feat(relation): refuse a summary as the source identity

ARCHITECTURE.md

@@ -61,6 +61,7 @@ boundaries above remain the target modular MSA architecture.
 | `tepp_simulation` | known-truth temporal/event data generation |
 | `validation_core` | RMSE, bias, coverage, graph, and Monte Carlo metrics |
 | `tepp_api` | versioned DTO, schema, and export contracts |
+| `summarizes_edge` | a summary is not a state transition and not the source document |
 | `outcome_order` | input-process-outcome edges cannot move backward in event time |
 | `retrospective_edge` | retrospective reporting cannot become a transition or a translation |
 | `payload_bound` | untrusted documents, records, checkpoints, and LLM outputs fail closed without identity, provenance, size, and depth |

CHANGELOG.md

@@ -6,6 +6,8 @@ All notable changes to TEPP are documented here. The format follows Keep a Chang
 
 ### Added
 
+- `summarizes_edge` identity gate: a summary may point to earlier event time but cannot become a state transition or reuse the source document identity; recovered summary kinds match known truth at a higher computed rate than collapsing every summary to the source (ADR 0003).
+- `persistence_postgres` retention/deletion/legal-hold (migration `0007`): policy rows, legal holds that block completed deletion, evidence tombstones without raw-source restore, analysis exclusion only for `logical_revocation`/`identity_tombstone` (not `cache_export_removal`), and deletion requests bound to the cited retention policy's tenant/class/purpose.
 - `outcome_order` identity gate: `input_to` and `process_to` cannot move backward or stay contemporaneous in event-time rank; `outcome_of` may point at an earlier producer and cannot become a state transition; recovered kinds match known truth at a higher computed rate than collapsing every kind to `input_to` (ADR 0002/0003).
 - `persistence_postgres` retention/deletion/legal-hold (migration `0007`): policy rows, legal holds that block completed deletion, evidence tombstones without raw-source restore, analysis exclusion only for `logical_revocation`/`identity_tombstone` (not `cache_export_removal`), and deletion requests bound to the cited retention policy's tenant/class/purpose.
 - `retrospective_edge` identity gate: retrospective reporting may point to earlier event time but cannot become a state transition or a translation; recovered reporting kinds match known truth at a higher computed rate than collapsing every report to a contemporaneous forward report (ADR 0002/0003).

Cargo.toml

@@ -11,6 +11,7 @@ members = [
     "crates/tepp_simulation",
     "crates/validation_core",
     "crates/tepp_api",
+    "crates/summarizes_edge",
     "crates/outcome_order",
     "crates/retrospective_edge",
     "crates/payload_bound",
@@ -50,6 +51,7 @@ default-members = [
     "crates/tepp_simulation",
     "crates/validation_core",
     "crates/tepp_api",
+    "crates/summarizes_edge",
     "crates/outcome_order",
     "crates/retrospective_edge",
     "crates/payload_bound",

README.md

@@ -42,6 +42,7 @@ crates/corpus_split
 crates/tepp_simulation
 crates/validation_core
 crates/tepp_api
+crates/summarizes_edge
 crates/outcome_order
 crates/retrospective_edge
 crates/payload_bound

crates/summarizes_edge/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "summarizes_edge"
+description = "A summary is not a state transition and not the source document."
+version.workspace = true
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+authors.workspace = true
+repository.workspace = true
+homepage.workspace = true
+readme.workspace = true
+keywords.workspace = true
+categories.workspace = true
+publish = false
+
+[lints]
+workspace = true

crates/summarizes_edge/src/error.rs

@@ -0,0 +1,53 @@
+//! Fail-closed summarizes-edge errors.
+
+use std::fmt;
+
+/// A fail-closed summarizes-edge error.
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+#[non_exhaustive]
+pub enum SummarizesEdgeError {
+    /// A summary was treated as a state transition.
+    SummaryIsNotTransition,
+    /// A summary was treated as the source document identity.
+    SummaryIsNotSourceIdentity,
+    /// A recovery slice was empty or length-mismatched.
+    InvalidEdgePayload,
+}
+
+impl fmt::Display for SummarizesEdgeError {
+    fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let message = match self {
+            Self::SummaryIsNotTransition => "a summary is not a state transition",
+            Self::SummaryIsNotSourceIdentity => "a summary is not the source document identity",
+            Self::InvalidEdgePayload => "invalid summarizes-edge payload",
+        };
+        formatter.write_str(message)
+    }
+}
+
+impl std::error::Error for SummarizesEdgeError {}
+
+#[cfg(test)]
+mod tests {
+    use super::SummarizesEdgeError;
+
+    #[test]
+    fn error_messages_are_stable() {
+        for (error, message) in [
+            (
+                SummarizesEdgeError::SummaryIsNotTransition,
+                "a summary is not a state transition",
+            ),
+            (
+                SummarizesEdgeError::SummaryIsNotSourceIdentity,
+                "a summary is not the source document identity",
+            ),
+            (
+                SummarizesEdgeError::InvalidEdgePayload,
+                "invalid summarizes-edge payload",
+            ),
+        ] {
+            assert_eq!(error.to_string(), message);
+        }
+    }
+}

crates/summarizes_edge/src/kind.rs

@@ -0,0 +1,130 @@
+//! Summary provenance versus the summarized source document.
+
+use crate::SummarizesEdgeError;
+
+/// Closed vocabulary of summary-related document identities.
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+pub enum SummarizesKind {
+    /// A summary of an earlier source (provenance; may point backward).
+    Summary,
+    /// The earlier source document being summarized.
+    SourceDocument,
+}
+
+impl SummarizesKind {
+    /// Return the stable wire kind name.
+    #[must_use]
+    pub const fn wire_name(self) -> &'static str {
+        match self {
+            Self::Summary => "summarizes",
+            Self::SourceDocument => "source_document",
+        }
+    }
+
+    /// Parse a stable wire kind name.
+    ///
+    /// # Errors
+    ///
+    /// Returns [`SummarizesEdgeError::InvalidEdgePayload`] for unrecognized
+    /// names.
+    pub fn from_wire_name(name: &str) -> Result<Self, SummarizesEdgeError> {
+        match name {
+            "summarizes" => Ok(Self::Summary),
+            "source_document" => Ok(Self::SourceDocument),
+            _ => Err(SummarizesEdgeError::InvalidEdgePayload),
+        }
+    }
+}
+
+/// Refuse to treat a summary as a forward state transition.
+///
+/// # Errors
+///
+/// Returns [`SummarizesEdgeError::SummaryIsNotTransition`] when `kind` is
+/// [`SummarizesKind::Summary`].
+pub fn refuse_summary_as_transition(kind: SummarizesKind) -> Result<(), SummarizesEdgeError> {
+    match kind {
+        SummarizesKind::Summary => Err(SummarizesEdgeError::SummaryIsNotTransition),
+        SummarizesKind::SourceDocument => Ok(()),
+    }
+}
+
+/// Refuse to treat a summary as the source document identity.
+///
+/// # Errors
+///
+/// Returns [`SummarizesEdgeError::SummaryIsNotSourceIdentity`] when `kind` is
+/// [`SummarizesKind::Summary`].
+pub fn refuse_summary_as_source_identity(kind: SummarizesKind) -> Result<(), SummarizesEdgeError> {
+    match kind {
+        SummarizesKind::Summary => Err(SummarizesEdgeError::SummaryIsNotSourceIdentity),
+        SummarizesKind::SourceDocument => Ok(()),
+    }
+}
+
+/// Fraction of recovered summary kinds that match known truth.
+///
+/// # Errors
+///
+/// Returns [`SummarizesEdgeError::InvalidEdgePayload`] when either slice is
+/// empty or the lengths differ.
+pub fn identity_recovery_rate(
+    truth: &[SummarizesKind],
+    decided: &[SummarizesKind],
+) -> Result<f64, SummarizesEdgeError> {
+    if truth.is_empty() || truth.len() != decided.len() {
+        return Err(SummarizesEdgeError::InvalidEdgePayload);
+    }
+    let mut matches = 0_u32;
+    for (truth_kind, decided_kind) in truth.iter().zip(decided) {
+        if truth_kind == decided_kind {
+            matches += 1;
+        }
+    }
+    Ok(f64::from(matches) / truth.len() as f64)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::{
+        SummarizesKind, identity_recovery_rate, refuse_summary_as_source_identity,
+        refuse_summary_as_transition,
+    };
+    use crate::SummarizesEdgeError;
+
+    #[test]
+    fn local_branches_cover_kinds_payloads_and_wire_names() {
+        assert_eq!(
+            refuse_summary_as_transition(SummarizesKind::Summary),
+            Err(SummarizesEdgeError::SummaryIsNotTransition)
+        );
+        assert_eq!(
+            refuse_summary_as_source_identity(SummarizesKind::Summary),
+            Err(SummarizesEdgeError::SummaryIsNotSourceIdentity)
+        );
+        refuse_summary_as_transition(SummarizesKind::SourceDocument).expect("source");
+        refuse_summary_as_source_identity(SummarizesKind::SourceDocument).expect("source");
+        for kind in [SummarizesKind::Summary, SummarizesKind::SourceDocument] {
+            assert_eq!(
+                SummarizesKind::from_wire_name(kind.wire_name()).expect("round-trip"),
+                kind
+            );
+        }
+        assert_eq!(
+            SummarizesKind::from_wire_name("references"),
+            Err(SummarizesEdgeError::InvalidEdgePayload)
+        );
+        let matched =
+            identity_recovery_rate(&[SummarizesKind::Summary], &[SummarizesKind::Summary])
+                .expect("rate");
+        assert!((matched - 1.0).abs() < f64::EPSILON);
+        assert_eq!(
+            identity_recovery_rate(&[], &[]),
+            Err(SummarizesEdgeError::InvalidEdgePayload)
+        );
+        assert_eq!(
+            identity_recovery_rate(&[SummarizesKind::Summary], &[]),
+            Err(SummarizesEdgeError::InvalidEdgePayload)
+        );
+    }
+}

crates/summarizes_edge/src/lib.rs

@@ -0,0 +1,22 @@
+#![forbid(unsafe_code)]
+#![deny(missing_docs)]
+#![allow(clippy::cast_precision_loss)]
+//! A summary is not a state transition and not the source document.
+//!
+//! Summary provenance may point to earlier event time. It never becomes an
+//! input-process-outcome edge and never reuses the source identity
+//! (ADR 0003).
+
+mod error;
+mod kind;
+
+/// Fail-closed summarizes-edge errors.
+pub use error::SummarizesEdgeError;
+/// Closed vocabulary of summary-related document identities.
+pub use kind::SummarizesKind;
+/// Fraction of recovered summary kinds that match known truth.
+pub use kind::identity_recovery_rate;
+/// Refuse to treat a summary as the source document identity.
+pub use kind::refuse_summary_as_source_identity;
+/// Refuse to treat a summary as a forward state transition.
+pub use kind::refuse_summary_as_transition;

crates/summarizes_edge/tests/crate_contract.rs

@@ -0,0 +1,7 @@
+//! Integration contract for the `summarizes_edge` package identity.
+
+#[test]
+fn package_identity_is_stable() {
+    let observed = std::hint::black_box(env!("CARGO_PKG_NAME"));
+    assert_eq!(observed, "summarizes_edge");
+}

crates/summarizes_edge/tests/summarizes_edge_contract.rs

@@ -0,0 +1,67 @@
+//! A summary is not a state transition and not the source document.
+
+use summarizes_edge::{
+    SummarizesEdgeError, SummarizesKind, identity_recovery_rate, refuse_summary_as_source_identity,
+    refuse_summary_as_transition,
+};
+
+#[test]
+fn a_summary_cannot_become_a_transition_or_the_source_identity() {
+    assert_eq!(
+        refuse_summary_as_transition(SummarizesKind::Summary),
+        Err(SummarizesEdgeError::SummaryIsNotTransition)
+    );
+    assert_eq!(
+        refuse_summary_as_source_identity(SummarizesKind::Summary),
+        Err(SummarizesEdgeError::SummaryIsNotSourceIdentity)
+    );
+    refuse_summary_as_transition(SummarizesKind::SourceDocument).expect("source");
+    refuse_summary_as_source_identity(SummarizesKind::SourceDocument).expect("source");
+}
+
+#[test]
+fn recovered_kinds_match_known_truth_better_than_a_source_collapse() {
+    let truth = [
+        SummarizesKind::Summary,
+        SummarizesKind::SourceDocument,
+        SummarizesKind::Summary,
+    ];
+    let recovered = truth;
+    let collapsed = [
+        SummarizesKind::SourceDocument,
+        SummarizesKind::SourceDocument,
+        SummarizesKind::SourceDocument,
+    ];
+    let recovered_rate = identity_recovery_rate(&truth, &recovered).expect("recovered");
+    let collapsed_rate = identity_recovery_rate(&truth, &collapsed).expect("collapsed");
+    let expected = {
+        let mut matches = 0_u32;
+        for (truth_kind, decided_kind) in truth.iter().zip(recovered.iter()) {
+            if truth_kind == decided_kind {
+                matches += 1;
+            }
+        }
+        f64::from(matches) / f64::from(u32::try_from(truth.len()).expect("len"))
+    };
+    assert!((recovered_rate - expected).abs() < f64::EPSILON);
+    assert!(recovered_rate > collapsed_rate);
+}
+
+#[test]
+fn empty_or_mismatched_kind_payloads_fail_closed() {
+    assert_eq!(
+        identity_recovery_rate(&[], &[]),
+        Err(SummarizesEdgeError::InvalidEdgePayload)
+    );
+    assert_eq!(
+        identity_recovery_rate(&[SummarizesKind::Summary], &[]),
+        Err(SummarizesEdgeError::InvalidEdgePayload)
+    );
+    assert_eq!(
+        identity_recovery_rate(
+            &[SummarizesKind::Summary, SummarizesKind::SourceDocument],
+            &[SummarizesKind::Summary]
+        ),
+        Err(SummarizesEdgeError::InvalidEdgePayload)
+    );
+}

docs/TRACEABILITY.md

@@ -12,7 +12,7 @@ The full APA 7th standards/literature register remains `docs/research/standards-
 | Rust workspace/quality foundation | ADR 0007 | workspace/CI/repository contract | implemented-main |
 | six distinct clocks and uncertain intervals | PRD; ADR 0002 | PR #8 `temporal_core` on protected main; `system_clock` system-vs-other-clock identity on the active PR | active-PR |
 | Allen relation algebra/bounded closure | ADR 0002; temporal research | PR #9 `temporal_core` path-consistency on protected main | implemented-main |
-| forward-only transition subgraph | PRD; ADR 0002/0003 | `relation_graph` on protected main; `outcome_order` IPO event-time order on the active PR | partial |
+| forward-only transition subgraph | PRD; ADR 0002/0003 | `relation_graph` on protected main; `summarizes_edge` summary-versus-source identity on the active PR | partial |
 | event ontology/evidence mentions | PRD; ADR 0003 | `event_core` mention/instance separation on protected main; `persistence_postgres` mention SQL implemented-main refuses mention-as-instance; event-instance SQL (#39 implemented-main) refuses inverted windows; full intelligence stack remaining | partial |
 | time-varying cross-classified multiple membership | PRD; ADR 0003 | `membership_core` network on protected main; `inferred_status` inferred-versus-observed identity on the active PR; multilevel estimators remaining | partial |
 | leakage-safe availability/cutoff snapshots | PRD; ADR 0002/0013 | `corpus_split` on protected main | implemented-main |

docs/adr/0003-relational-event-multiple-membership.md

@@ -1,6 +1,7 @@
 # ADR 0003 — Relational event ontology and time-varying multiple membership
 
 **Decision status:** Accepted  
+**Implementation maturity:** partial — membership network and event mention/instance separation implemented-main; summary-versus-source identity in `summarizes_edge` on the active PR; typed relation graph with forward-only transitions active-PR; multilevel estimators and persistence remain accepted-target  
 **Implementation maturity:** partial — membership network and event mention/instance separation implemented-main; typed relation graph with forward-only transitions implemented-main; IPO event-time order in `outcome_order` on the active PR; multilevel estimators and persistence remain accepted-target  
 **Implementation maturity:** partial — membership network and event mention/instance separation implemented-main; retrospective-reporting identity in `retrospective_edge` on the active PR; typed relation graph with forward-only transitions active-PR; multilevel estimators and persistence remain accepted-target  
 **Implementation maturity:** partial — membership network and event mention/instance separation implemented-main; inferred-versus-observed identity in `inferred_status` on the active PR; typed relation graph with forward-only transitions active-PR; multilevel estimators and persistence remain accepted-target  

docs/adr/README.md

@@ -12,6 +12,7 @@ Read [`ADR_POLICY.md`](ADR_POLICY.md) first. **Decision status and implementatio
 | [0002](0002-six-clock-temporal-semantics.md) | Six-clock temporal semantics and fail-closed historical leakage prevention | Accepted | partial | Typed clocks/intervals are implemented-main via `temporal_core`; retrospective-reporting identity is `retrospective_edge` on the active PR. Later graph/split enforcement remains target work. |
 | [0003](0003-relational-event-multiple-membership.md) | Relational event ontology and time-varying cross-classified multiple membership | Accepted | partial | Weighted time-varying membership network/roles are implemented-main (PR #12); retrospective-reporting identity is `retrospective_edge` on the active PR; full multilevel estimators and persistence remain accepted-target. ADR 0016 owns event-intelligence tasks. |
 | [0002](0002-six-clock-temporal-semantics.md) | Six-clock temporal semantics and fail-closed historical leakage prevention | Accepted | active-PR | Unmerged PR #8 is the canonical Task 3 replacement implementing typed clocks/intervals against the current protected-main lineage; conflicted PR #5 is superseded lineage. Later graph/split enforcement remains target work. |
+| [0003](0003-relational-event-multiple-membership.md) | Relational event ontology and time-varying cross-classified multiple membership | Accepted | partial | Weighted time-varying membership network/roles are implemented-main (PR #12); summary-versus-source identity is `summarizes_edge` on the active PR; full multilevel estimators and persistence remain accepted-target. ADR 0016 owns event-intelligence tasks. |
 | [0003](0003-relational-event-multiple-membership.md) | Relational event ontology and time-varying cross-classified multiple membership | Accepted | partial | Weighted time-varying membership network/roles are implemented-main (PR #12); inferred-versus-observed identity is `inferred_status` on the active PR; full multilevel estimators and persistence remain accepted-target. ADR 0016 owns event-intelligence tasks. |
 | [0002](0002-six-clock-temporal-semantics.md) | Six-clock temporal semantics and fail-closed historical leakage prevention | Accepted | active-PR | Evidential-vs-transition gate in `support_edge` on the active PR; remaining graph/split enforcement stays accepted-target. |
 | [0003](0003-relational-event-multiple-membership.md) | Relational event ontology and time-varying cross-classified multiple membership | Accepted | partial | Evidential-vs-transition identity in `support_edge` on the active PR; membership network/roles remain implemented-main; full multilevel estimators and persistence remain accepted-target. ADR 0016 owns event-intelligence tasks. |