[test]
+    fn all_entities_exhaustive_classification() {
+        // Spot-check that every EntityKind variant has a defined
+        // status — either a mapping or an explicit None — so a future
+        // addition can't silently miss the Matter table.
+        let known = [
+            EntityKind::Presence,
+            EntityKind::PersonCount,
+            EntityKind::BreathingRate,
+            EntityKind::HeartRate,
+            EntityKind::MotionLevel,
+            EntityKind::MotionEnergy,
+            EntityKind::FallDetected,
+            EntityKind::PresenceScore,
+            EntityKind::Rssi,
+            EntityKind::ZoneOccupancy,
+            EntityKind::PoseKeypoints,
+            EntityKind::SomeoneSleeping,
+            EntityKind::PossibleDistress,
+            EntityKind::RoomActive,
+            EntityKind::ElderlyInactivityAnomaly,
+            EntityKind::MeetingInProgress,
+            EntityKind::BathroomOccupied,
+            EntityKind::FallRiskElevated,
+            EntityKind::BedExit,
+            EntityKind::NoMovement,
+            EntityKind::MultiRoomTransition,
+        ];
+        // Hit every variant — this acts as a compile-time exhaustiveness
+        // canary: any new EntityKind added without updating
+        // `matter_mapping` will fail to match here.
+        for e in known {
+            let _ = matter_mapping(e); // doesn't panic
+        }
+    }
+
+    #[test]
+    fn cluster_ids_match_matter_spec_1_3() {
+        // Sanity-check the cluster IDs against the published spec
+        // values — catches a transcription typo.
+        assert_eq!(CLUSTER_OCCUPANCY_SENSING, 0x0406);
+        assert_eq!(CLUSTER_SWITCH, 0x003B);
+        assert_eq!(CLUSTER_BOOLEAN_STATE, 0x0045);
+        assert_eq!(CLUSTER_BRIDGED_DEVICE_BASIC_INFORMATION, 0x0039);
+        assert_eq!(DEVICE_TYPE_OCCUPANCY_SENSOR, 0x0107);
+        assert_eq!(DEVICE_TYPE_GENERIC_SWITCH, 0x000F);
+        assert_eq!(DEVICE_TYPE_AGGREGATOR, 0x000E);
+        assert_eq!(DEVICE_TYPE_BRIDGED_NODE, 0x0013);
+    }
+}
diff --git a/v2/crates/wifi-densepose-sensing-server/src/matter/mod.rs b/v2/crates/wifi-densepose-sensing-server/src/matter/mod.rs
new file mode 100644
index 00000000..328e32ea
--- /dev/null
+++ b/v2/crates/wifi-densepose-sensing-server/src/matter/mod.rs
@@ -0,0 +1,36 @@
+//! ADR-115 §3.11 — Matter Bridge (HA-FABRIC) scaffolding.
+//!
+//! This module owns the **Matter device-type and cluster mappings**
+//! independent of any specific Matter SDK. Pure types + lookup tables
+//! land here in v0.7.0; the actual SDK wiring (rs-matter or chip-tool
+//! FFI per §9.10) lands in P7 → P8 in v0.7.1 once the SDK choice is
+//! validated by a pairing spike against Apple Home / Google Home / HA.
+//!
+//! ## Why scaffolding-first
+//!
+//! 1. **Decision principle** (maintainer ACK §9): preserve clean
+//!    protocols, avoid fake semantics, ship MQTT first, validate Matter
+//!    second. This module defines what Matter *would* expose without
+//!    committing to an SDK.
+//! 2. **Reusability**. The mapping table is the same regardless of SDK
+//!    choice — rs-matter and chip-tool both speak in cluster IDs +
+//!    attribute IDs. Defining it here means the SDK swap (if needed
+//!    at P7) is local.
+//! 3. **Testability**. Cluster / attribute / event IDs are well-known
+//!    integers in the Matter spec; we can validate the mapping against
+//!    the spec without a live controller.
+//!
+//! ## Spec versions tracked
+//!
+//! - **Matter Core Spec 1.3** (CSA, 2024) — the surface this module
+//!   targets. ID values below match §1.3 §A.1 Reserved Cluster IDs.
+//!
+//! Future Matter spec revisions that add biometric clusters (HR / BR)
+//! would expand `EntityKind::matter_mapping` to cover them. Today HR /
+//! BR have no Matter cluster and stay MQTT-only.
+
+mod clusters;
+
+pub use clusters::{
+    matter_mapping, ClusterId, EndpointTypeId, MatterClusterMapping,
+};