diff --git a/v2/Cargo.lock b/v2/Cargo.lock
index d9648e583..06fcee49e 100644
--- a/v2/Cargo.lock
+++ b/v2/Cargo.lock
@@ -9559,6 +9559,16 @@ dependencies = [
  "thiserror 2.0.18",
 ]
 
+[[package]]
+name = "ruview-spatial-evidence"
+version = "0.3.1"
+dependencies = [
+ "ruview-unified",
+ "serde",
+ "serde_json",
+ "thiserror 2.0.18",
+]
+
 [[package]]
 name = "ruview-spatial-memory"
 version = "0.3.1"
diff --git a/v2/Cargo.toml b/v2/Cargo.toml
index 284a32bf7..978a6c9f0 100644
--- a/v2/Cargo.toml
+++ b/v2/Cargo.toml
@@ -126,6 +126,9 @@ members = [
     # ADR-368 — portable compute kernel for the `@ruvnet/ruview-kernel` npm
     # package: one bounded JSON ABI, wasm32 (zero-import) + napi-rs transports.
     "crates/ruview-kernel",
+    # spatial.evidence.v1 emitter (WeftOS ADR-107 wire contract): RF Gaussians
+    # and link measurements as JSONL evidence. Leaf over ruview-unified.
+    "crates/ruview-spatial-evidence",
     # ADR-348 — RuForecast extracted to the ruvnet/RuForecast submodule
     # (see crates/ruforecast in the exclude list below); path-deps only.
 ]
diff --git a/v2/crates/ruview-spatial-evidence/Cargo.toml b/v2/crates/ruview-spatial-evidence/Cargo.toml
new file mode 100644
index 000000000..f2e3024cb
--- /dev/null
+++ b/v2/crates/ruview-spatial-evidence/Cargo.toml
@@ -0,0 +1,25 @@
+[package]
+name = "ruview-spatial-evidence"
+description = "Emit RuView RF Gaussians and link measurements as spatial.evidence.v1 JSONL (WeftOS ADR-107 wire contract)"
+version.workspace = true
+edition.workspace = true
+authors.workspace = true
+license.workspace = true
+repository.workspace = true
+
+# Standalone emitter: the v1 wire shapes are mirrored here with local serde
+# structs, so this crate never depends on the WeftOS consumer. The only
+# internal dependency is `ruview-unified`, the source of the Gaussians and
+# of the Friis free-space reference.
+[dependencies]
+ruview-unified = { path = "../ruview-unified" }
+serde = { workspace = true, features = ["derive"] }
+serde_json.workspace = true
+thiserror.workspace = true
+
+[lints.rust]
+unsafe_code = "forbid"
+missing_docs = "warn"
+
+[lints.clippy]
+all = "warn"
diff --git a/v2/crates/ruview-spatial-evidence/src/gaussian.rs b/v2/crates/ruview-spatial-evidence/src/gaussian.rs
new file mode 100644
index 000000000..6c0773a51
--- /dev/null
+++ b/v2/crates/ruview-spatial-evidence/src/gaussian.rs
@@ -0,0 +1,95 @@
+//! `RfGaussian` / `GaussianMap` to `rf_gaussian` records.
+
+use ruview_unified::gaussian::{GaussianMap, MotionState, RfGaussian};
+
+use crate::wire::{
+    sanitize_id, EvidenceError, EvidenceRecord, Motion, ProofTag, Provenance, RecordBody,
+    RecordMeta, RfGaussianRecord,
+};
+
+/// Source id used when a Gaussian's device id sanitises to nothing.
+const FALLBACK_SOURCE: &str = "ruview-unified";
+/// Bounds for the envelope uncertainty derived from a Gaussian's scale.
+const MIN_UNCERTAINTY_M: f64 = 1e-3;
+const MAX_UNCERTAINTY_M: f64 = 100.0;
+
+/// Caller context for exporting Gaussians.
+#[derive(Debug, Clone, PartialEq)]
+pub struct GaussianExport {
+    /// Urth region id the room frame belongs to.
+    pub region: String,
+    /// Producer id written into provenance.
+    pub producer: String,
+    /// Strongest proof tag the caller claims. A Gaussian with synthetic
+    /// RuView provenance is emitted as `SYNTHETIC` regardless.
+    pub proof: ProofTag,
+}
+
+fn motion(m: MotionState) -> Motion {
+    match m {
+        MotionState::Static => Motion::Static,
+        MotionState::Slow => Motion::Slow,
+        MotionState::Fast => Motion::Fast,
+    }
+}
+
+/// Envelope uncertainty for a Gaussian: the geometric mean of its three
+/// σ, clamped to the v1 range. `RfGaussian` has no separate position
+/// covariance, so its extent is the honest stand-in.
+fn uncertainty(scale: [f64; 3]) -> f64 {
+    let gm = (scale[0] * scale[1] * scale[2]).cbrt();
+    gm.clamp(MIN_UNCERTAINTY_M, MAX_UNCERTAINTY_M)
+}
+
+/// Convert one Gaussian. `index` is its position in the map and makes the
+/// receipt unique within one export.
+pub fn gaussian_to_record(
+    g: &RfGaussian,
+    index: usize,
+    ctx: &GaussianExport,
+) -> Result<EvidenceRecord, EvidenceError> {
+    let source_id = sanitize_id(&g.provenance.device_id, FALLBACK_SOURCE);
+    let proof = if g.provenance.synthetic {
+        ProofTag::Synthetic
+    } else {
+        ctx.proof
+    };
+    let receipt = sanitize_id(
+        &format!("gauss:{source_id}:{}:{index}", g.timestamp_ns),
+        "gauss",
+    );
+    let meta = RecordMeta {
+        t_ns: g.timestamp_ns,
+        region: ctx.region.clone(),
+        source_id,
+        uncertainty_m: uncertainty(g.scale),
+        provenance: Provenance {
+            receipt,
+            producer: ctx.producer.clone(),
+            proof,
+        },
+    };
+    let body = RfGaussianRecord {
+        position: g.position,
+        scale: g.scale,
+        orientation: g.orientation,
+        occupancy: g.occupancy,
+        confidence: g.confidence,
+        motion: motion(g.motion),
+        role: None,
+    };
+    EvidenceRecord::new(meta, RecordBody::RfGaussian(body))
+}
+
+/// Convert every Gaussian in a map, in the map's storage order. Fails on
+/// the first Gaussian that does not satisfy the v1 rules.
+pub fn map_to_records(
+    map: &GaussianMap,
+    ctx: &GaussianExport,
+) -> Result<Vec<EvidenceRecord>, EvidenceError> {
+    map.gaussians()
+        .iter()
+        .enumerate()
+        .map(|(i, g)| gaussian_to_record(g, i, ctx))
+        .collect()
+}
diff --git a/v2/crates/ruview-spatial-evidence/src/lib.rs b/v2/crates/ruview-spatial-evidence/src/lib.rs
new file mode 100644
index 000000000..d443d8e02
--- /dev/null
+++ b/v2/crates/ruview-spatial-evidence/src/lib.rs
@@ -0,0 +1,35 @@
+//! # `ruview-spatial-evidence` — RuView output as `spatial.evidence.v1` JSONL
+//!
+//! `spatial.evidence.v1` is the versioned, one-record-per-line wire format
+//! of the WeftOS spatial evidence engine (WeftOS ADR-107 §7). This crate is
+//! the RuView-side emitter for the two RF record types RuView can produce:
+//!
+//! - [`gaussian`]: `ruview_unified` [`RfGaussian`](ruview_unified::gaussian::RfGaussian)s
+//!   (one by one or a whole [`GaussianMap`](ruview_unified::gaussian::GaussianMap))
+//!   become `rf_gaussian` records.
+//! - [`link`]: a TX/RX link with a measured and a free-space amplitude
+//!   becomes an `rf_link_observation` record carrying `excess_loss_db`.
+//!
+//! The wire shapes live in [`wire`] as local serde structs. Nothing here
+//! depends on WeftOS: the contract is the JSON, not a shared crate.
+//! Every record is validated against the v1 rules before it is serialised
+//! ([`to_line`]), so a bad value fails here rather than in the consumer.
+//!
+//! ## Proof tags
+//!
+//! Each record carries `provenance.proof` (`MEASURED` / `CODE` /
+//! `SYNTHETIC`). A Gaussian whose RuView provenance says `synthetic` is
+//! always emitted as `SYNTHETIC`, whatever the caller asks for; the tag can
+//! be lowered by the caller, never raised.
+
+pub mod gaussian;
+pub mod link;
+pub mod wire;
+
+pub use gaussian::{gaussian_to_record, map_to_records, GaussianExport};
+pub use link::{free_space_amplitude, LinkMeasurement};
+pub use wire::{
+    parse_line, to_jsonl, to_line, EvidenceError, EvidenceRecord, Frame, Motion, ProofTag,
+    Provenance, RecordBody, RecordMeta, RfGaussianRecord, RfLinkObservation, RfRole,
+    MAX_LINE_BYTES, SCHEMA_V1,
+};
diff --git a/v2/crates/ruview-spatial-evidence/src/link.rs b/v2/crates/ruview-spatial-evidence/src/link.rs
new file mode 100644
index 000000000..2bb4b4c58
--- /dev/null
+++ b/v2/crates/ruview-spatial-evidence/src/link.rs
@@ -0,0 +1,81 @@
+//! Link measurements to `rf_link_observation` records.
+
+use ruview_unified::gaussian::{channel_gain, GaussianMap};
+
+use crate::wire::{EvidenceError, EvidenceRecord, RecordBody, RecordMeta, RfLinkObservation};
+
+/// Friis free-space amplitude `λ / (4πd)` between two antennas, taken from
+/// `ruview_unified`'s channel model with an empty map so the reference is
+/// exactly the one RuView's inverse update uses. `None` when the antennas
+/// coincide or the frequency is not a positive finite number.
+pub fn free_space_amplitude(tx: [f64; 3], rx: [f64; 3], freq_hz: f64) -> Option<f64> {
+    let d2: f64 = (0..3).map(|i| (rx[i] - tx[i]).powi(2)).sum();
+    if !(d2.is_finite() && d2 > 1e-18 && freq_hz.is_finite() && freq_hz > 0.0) {
+        return None;
+    }
+    Some(channel_gain(&GaussianMap::new(1.0), tx, rx, freq_hz).norm())
+}
+
+/// One link: geometry plus measured and free-space amplitudes (linear,
+/// same units).
+#[derive(Debug, Clone, PartialEq)]
+pub struct LinkMeasurement {
+    /// Transmitter antenna position, metres.
+    pub tx: [f64; 3],
+    /// Receiver antenna position, metres.
+    pub rx: [f64; 3],
+    /// Carrier frequency, Hz.
+    pub freq_hz: f64,
+    /// Measured amplitude.
+    pub measured_amplitude: f64,
+    /// Free-space (reference) amplitude.
+    pub free_space_amplitude: f64,
+}
+
+impl LinkMeasurement {
+    /// A link whose reference is the Friis amplitude for its geometry.
+    pub fn against_friis(
+        tx: [f64; 3],
+        rx: [f64; 3],
+        freq_hz: f64,
+        measured_amplitude: f64,
+    ) -> Result<Self, EvidenceError> {
+        let free = free_space_amplitude(tx, rx, freq_hz)
+            .ok_or(EvidenceError::OutOfRange("link geometry"))?;
+        Ok(Self {
+            tx,
+            rx,
+            freq_hz,
+            measured_amplitude,
+            free_space_amplitude: free,
+        })
+    }
+
+    /// `20·log10(free / measured)`: positive when the link is weaker than
+    /// free space. Both amplitudes must be positive and finite.
+    pub fn excess_loss_db(&self) -> Result<f64, EvidenceError> {
+        for (v, field) in [
+            (self.measured_amplitude, "measured_amplitude"),
+            (self.free_space_amplitude, "free_space_amplitude"),
+        ] {
+            if !v.is_finite() {
+                return Err(EvidenceError::NonFinite(field));
+            }
+            if v <= 0.0 {
+                return Err(EvidenceError::OutOfRange(field));
+            }
+        }
+        Ok(20.0 * (self.free_space_amplitude / self.measured_amplitude).log10())
+    }
+
+    /// Build a validated `rf_link_observation` record.
+    pub fn to_record(&self, meta: RecordMeta) -> Result<EvidenceRecord, EvidenceError> {
+        let body = RfLinkObservation {
+            tx: self.tx,
+            rx: self.rx,
+            freq_hz: self.freq_hz,
+            excess_loss_db: self.excess_loss_db()?,
+        };
+        EvidenceRecord::new(meta, RecordBody::RfLinkObservation(body))
+    }
+}
diff --git a/v2/crates/ruview-spatial-evidence/src/wire.rs b/v2/crates/ruview-spatial-evidence/src/wire.rs
new file mode 100644
index 000000000..8861079a2
--- /dev/null
+++ b/v2/crates/ruview-spatial-evidence/src/wire.rs
@@ -0,0 +1,333 @@
+//! `spatial.evidence.v1` envelope, the two RF record bodies, and the
+//! boundary validation rules (WeftOS ADR-107 §7).
+//!
+//! Only the RF types RuView emits are mirrored. A line of any other `type`
+//! is rejected by [`parse_line`] here, which is correct for an emitter: it
+//! never needs to read shell, pose or radar lines back.
+
+use serde::{Deserialize, Serialize};
+
+/// The only schema string v1 accepts.
+pub const SCHEMA_V1: &str = "spatial.evidence.v1";
+/// Longest accepted line, bytes.
+pub const MAX_LINE_BYTES: usize = 16 * 1024;
+
+const MAX_COORD_M: f64 = 1_000.0;
+const MAX_UNCERTAINTY_M: f64 = 100.0;
+const MAX_ID_LEN: usize = 128;
+
+/// Why a record was rejected.
+#[derive(Debug, Clone, PartialEq, thiserror::Error)]
+pub enum EvidenceError {
+    /// Not JSON, wrong shape, or an unknown `type`.
+    #[error("parse error: {0}")]
+    Parse(String),
+    /// `schema` missing or not `spatial.evidence.v1`.
+    #[error("unknown schema version {0:?}")]
+    UnknownVersion(String),
+    /// A numeric field is NaN or infinite.
+    #[error("non-finite value in {0}")]
+    NonFinite(&'static str),
+    /// A numeric field is outside its accepted range.
+    #[error("value out of range in {0}")]
+    OutOfRange(&'static str),
+    /// An id is empty, too long, or has disallowed characters.
+    #[error("invalid text in {0}")]
+    BadText(&'static str),
+    /// Line exceeds [`MAX_LINE_BYTES`].
+    #[error("line is {0} bytes, max {MAX_LINE_BYTES}")]
+    LineTooLong(usize),
+}
+
+type R = Result<(), EvidenceError>;
+
+/// Coordinate frame. v1 has one: room-local ENU, origin at the room's SW
+/// floor corner, x east, y north, z up, metres.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum Frame {
+    /// Room ENU.
+    RoomEnu,
+}
+
+/// Proof discipline tag, ordered weakest to strongest.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
+#[serde(rename_all = "SCREAMING_SNAKE_CASE")]
+pub enum ProofTag {
+    /// Simulated or generated.
+    Synthetic,
+    /// Derived by code from other evidence.
+    Code,
+    /// Direct physical measurement with a reproducer.
+    Measured,
+}
+
+/// Where a record came from.
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct Provenance {
+    /// Unique receipt id for this record.
+    pub receipt: String,
+    /// Tool that produced the line (`ruview-spatial-evidence@0.1`, ...).
+    pub producer: String,
+    /// MEASURED / CODE / SYNTHETIC.
+    pub proof: ProofTag,
+}
+
+/// One evidence line: the common envelope plus a flattened typed body.
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct EvidenceRecord {
+    /// Always [`SCHEMA_V1`].
+    pub schema: String,
+    /// Observation time, ns since the Unix epoch.
+    pub t_ns: u64,
+    /// Coordinate frame.
+    pub frame: Frame,
+    /// Urth region id (`region/urth/meso/<room>`).
+    pub region: String,
+    /// Device or operator id (never a person).
+    pub source_id: String,
+    /// 1σ position uncertainty, metres, in (0, 100].
+    pub uncertainty_m: f64,
+    /// Provenance envelope.
+    pub provenance: Provenance,
+    /// `type` tag and type-specific fields.
+    #[serde(flatten)]
+    pub body: RecordBody,
+}
+
+/// Envelope fields a caller supplies for one record.
+#[derive(Debug, Clone, PartialEq)]
+pub struct RecordMeta {
+    /// Observation time, ns since the Unix epoch.
+    pub t_ns: u64,
+    /// Urth region id.
+    pub region: String,
+    /// Device id.
+    pub source_id: String,
+    /// 1σ position uncertainty, metres.
+    pub uncertainty_m: f64,
+    /// Provenance envelope.
+    pub provenance: Provenance,
+}
+
+impl EvidenceRecord {
+    /// Assemble a v1 record and validate it.
+    pub fn new(meta: RecordMeta, body: RecordBody) -> Result<Self, EvidenceError> {
+        let rec = Self {
+            schema: SCHEMA_V1.to_string(),
+            t_ns: meta.t_ns,
+            frame: Frame::RoomEnu,
+            region: meta.region,
+            source_id: meta.source_id,
+            uncertainty_m: meta.uncertainty_m,
+            provenance: meta.provenance,
+            body,
+        };
+        rec.validate()?;
+        Ok(rec)
+    }
+
+    /// Check every field against the v1 rules.
+    pub fn validate(&self) -> R {
+        if self.schema != SCHEMA_V1 {
+            return Err(EvidenceError::UnknownVersion(self.schema.clone()));
+        }
+        id(&self.region, "region")?;
+        id(&self.source_id, "source_id")?;
+        id(&self.provenance.receipt, "provenance.receipt")?;
+        id(&self.provenance.producer, "provenance.producer")?;
+        finite(self.uncertainty_m, "uncertainty_m")?;
+        if !(self.uncertainty_m > 0.0 && self.uncertainty_m <= MAX_UNCERTAINTY_M) {
+            return Err(EvidenceError::OutOfRange("uncertainty_m"));
+        }
+        match &self.body {
+            RecordBody::RfLinkObservation(l) => l.validate(),
+            RecordBody::RfGaussian(g) => g.validate(),
+        }
+    }
+}
+
+/// The record bodies this crate emits, tagged by `"type"`.
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+#[serde(tag = "type", rename_all = "snake_case")]
+pub enum RecordBody {
+    /// One RF link measurement.
+    RfLinkObservation(RfLinkObservation),
+    /// One RF Gaussian (ADR-275 shape).
+    RfGaussian(RfGaussianRecord),
+}
+
+/// Excess attenuation over free space between two antennas.
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct RfLinkObservation {
+    /// Transmitter antenna position, metres.
+    pub tx: [f64; 3],
+    /// Receiver antenna position, metres.
+    pub rx: [f64; 3],
+    /// Carrier frequency, Hz.
+    pub freq_hz: f64,
+    /// Loss beyond Friis, dB (negative = constructive multipath).
+    pub excess_loss_db: f64,
+}
+
+impl RfLinkObservation {
+    fn validate(&self) -> R {
+        point(&self.tx, "tx")?;
+        point(&self.rx, "rx")?;
+        in_range(self.freq_hz, 1e8, 3e11, "freq_hz")?;
+        in_range(self.excess_loss_db, -60.0, 200.0, "excess_loss_db")
+    }
+}
+
+/// Coarse motion class (mirrors `ruview_unified::gaussian::MotionState`).
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum Motion {
+    /// Structural / furniture.
+    Static,
+    /// Breathing, posture shifts.
+    Slow,
+    /// Walking speed or faster.
+    Fast,
+}
+
+/// Role of a Gaussian exported as an RF prior.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum RfRole {
+    /// Attenuates links passing through it.
+    Absorber,
+    /// Dominant reflecting surface.
+    Reflector,
+}
+
+/// Neutral RF Gaussian shape (the fields of `RfGaussian` that cross the wire).
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct RfGaussianRecord {
+    /// Centre, metres.
+    pub position: [f64; 3],
+    /// Per-axis σ, metres.
+    pub scale: [f64; 3],
+    /// Orientation quaternion `[w, x, y, z]`.
+    pub orientation: [f64; 4],
+    /// Peak extinction, nepers/metre.
+    pub occupancy: f64,
+    /// Confidence in `[0, 1]`.
+    pub confidence: f64,
+    /// Motion class.
+    pub motion: Motion,
+    /// Prior role; absent on records RuView emits.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub role: Option<RfRole>,
+}
+
+impl RfGaussianRecord {
+    fn validate(&self) -> R {
+        point(&self.position, "position")?;
+        self.scale
+            .iter()
+            .try_for_each(|s| in_range(*s, 1e-6, 1e4, "scale"))?;
+        self.orientation
+            .iter()
+            .try_for_each(|q| finite(*q, "orientation"))?;
+        let n = self.orientation.iter().map(|q| q * q).sum::<f64>().sqrt();
+        if n <= 1e-6 {
+            return Err(EvidenceError::OutOfRange("orientation"));
+        }
+        in_range(self.occupancy, 0.0, 1e6, "occupancy")?;
+        in_range(self.confidence, 0.0, 1.0, "confidence")
+    }
+}
+
+fn finite(v: f64, field: &'static str) -> R {
+    if v.is_finite() {
+        Ok(())
+    } else {
+        Err(EvidenceError::NonFinite(field))
+    }
+}
+
+fn in_range(v: f64, lo: f64, hi: f64, field: &'static str) -> R {
+    finite(v, field)?;
+    if (lo..=hi).contains(&v) {
+        Ok(())
+    } else {
+        Err(EvidenceError::OutOfRange(field))
+    }
+}
+
+fn point(p: &[f64; 3], field: &'static str) -> R {
+    p.iter()
+        .try_for_each(|v| in_range(*v, -MAX_COORD_M, MAX_COORD_M, field))
+}
+
+/// Ids: ASCII alphanumerics plus `._:/-@`, 1..=128 bytes.
+fn id(s: &str, field: &'static str) -> R {
+    if is_valid_id(s) {
+        Ok(())
+    } else {
+        Err(EvidenceError::BadText(field))
+    }
+}
+
+pub(crate) fn is_id_byte(b: u8) -> bool {
+    b.is_ascii_alphanumeric() || b"._:/-@".contains(&b)
+}
+
+pub(crate) fn is_valid_id(s: &str) -> bool {
+    !s.is_empty() && s.len() <= MAX_ID_LEN && s.bytes().all(is_id_byte)
+}
+
+/// Map arbitrary text to a valid id: disallowed bytes become `-`, the
+/// result is cut to 128 bytes, and empty input yields `fallback`.
+pub(crate) fn sanitize_id(s: &str, fallback: &str) -> String {
+    let out: String = s
+        .bytes()
+        .take(MAX_ID_LEN)
+        .map(|b| if is_id_byte(b) { b as char } else { '-' })
+        .collect();
+    if out.is_empty() {
+        fallback.to_string()
+    } else {
+        out
+    }
+}
+
+/// Validate and serialise one record as a single JSONL line (no newline).
+pub fn to_line(rec: &EvidenceRecord) -> Result<String, EvidenceError> {
+    rec.validate()?;
+    let line = serde_json::to_string(rec).map_err(|e| EvidenceError::Parse(e.to_string()))?;
+    if line.len() > MAX_LINE_BYTES {
+        return Err(EvidenceError::LineTooLong(line.len()));
+    }
+    Ok(line)
+}
+
+/// Serialise records as a JSONL document, one line each with a trailing
+/// newline. Fails on the first invalid record, so no partial file is built.
+pub fn to_jsonl(records: &[EvidenceRecord]) -> Result<String, EvidenceError> {
+    let mut out = String::new();
+    for rec in records {
+        out.push_str(&to_line(rec)?);
+        out.push('\n');
+    }
+    Ok(out)
+}
+
+/// Parse and validate one line of a type this crate mirrors.
+pub fn parse_line(line: &str) -> Result<EvidenceRecord, EvidenceError> {
+    if line.len() > MAX_LINE_BYTES {
+        return Err(EvidenceError::LineTooLong(line.len()));
+    }
+    let value: serde_json::Value =
+        serde_json::from_str(line).map_err(|e| EvidenceError::Parse(e.to_string()))?;
+    match value.get("schema").and_then(|s| s.as_str()) {
+        Some(SCHEMA_V1) => {}
+        Some(other) => return Err(EvidenceError::UnknownVersion(other.to_string())),
+        None => return Err(EvidenceError::UnknownVersion(String::new())),
+    }
+    let rec: EvidenceRecord =
+        serde_json::from_value(value).map_err(|e| EvidenceError::Parse(e.to_string()))?;
+    rec.validate()?;
+    Ok(rec)
+}
diff --git a/v2/crates/ruview-spatial-evidence/tests/evidence.rs b/v2/crates/ruview-spatial-evidence/tests/evidence.rs
new file mode 100644
index 000000000..3ca2f4cfc
--- /dev/null
+++ b/v2/crates/ruview-spatial-evidence/tests/evidence.rs
@@ -0,0 +1,339 @@
+//! Wire-contract tests: golden lines match the WeftOS ADR-107 §7 examples,
+//! conversions mirror their sources, and invalid values never serialise.
+
+use ruview_spatial_evidence::{
+    free_space_amplitude, gaussian_to_record, map_to_records, parse_line, to_jsonl, to_line,
+    EvidenceError, GaussianExport, LinkMeasurement, Motion, ProofTag, Provenance, RecordBody,
+    RecordMeta,
+};
+use ruview_unified::gaussian::{GaussianMap, MotionState, Provenance as UProv, RfGaussian};
+use serde_json::Value;
+
+/// ADR-107 §7 example lines for the two RF types, verbatim.
+const ADR_RF_LINK: &str = r#"{"schema":"spatial.evidence.v1","type":"rf_link_observation","t_ns":1759500001300000000,"frame":"room_enu","region":"region/urth/meso/test-room","source_id":"node-2","uncertainty_m":1.0,"provenance":{"receipt":"csi:node1-node2:000881","producer":"ruview-adapter@0.1","proof":"MEASURED"},"tx":[6.20,3.50,1.10],"rx":[0.20,0.20,1.10],"freq_hz":2437000000.0,"excess_loss_db":4.2}"#;
+const ADR_RF_GAUSSIAN: &str = r#"{"schema":"spatial.evidence.v1","type":"rf_gaussian","t_ns":1759500002000000000,"frame":"room_enu","region":"region/urth/meso/test-room","source_id":"ruview-unified","uncertainty_m":0.5,"provenance":{"receipt":"gauss:7f3a","producer":"ruview-unified@0.3","proof":"CODE"},"position":[3.2,0.0,1.2],"scale":[0.05,1.6,1.2],"orientation":[1,0,0,0],"occupancy":0.7,"confidence":0.8,"motion":"static","role":"absorber"}"#;
+
+const REGION: &str = "region/urth/meso/test-room";
+
+fn meta(
+    t_ns: u64,
+    source: &str,
+    unc: f64,
+    receipt: &str,
+    producer: &str,
+    proof: ProofTag,
+) -> RecordMeta {
+    RecordMeta {
+        t_ns,
+        region: REGION.into(),
+        source_id: source.into(),
+        uncertainty_m: unc,
+        provenance: Provenance {
+            receipt: receipt.into(),
+            producer: producer.into(),
+            proof,
+        },
+    }
+}
+
+/// Parse JSON with every number as f64, so `1` and `1.0` compare equal.
+fn json(s: &str) -> Value {
+    fn norm(v: Value) -> Value {
+        match v {
+            Value::Number(n) => Value::from(n.as_f64().expect("finite")),
+            Value::Array(a) => Value::Array(a.into_iter().map(norm).collect()),
+            Value::Object(o) => Value::Object(o.into_iter().map(|(k, v)| (k, norm(v))).collect()),
+            other => other,
+        }
+    }
+    norm(serde_json::from_str(s).expect("json"))
+}
+
+fn gaussian(device: &str, synthetic: bool) -> RfGaussian {
+    RfGaussian::new(
+        [3.2, 0.0, 1.2],
+        [0.05, 1.6, 1.2],
+        [1.0, 0.0, 0.0, 0.0],
+        0.7,
+        0.8,
+        1_759_500_002_000_000_000,
+        300.0,
+        UProv {
+            device_id: device.into(),
+            model_version: 3,
+            synthetic,
+        },
+    )
+    .expect("valid gaussian")
+}
+
+fn export(proof: ProofTag) -> GaussianExport {
+    GaussianExport {
+        region: REGION.into(),
+        producer: "ruview-unified@0.3".into(),
+        proof,
+    }
+}
+
+#[test]
+fn adr_examples_parse_and_reserialise_to_the_same_shape() {
+    for line in [ADR_RF_LINK, ADR_RF_GAUSSIAN] {
+        let rec = parse_line(line).expect("ADR example parses");
+        assert_eq!(json(&to_line(&rec).unwrap()), json(line));
+    }
+}
+
+#[test]
+fn golden_rf_link_line_matches_adr_example() {
+    let m = LinkMeasurement {
+        tx: [6.20, 3.50, 1.10],
+        rx: [0.20, 0.20, 1.10],
+        freq_hz: 2_437_000_000.0,
+        measured_amplitude: 1.0,
+        free_space_amplitude: 10f64.powf(4.2 / 20.0),
+    };
+    let rec = m
+        .to_record(meta(
+            1_759_500_001_300_000_000,
+            "node-2",
+            1.0,
+            "csi:node1-node2:000881",
+            "ruview-adapter@0.1",
+            ProofTag::Measured,
+        ))
+        .unwrap();
+    let mut got = json(&to_line(&rec).unwrap());
+    // Float round-off in 20·log10(10^(4.2/20)): compare that field numerically.
+    let loss = got["excess_loss_db"].as_f64().unwrap();
+    assert!((loss - 4.2).abs() < 1e-12);
+    got["excess_loss_db"] = json("4.2");
+    assert_eq!(got, json(ADR_RF_LINK));
+}
+
+#[test]
+fn golden_rf_gaussian_line_matches_adr_example_except_role() {
+    let rec = gaussian_to_record(
+        &gaussian("ruview-unified", false),
+        0,
+        &export(ProofTag::Code),
+    )
+    .unwrap();
+    let line = to_line(&rec).unwrap();
+    assert_eq!(
+        line,
+        r#"{"schema":"spatial.evidence.v1","t_ns":1759500002000000000,"frame":"room_enu","region":"region/urth/meso/test-room","source_id":"ruview-unified","uncertainty_m":0.45788569702133275,"provenance":{"receipt":"gauss:ruview-unified:1759500002000000000:0","producer":"ruview-unified@0.3","proof":"CODE"},"type":"rf_gaussian","position":[3.2,0.0,1.2],"scale":[0.05,1.6,1.2],"orientation":[1.0,0.0,0.0,0.0],"occupancy":0.7,"confidence":0.8,"motion":"static"}"#
+    );
+    // Same field set as the ADR example once the export-only `role` and
+    // the per-record receipt/uncertainty are aligned.
+    let mut got = json(&line);
+    let want = json(ADR_RF_GAUSSIAN);
+    got["role"] = want["role"].clone();
+    got["provenance"]["receipt"] = want["provenance"]["receipt"].clone();
+    got["uncertainty_m"] = want["uncertainty_m"].clone();
+    assert_eq!(got, want);
+}
+
+#[test]
+fn synthetic_gaussian_cannot_be_raised_to_measured() {
+    let rec = gaussian_to_record(&gaussian("sim", true), 0, &export(ProofTag::Measured)).unwrap();
+    assert_eq!(rec.provenance.proof, ProofTag::Synthetic);
+    let rec =
+        gaussian_to_record(&gaussian("esp32-node-1", false), 0, &export(ProofTag::Code)).unwrap();
+    assert_eq!(rec.provenance.proof, ProofTag::Code);
+}
+
+#[test]
+fn device_id_is_sanitised_into_a_valid_source_id() {
+    let rec = gaussian_to_record(
+        &gaussian("node 1 (kitchen)", false),
+        4,
+        &export(ProofTag::Code),
+    )
+    .unwrap();
+    assert_eq!(rec.source_id, "node-1--kitchen-");
+    let rec = gaussian_to_record(&gaussian("", false), 0, &export(ProofTag::Code)).unwrap();
+    assert_eq!(rec.source_id, "ruview-unified");
+    assert!(to_line(&rec).is_ok());
+}
+
+#[test]
+fn map_export_mirrors_every_gaussian_and_motion_class() {
+    let mut map = GaussianMap::new(1.0);
+    let mut moving = gaussian("node-5", false);
+    moving.position = [1.0, 1.0, 1.0];
+    moving.scale = [0.3, 0.3, 0.9];
+    moving.motion = MotionState::Fast;
+    map.insert(gaussian("node-1", false));
+    map.insert(moving);
+    let recs = map_to_records(&map, &export(ProofTag::Code)).unwrap();
+    assert_eq!(recs.len(), map.len());
+    for (rec, g) in recs.iter().zip(map.gaussians()) {
+        let RecordBody::RfGaussian(body) = &rec.body else {
+            panic!("wrong type")
+        };
+        assert_eq!(body.position, g.position);
+        assert_eq!(body.scale, g.scale);
+        assert_eq!(body.orientation, g.orientation);
+        assert_eq!(rec.t_ns, g.timestamp_ns);
+    }
+    assert!(recs
+        .iter()
+        .any(|r| matches!(&r.body, RecordBody::RfGaussian(b) if b.motion == Motion::Fast)));
+    // Deterministic, newline-terminated JSONL that parses back line by line.
+    let doc = to_jsonl(&recs).unwrap();
+    assert_eq!(
+        doc,
+        to_jsonl(&map_to_records(&map, &export(ProofTag::Code)).unwrap()).unwrap()
+    );
+    // serde_json's default float parse may differ by one ulp, so compare
+    // the uncertainty numerically and everything else exactly.
+    let back: Vec<_> = doc.lines().map(|l| parse_line(l).unwrap()).collect();
+    assert_eq!(back.len(), recs.len());
+    for (b, r) in back.iter().zip(&recs) {
+        assert!((b.uncertainty_m - r.uncertainty_m).abs() < 1e-12);
+        assert_eq!(
+            (&b.body, &b.provenance, b.t_ns),
+            (&r.body, &r.provenance, r.t_ns)
+        );
+    }
+}
+
+#[test]
+fn friis_reference_and_excess_loss() {
+    let (tx, rx, f) = ([0.4, 0.4, 0.9], [6.2, 3.46, 0.91], 2.437e9);
+    let d = ((5.8f64).powi(2) + 3.06f64.powi(2) + 0.01f64.powi(2)).sqrt();
+    let want = 299_792_458.0 / f / (4.0 * std::f64::consts::PI * d);
+    let free = free_space_amplitude(tx, rx, f).unwrap();
+    assert!((free - want).abs() / want < 1e-9);
+    assert_eq!(free_space_amplitude(tx, tx, f), None);
+    assert_eq!(free_space_amplitude(tx, rx, f64::NAN), None);
+
+    let at_free = LinkMeasurement::against_friis(tx, rx, f, free).unwrap();
+    assert!(at_free.excess_loss_db().unwrap().abs() < 1e-12);
+    let halved = LinkMeasurement::against_friis(tx, rx, f, free / 2.0).unwrap();
+    assert!((halved.excess_loss_db().unwrap() - 6.020_599_913).abs() < 1e-6);
+    let stronger = LinkMeasurement::against_friis(tx, rx, f, free * 2.0).unwrap();
+    assert!(stronger.excess_loss_db().unwrap() < 0.0);
+}
+
+#[test]
+fn bad_link_amplitudes_and_out_of_range_loss_are_rejected() {
+    let base = LinkMeasurement {
+        tx: [0.0; 3],
+        rx: [1.0, 0.0, 0.0],
+        freq_hz: 2.437e9,
+        measured_amplitude: 1.0,
+        free_space_amplitude: 1.0,
+    };
+    let m = |measured: f64, free: f64| LinkMeasurement {
+        measured_amplitude: measured,
+        free_space_amplitude: free,
+        ..base.clone()
+    };
+    let mk = || meta(1, "node-1", 1.0, "r-1", "p@0.1", ProofTag::Code);
+    assert_eq!(
+        m(0.0, 1.0).excess_loss_db(),
+        Err(EvidenceError::OutOfRange("measured_amplitude"))
+    );
+    assert_eq!(
+        m(f64::NAN, 1.0).excess_loss_db(),
+        Err(EvidenceError::NonFinite("measured_amplitude"))
+    );
+    assert_eq!(
+        m(1.0, -1.0).excess_loss_db(),
+        Err(EvidenceError::OutOfRange("free_space_amplitude"))
+    );
+    // 1e-11 below free space is 220 dB: outside the v1 range [-60, 200].
+    assert_eq!(
+        m(1e-11, 1.0).to_record(mk()),
+        Err(EvidenceError::OutOfRange("excess_loss_db"))
+    );
+    let far = LinkMeasurement {
+        tx: [0.0, 0.0, 2000.0],
+        ..base.clone()
+    };
+    assert_eq!(far.to_record(mk()), Err(EvidenceError::OutOfRange("tx")));
+    let low = LinkMeasurement {
+        freq_hz: 1e6,
+        ..base
+    };
+    assert_eq!(
+        low.to_record(mk()),
+        Err(EvidenceError::OutOfRange("freq_hz"))
+    );
+}
+
+#[test]
+fn envelope_rules_match_v1() {
+    let link = LinkMeasurement {
+        tx: [0.0; 3],
+        rx: [1.0, 0.0, 0.0],
+        freq_hz: 2.437e9,
+        measured_amplitude: 1.0,
+        free_space_amplitude: 1.0,
+    };
+    let rec = |src: &str, unc: f64, receipt: &str| {
+        link.to_record(meta(1, src, unc, receipt, "p@0.1", ProofTag::Code))
+    };
+    assert_eq!(
+        rec("node 1", 1.0, "r"),
+        Err(EvidenceError::BadText("source_id"))
+    );
+    assert_eq!(rec("", 1.0, "r"), Err(EvidenceError::BadText("source_id")));
+    assert_eq!(
+        rec(&"a".repeat(129), 1.0, "r"),
+        Err(EvidenceError::BadText("source_id"))
+    );
+    assert_eq!(
+        rec("n", 0.0, "r"),
+        Err(EvidenceError::OutOfRange("uncertainty_m"))
+    );
+    assert_eq!(
+        rec("n", 100.5, "r"),
+        Err(EvidenceError::OutOfRange("uncertainty_m"))
+    );
+    assert_eq!(
+        rec("n", f64::INFINITY, "r"),
+        Err(EvidenceError::NonFinite("uncertainty_m"))
+    );
+    assert_eq!(
+        rec("n", 1.0, "bad\nreceipt"),
+        Err(EvidenceError::BadText("provenance.receipt"))
+    );
+}
+
+#[test]
+fn parse_line_rejects_wrong_version_type_overflow_and_length() {
+    let v2 = ADR_RF_LINK.replace("spatial.evidence.v1", "spatial.evidence.v2");
+    assert_eq!(
+        parse_line(&v2),
+        Err(EvidenceError::UnknownVersion("spatial.evidence.v2".into()))
+    );
+    let unschema = ADR_RF_LINK.replace(r#""schema":"spatial.evidence.v1","#, "");
+    assert_eq!(
+        parse_line(&unschema),
+        Err(EvidenceError::UnknownVersion(String::new()))
+    );
+    let unknown = ADR_RF_LINK.replace("rf_link_observation", "rf_teleport");
+    assert!(matches!(parse_line(&unknown), Err(EvidenceError::Parse(_))));
+    let overflow = ADR_RF_LINK.replace("4.2}", "1e999}");
+    assert!(matches!(
+        parse_line(&overflow),
+        Err(EvidenceError::Parse(_))
+    ));
+    let bad_quat = ADR_RF_GAUSSIAN.replace("[1,0,0,0]", "[0,0,0,0]");
+    assert_eq!(
+        parse_line(&bad_quat),
+        Err(EvidenceError::OutOfRange("orientation"))
+    );
+    let bad_conf = ADR_RF_GAUSSIAN.replace("\"confidence\":0.8", "\"confidence\":1.5");
+    assert_eq!(
+        parse_line(&bad_conf),
+        Err(EvidenceError::OutOfRange("confidence"))
+    );
+    let long = format!("{}{}", ADR_RF_LINK, " ".repeat(16 * 1024));
+    assert!(matches!(
+        parse_line(&long),
+        Err(EvidenceError::LineTooLong(_))
+    ));
+}