diff --git a/crates/ogar-vocab/src/lib.rs b/crates/ogar-vocab/src/lib.rs
index f706a37..285a85c 100644
--- a/crates/ogar-vocab/src/lib.rs
+++ b/crates/ogar-vocab/src/lib.rs
@@ -1526,13 +1526,38 @@ pub enum ConceptDomain {
     /// transcribing a GPL/AGPL implementation, so this public codebook stays
     /// unencumbered while GPL consumers link it freely.
     Blocks,
-    /// `0xC0XX` — **Java runtime** (Project Panama + Project Valhalla): the
-    /// managed-runtime membrane over the SoA substrate. The **floor of the
-    /// C-band** — the door every other tenant of that layer arrives through.
-    /// Carries ZERO vocabulary rows today — same reserved posture as
-    /// [`Osint`](Self::Osint) / [`Genetics`](Self::Genetics) /
-    /// [`Blocks`](Self::Blocks): the slot returns a stable domain tag before
-    /// any concept mints (operator ruling, 2026-08-18).
+    /// `0xC0XX` — **Java runtime (Panama FFM)**: the managed-runtime
+    /// membrane over the SoA substrate via Project Panama's Foreign
+    /// Function & Memory API — downcalls, memory segments, lanes, arenas,
+    /// masks. The **floor of the C-band** — the door every other tenant of
+    /// that layer arrives through. Carries ZERO vocabulary rows today —
+    /// same reserved posture as [`Osint`](Self::Osint) /
+    /// [`Genetics`](Self::Genetics) / [`Blocks`](Self::Blocks): the slot
+    /// returns a stable domain tag before any concept mints (operator
+    /// ruling, 2026-08-18).
+    ///
+    /// **Valhalla deliberately has NO domain representation here — and NOT
+    /// because it is unintegrated** (cross-session ruling, 2026-08-18,
+    /// `lance-graph-java` × `ruff`/R2IL: *"a `ConceptDomain` is a
+    /// vocabulary of ADDRESSABLE things; Panama's crossing concepts —
+    /// downcalls, segments, lanes, arenas, masks — are addressable, while
+    /// Valhalla flatness is a property of a representation. If it ever
+    /// needs surfacing, it's a facet on an existing concept, not a
+    /// domain."*). Valhalla IS integrated in `lance-graph-java`, in two
+    /// real senses: the shipping descriptor vocabulary (`LaneId` /
+    /// `Ordinal` / `MaskId` / `RowRange` / `FacetId`) is designed so the
+    /// same source compiles as `value record` under JEP 401 — migration is
+    /// one word per type — and a real Valhalla EA build (`27-jep401ea3`)
+    /// ran the A/B with measured results (array flattening cliff at 8-byte
+    /// payload; 4–8-byte descriptors 5.5× smaller / up to 8.3× faster
+    /// where flattening applies; bulk data stays native, winning 38–57×
+    /// on both platforms). Precisely BECAUSE that integration is a
+    /// designed property OF the `0xC0` concepts' vocabulary rather than a
+    /// concept itself, it mints no address: properties of concepts do not
+    /// get domains. This corrects the prior doc text here, which bundled
+    /// the two as "Panama + Valhalla" as if both named crossing surfaces.
+    /// A genuine Valhalla concept, if one is ever needed, is argued fresh
+    /// on its own merits — it does not inherit squatting rights in `0xC0`.
     ///
     /// First named consumer: `lance-graph-java`'s planned schema/classid
     /// field on `LgjResourceInfo` / `LgjLaneDesc`, by which a native
diff --git a/docs/APP-CLASS-CODEBOOK-LAYOUT.md b/docs/APP-CLASS-CODEBOOK-LAYOUT.md
index 71eb88e..2988753 100644
--- a/docs/APP-CLASS-CODEBOOK-LAYOUT.md
+++ b/docs/APP-CLASS-CODEBOOK-LAYOUT.md
@@ -68,7 +68,7 @@ classid : u32  =  [ hi u16 : in-codebook class ]  [ lo u16 : APP / codebook name
 
   | slot | domain | why there |
   |---|---|---|
-  | `0xC0` | `JavaRuntime` (Panama + Valhalla) | the managed-runtime membrane over the SoA substrate — the **floor** of the band |
+  | `0xC0` | `JavaRuntime` (Panama FFM) | the managed-runtime membrane over the SoA substrate — the **floor** of the band. Valhalla deliberately has NO domain slot — not because it is unintegrated (lance-graph-java's shipping descriptor vocabulary is `value record`-ready by design, one word per type, with measured EA-build numbers) but because it is a representation *property of* the C0 concepts' vocabulary, never an addressable boundary itself — see the `JavaRuntime` doc comment in `ogar-vocab` |
   | `0xC1` | `Analytics` | the analyst estate — addressable tabular units + catalog ontology (`ogar-bricks` and a lakehouse consumer are two app prefixes over ONE vocabulary) |
   | `0xC4` | `BinaryLifting` | bolted onto `0xC0` (Ghidra is itself a JVM application), so a **tenant** of that layer rather than a peer; the slot number is the blast radius |
 
diff --git a/docs/DISCOVERY-MAP.md b/docs/DISCOVERY-MAP.md
index 43a2b85..683f34c 100644
--- a/docs/DISCOVERY-MAP.md
+++ b/docs/DISCOVERY-MAP.md
@@ -1687,6 +1687,18 @@ isolation. The map's job is to keep them visible.
   stratum. Cross-ref: that repo's `.claude/board/EPIPHANIES.md`
   `E-LGJ-THE-DOMAIN-BYTE-CARRIES-ALTITUDE-1`.
 
+  **Correction (2026-08-18, same day, cross-session ruling lance-graph-java ×
+  ruff/R2IL):** the parenthetical above reads "(Panama + Valhalla)" — the slot
+  is **Panama FFM alone**. Valhalla gets no domain representation: a
+  `ConceptDomain` is a vocabulary of ADDRESSABLE things, and Valhalla is a
+  representation property (flatness) OF the C0 vocabulary, not a crossing
+  concept. Stated precisely so the ruling is not misread as "Valhalla is
+  unintegrated": lance-graph-java's shipping descriptor types are
+  `value record`-ready by design (one-word migration under JEP 401) and the
+  A/B ran on a real EA build with measured numbers — the integration is a
+  designed property of the concepts, which is exactly why it mints no
+  address. Canonical text: the `JavaRuntime` doc comment in `ogar-vocab`.
+
 - **[D-BLOCKS-DOMAIN] `0x17XX` reserved as ConceptDomain::Blocks — the shared
   visual block-programming opcode vocabulary, ONE canon domain under two app
   prefixes** — `[G]` (CODED, reserved-empty, 2026-08-04, operator-chosen slot)