diff --git a/docs/architecture/REPOSITORY-MAP.adoc b/docs/architecture/REPOSITORY-MAP.adoc
index d28ba7e..e2cc583 100644
--- a/docs/architecture/REPOSITORY-MAP.adoc
+++ b/docs/architecture/REPOSITORY-MAP.adoc
@@ -117,6 +117,10 @@ predecessors did.
 | yes
 | -
 
+| `applied-systems/`
+| yes
+| owner-requested reusable applications area (2026-11-07)
+
 | `benches/`
 | optional
 | Cargo-conventional at package root
@@ -204,6 +208,11 @@ your own repo - but do not read their emptiness as neglect here.
 | `.machine_readable/bot_directives/`
 | `.machine_readable/descriptiles/anchors/`
 | `.machine_readable/scripts/verification/`
+| `applied-systems/decision-science/`
+| `applied-systems/finance/`
+| `applied-systems/finance/cohort-economics/`
+| `applied-systems/finance/liquidity/`
+| `applied-systems/organisational-design/`
 | `docs/governance/audit/`
 | `docs/governance/audit/compliance/`
 | `docs/governance/audit/effects/`
diff --git a/docs/proposals/estate-mathematical-architecture.adoc b/docs/proposals/estate-mathematical-architecture.adoc
index c6b7ffa..57ed3a0 100644
--- a/docs/proposals/estate-mathematical-architecture.adoc
+++ b/docs/proposals/estate-mathematical-architecture.adoc
@@ -62,6 +62,59 @@ per-verb coaptation grades (`.machine_readable/coaptation/`), and the
 estate uses it for CRG, TRG, ARG and FRG. None of those is a PWG.
 ====
 
+[IMPORTANT]
+.Aeneas translations as a default learning route for ECHIDNA (owner direction 2026-11-09)
+====
+*Default.* First-party Rust that is verified with Creusot/Pearlite and
+Verus (PROOF-POLICY §1.2) is also translated with *Aeneas* (via Charon) into
+a Lean or Rocq model by default, starting with the security cores. A repo
+opts out by saying so in its proof-status file. The owner names the
+occasions where it does not apply.
+
+*Purpose.* The translations are a corpus for ECHIDNA, not proof evidence.
+Each translation pairs:
+
+* the Rust source;
+* its Creusot and Verus contracts;
+* the Aeneas model;
+* where one exists, the Agda theorem and its Rocq or Lean recheck.
+
+ECHIDNA learns from these pairs how statements correspond across systems.
+That is the groundwork for *mathematical-object arbitration*: deciding
+whether two artefacts in different systems state the same thing, which is
+the estate's equivalence-as-identity through-line. The corpus also exercises
+ECHIDNA's cross-prover exchange (OpenTheory, Dedukti) on real estate code.
+
+*What it does not change.*
+
+* *No proof status rises.* The theorem about an Aeneas model may be
+`PROVEN`. The correspondence between the model and the Rust (Aeneas's
+translation) is a separate `ASSUMED` row (PROOF-POLICY §4.1). A Creusot or
+Verus result on the code itself is still what establishes implementation
+correctness.
+* *Backend axioms.* Aeneas's Rocq backend carries an axiom from which
+`False` is derivable (its `mk_array` axiom, Aeneas issue #1116). Its Lean
+backend depends on Mathlib, which §2 rules out for theory rechecks. Neither
+backend's output may stand as a theory witness or count toward a PWG.
+Corpus use is unaffected, because nothing in the corpus is counted.
+* *Evidence stays home.* Each translation and its receipt live in the home
+repository. Mathesis catalogues them as correspondence records, not as
+receipts of proof.
+
+*Policy gap.* PROOF-POLICY §4.1 currently allows Aeneas "only where Rust
+code implements a theorem proved in Agda". Making it a default, even for
+corpus use, needs an amendment in `metadatastician/standards`. File it
+together with the ATS2 amendment (also owner direction 2026-11-09). Until
+then, translations outside §4.1's scope are corpus artefacts only and are
+recorded as such.
+
+*Related direction (design open).* Mathesis becomes the shared, canonical
+centre for this record. Each participating repository keeps a local copy
+that is attested by its deed and kept in line by k9 and coordination
+runners. Any drift from, or attempt to change, the canonical record raises
+an alert. Fable's restart session sets the mechanism.
+====
+
 == Original working brief (preserved)
 
 [literal]
diff --git a/mathesis_chora.deed b/mathesis_chora.deed
index 5b1c733..ddb2e29 100644
--- a/mathesis_chora.deed
+++ b/mathesis_chora.deed
@@ -30,9 +30,9 @@
   ; equal canon.lock [canon.artifacts]; canon.lock [canon.lockstep].order is
   ; spine-adopts-then-canon-releases, so this clause moves FIRST.
   (canon
-    :version "2.1.3"
+    :version "2.1.5"
     :criteria-sha256 "6a5aa8857bd0d0d58ef48827938ca17c251b6b854dacf59d306388d61694d82a"
-    :gates-sha256 "2f31f46d4753432e0aa8c9c28f339e18e062c98dc6e6ef4ecbb76993cf37638b"
+    :gates-sha256 "5c510bba025be718deebb12d0333bfe7db2da43c66578b728b1a334df65290b1"
     :lockstep-since "2026-09-17"
     ; A canon change this repo cannot satisfy is a change made in the WRONG
     ; ORDER, not a rejected change: land the spine's adoption first, then the