D-EPI-COT C3 (land #1841 on main): grounded, Epi5-eligible tactic warrant

.claude/board/entries/2026-10-28-d-epi-cot-c3-warrant.md

@@ -0,0 +1,42 @@
+# D-EPI-COT-C3 (first slice): tactics run only on grounded, Epi5-eligible markers
+
+**Status:** TEST-PINNED. Code:
+- `crates/lance-graph-planner/src/nars/warrant.rs`
+- `epistemic_state5::RecipeRule`
+- `certification::CertificationModel::measured_only`
+
+Plan: `docs/research/epistemic-cot/c3-plan.md` §8.
+
+## Decision
+
+- **SCOPE:** a planner tactic (RCR 4, TR 6, CAS 8) runs only on `Marker`s. A marker is three things together:
+  - the ledger's pooled truth and roots;
+  - bits 59..63 projected through `Epi5Declarations`;
+  - a thought slot and generation.
+
+  Each premise must satisfy the recipe's `RecipeRule`. The rule's requires/forbids are policy pins: Associated for 4/6/7/8, and no intermediate-known for RCR.
+- **Judgments** carry the tactic's truth, the proof's roots, the thought, and `Unknown × Open`. A term-logic step earns no certification. The only promotion is `pearl::reason` + `revise` over executed trial arms (pinned in the same test).
+- **`measured_only`:** an unmeasured outcome is excluded, not read as negative. That includes trial arms, which `causes` reads without the universe.
+
+## Evidence
+
+- 9 new tests. 9 disables, each red.
+- One disable (trial arms unrestricted) was green on the first fixture: every control unit was measured. An unmeasured-control fixture was added before recording.
+- Planner lib 485 pass; contract lib 1561 pass.
+- Clippy `--lib --tests` reports the same 8 sites as main `694b243bd`.
+
+## Open
+
+- Effect size, sample size, uncertainty and multiple comparisons are still unreported by `CertificationModel`.
+- Missing-at-random is assumed.
+- ASC and CR are not run through `fire`.
+- The lab affordance law still has its own rule type.
+- C3b and C3c wait on the bits 50..52 order decision and the TFLite location.
+
+## Addendum, same day: ledger → `pearl::hydrate`
+
+- `nars::mediator::hydrate_from_ledger` connects the ledger's grounded deductions of `A → Y` through `B` to the unchanged `pearl::hydrate`. It returns derivations, roots, the `Hydration` result, the edge and the mediated-path sensitivity.
+- The ledger never creates a chain, and a path the chain does not witness leaves the edge unchanged. A chain-only path has no ledger receipt and is refused.
+- `Law::Deduction` admits `Impl` in an explicit step: never closure, and `Rel` never composes.
+- 5 tests; 5 disables red. The first grounding disable did not bind (no proofs exist without evidence); it was replaced before recording.
+- Maturation order for new declared readings is `7 = Staunen … 0 = Wisdom`. The TFLite kernels are in ndarray.

.claude/board/entries/README.md

@@ -25,14 +25,15 @@ index row, (3) no duplicate entry id. Checks 1 and 2 are deliberately
 opposite directions; the stranding this convention prevents shows up in
 exactly one of them, never both.
 
-498 entries, 2026-08-06 .. 2026-10-28.
+499 entries, 2026-08-06 .. 2026-10-28.
 
 | date | entry id | finding | file |
 |---|---|---|---|
 | 2026-10-28 | `thought-layers-nan-skip` |  | [2026-10-28-thought-layers-nan-skip.md](2026-10-28-thought-layers-nan-skip.md) |
 | 2026-10-28 | `lane-layout-from-classview` |  | [2026-10-28-lane-layout-from-classview.md](2026-10-28-lane-layout-from-classview.md) |
 | 2026-10-28 | `D-SAG-6-1` |  | [2026-10-28-d-sag-6-1-audit-reference-ledger.md](2026-10-28-d-sag-6-1-audit-reference-ledger.md) |
 | 2026-10-28 | `D-EPI-COT-C3B` |  | [2026-10-28-d-epi-cot-c3b-scent.md](2026-10-28-d-epi-cot-c3b-scent.md) |
+| 2026-10-28 | `D-EPI-COT-C3` |  | [2026-10-28-d-epi-cot-c3-warrant.md](2026-10-28-d-epi-cot-c3-warrant.md) |
 | 2026-10-28 | `D-EPI-COT` |  | [2026-10-28-d-epi-cot-c0-c2.md](2026-10-28-d-epi-cot-c0-c2.md) |
 | 2026-10-28 | `D-DT64-6` |  | [2026-10-28-d-dt64-6-routing-bindstore-behavior.md](2026-10-28-d-dt64-6-routing-bindstore-behavior.md) |
 | 2026-10-28 | `D-DT64-6-1a` |  | [2026-10-28-d-dt64-6-ogit-predicates-impl.md](2026-10-28-d-dt64-6-ogit-predicates-impl.md) |

crates/lance-graph-contract/src/certification.rs

@@ -289,6 +289,35 @@ impl<M: PopulationMask> CertificationModel<M> {
         )
     }
 
+    /// The model restricted to the units whose outcome was measured.
+    ///
+    /// `outcome` is a positive mask: a unit outside it reads as a known
+    /// negative. A unit whose outcome is UNKNOWN must not read that way, so
+    /// before certifying, every mask (population, strata, ordering,
+    /// robustness, and the trial arms, which `causes` reads without the
+    /// universe) is intersected with `measured`. An arm left with no measured
+    /// unit refuses as [`NotGrounded::EmptyArm`] rather than deciding.
+    #[must_use]
+    pub fn measured_only(&self, measured: &M) -> Self {
+        let keep = |m: &M| m.intersection(measured);
+        CertificationModel {
+            universe: keep(&self.universe),
+            exposed: keep(&self.exposed),
+            outcome: keep(&self.outcome),
+            strata: [
+                keep(&self.strata[0]),
+                keep(&self.strata[1]),
+                keep(&self.strata[2]),
+                keep(&self.strata[3]),
+            ],
+            ordered: keep(&self.ordered),
+            clean: keep(&self.clean),
+            trial: keep(&self.trial),
+            assigned: keep(&self.assigned),
+            ..self.clone()
+        }
+    }
+
     /// The randomized arms read as a population of their own.
     pub fn trial_view(&self) -> CertificationModel<M> {
         CertificationModel {
@@ -458,6 +487,58 @@ impl<M: PopulationMask> ModelBuilder<M> {
 mod tests {
     use super::*;
 
+    /// Unmeasured outcomes are not negatives. Treated arm: 4 units with the
+    /// outcome, 4 whose outcome was never measured. Control arm: 3 of 8.
+    /// Reading the unmeasured units as negatives gives 4/8 against 3/8, so
+    /// `causes` holds; restricted to measured units it is 4/4 against 3/8.
+    /// The second fixture moves the gap the other way: 2 of 8 treated
+    /// measured positive, 6 unmeasured; as negatives 2/8 < 3/8 refutes, as
+    /// unknown 2/2 > 3/8 holds.
+    #[test]
+    fn unmeasured_outcomes_are_not_read_as_negatives() {
+        let build = |treated_hits: u32, treated_unknown: u32| {
+            let mut b = ModelBuilder::new();
+            b.sources(SupportBasis::InterventionBacked, &[1, 2]);
+            let (t_known, _) = b.arm(true, treated_hits, treated_hits);
+            let (t_unknown, _) = b.arm(true, treated_unknown, 0);
+            let (c, _) = b.arm(false, 8, 3);
+            let measured = t_known.union(&c);
+            assert!(!t_unknown.is_empty() && !t_unknown.intersects(&measured));
+            (b.build(), measured)
+        };
+
+        let (m, measured) = build(2, 6);
+        assert_eq!(m.causes(), Ok(false), "unknowns read as negatives refute");
+        assert_eq!(m.measured_only(&measured).causes(), Ok(true));
+
+        let (m, measured) = build(4, 4);
+        assert_eq!(m.causes(), Ok(true));
+        assert_eq!(m.measured_only(&measured).causes(), Ok(true));
+
+        // Unknowns in the control arm: treated 1 of 4 measured, control 3 of
+        // 8 measured plus 8 unmeasured. Read as negatives the control rate
+        // is 3/16 and treated (1/4) looks higher; restricted it is 3/8 and
+        // treated is lower.
+        let mut b = ModelBuilder::new();
+        b.sources(SupportBasis::InterventionBacked, &[1, 2]);
+        let (t, _) = b.arm(true, 4, 1);
+        let (c_known, _) = b.arm(false, 8, 3);
+        let (c_unknown, _) = b.arm(false, 8, 0);
+        let m = b.build();
+        let measured = t.union(&c_known);
+        assert!(!c_unknown.intersects(&measured));
+        assert_eq!(m.causes(), Ok(true), "unknown controls read as negatives");
+        assert_eq!(m.measured_only(&measured).causes(), Ok(false));
+
+        // An arm with no measured unit refuses instead of deciding.
+        let (m, _) = build(2, 6);
+        let control_only = m.trial.difference(&m.assigned);
+        assert_eq!(
+            m.measured_only(&control_only).causes(),
+            Err(NotGrounded::EmptyArm)
+        );
+    }
+
     /// Every fold of a model, so two models can be compared fold by fold.
     fn folds<M: PopulationMask>(m: &CertificationModel<M>) -> [Sat; 6] {
         [

crates/lance-graph-contract/src/epistemic_state5.rs

@@ -306,6 +306,59 @@ pub const fn facts_population(required: Facts) -> Population {
     population
 }
 
+/// A recipe's epistemic obligations: the facts a state must assert
+/// (`requires`) and must not assert (`forbids`) for the recipe to be eligible
+/// on an edge in that state.
+///
+/// This is the affordance law's rule, moved from the D-GSO-AFF-0 lab
+/// (`cognitive-shader-driver/examples/shared/affordance_law.rs`) so a
+/// production consumer can read it. Eligibility is a read-only derivation from
+/// declared facts: it does not authorize execution, does not say a
+/// conclusion is true, and never writes an edge.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Default)]
+pub struct RecipeRule {
+    /// Facts every eligible state asserts.
+    pub requires: Facts,
+    /// Facts no eligible state asserts.
+    pub forbids: Facts,
+}
+
+impl RecipeRule {
+    /// A rule with these obligations.
+    #[must_use]
+    pub const fn new(requires: Facts, forbids: Facts) -> Self {
+        Self { requires, forbids }
+    }
+
+    /// Whether a state asserting `facts` satisfies the rule.
+    #[must_use]
+    pub const fn holds(self, facts: Facts) -> bool {
+        facts & self.requires == self.requires && facts & self.forbids == 0
+    }
+
+    /// Whether `state` satisfies the rule.
+    #[must_use]
+    pub const fn admits(self, state: EpistemicState5) -> bool {
+        self.holds(state.facts())
+    }
+
+    /// The V1 codes on which the rule holds. Reserved codes never appear.
+    #[must_use]
+    pub const fn population(self) -> Population {
+        let mut population = 0;
+        let mut raw = 0;
+        while raw < CODES {
+            if let Some(facts) = COMPILED_FACTS_V1[raw] {
+                if self.holds(facts) {
+                    population |= 1 << raw;
+                }
+            }
+            raw += 1;
+        }
+        population
+    }
+}
+
 /// A reading generation. V1 is the 2 × 3 product above.
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Default)]
 pub enum Epi5Gen {
@@ -540,6 +593,39 @@ mod tests {
         EpistemicState5::new(Epi5Gen::V1, t, c).raw()
     }
 
+    /// A rule's population is exactly the meaningful codes it admits, and
+    /// `forbids` removes codes `requires` alone would keep.
+    #[test]
+    fn a_recipe_rule_population_matches_its_per_state_check() {
+        let rule = RecipeRule::new(ASSOCIATED, INTERMEDIATE_KNOWN);
+        let mut expected = 0;
+        for raw in 0u8..32 {
+            if let Ok(s) = EpistemicState5::decode(Epi5Gen::V1, raw) {
+                if rule.admits(s) {
+                    expected |= 1 << raw;
+                }
+            }
+        }
+        assert_eq!(rule.population(), expected);
+        assert_eq!(
+            RecipeRule::new(ASSOCIATED, 0).population() & !rule.population(),
+            facts_population(ASSOCIATED | INTERMEDIATE_KNOWN),
+            "forbids removes exactly the states that assert the forbidden fact"
+        );
+        assert!(!rule.admits(EpistemicState5::new(
+            Epi5Gen::V1,
+            T::IndirectKnown,
+            C::Causes
+        )));
+        assert!(rule.admits(EpistemicState5::new(
+            Epi5Gen::V1,
+            T::IndirectUnknown,
+            C::Causes
+        )));
+        assert!(!rule.admits(EpistemicState5::new(Epi5Gen::V1, T::Direct, C::Open)));
+        assert_eq!(rule.population() >> 24, 0, "reserved codes never admitted");
+    }
+
     /// The layout is the product: `raw5 = t | c << 2`, 24 meaningful, 8
     /// reserved, and decode inverts it on every code.
     #[test]