diff --git a/docs/design/node-presentation.md b/docs/design/node-presentation.md
new file mode 100644
index 0000000..c7d9f83
--- /dev/null
+++ b/docs/design/node-presentation.md
@@ -0,0 +1,57 @@
+# BV node presentation architecture
+
+This document is the authoritative contract for BV node and widget presentation.
+The machine-readable exception registry is `PRESENTATION_EXCEPTIONS` in
+`ui/src/regional/nodePresentation.ts`.
+
+## Non-negotiable rules
+
+1. Every new BV UI surface uses the shared BV UI pack and its tokens/components.
+2. Every manipulation of a ComfyUI node, port or widget is implemented in the
+   central presentation/manipulation modules.
+3. Feature modules may own domain state and structural graph behavior. They must
+   delegate hiding, projection, ordering, measurement, compaction and resizing.
+4. Classic, Node Library Ghost and Nodes 2.0 consume the same semantic policy.
+5. A connected Legacy port stays visible even when Legacy Debug is disabled.
+6. Internal state and provider plumbing remain serialized and executable while
+   their visual representation is hidden.
+7. User-controlled dimensions are never overwritten by an automatic refresh.
+8. Direct `converted-widget`, `hidden`, `computeSize`, `setSize`, DOM projection
+   or slot-visibility code outside the central modules requires a registered
+   exception before it is merged.
+
+## Central modules
+
+| Module | Responsibility |
+| --- | --- |
+| `ui/src/regional/nodePresentation.ts` | Semantic roles, node policies and exception registry |
+| `ui/src/regional/classicNodePresentation.ts` | Classic adapter and measured layout |
+| `ui/src/regional/nodes2NodePresentation.ts` | Nodes 2.0 DOM adapter |
+| `ui/src/regional/nodePreviewProjection.ts` | Node Library Ghost adapter |
+| `ui/src/regional/portProjection.ts` | Runtime provider-port projection and connection-aware layout |
+
+Node-specific code may request these operations. It must not reimplement them.
+
+## Registered exceptions
+
+The current exceptions, their exact implementation paths, rationale and intended
+centralization path live in `PRESENTATION_EXCEPTIONS`. This keeps the list next
+to the policy used at runtime and prevents documentation from silently diverging.
+
+An exception is legitimate only when it adapts a genuinely different ComfyUI
+lifecycle seam, such as promoted Subgraph proxy widgets or runtime-generated
+graph slots. A node being visually unusual is not sufficient justification.
+
+## Adding or changing UI behavior
+
+Before implementation:
+
+1. Add or extend the semantic role/policy centrally.
+2. Extend the applicable Classic, Ghost and Nodes 2.0 adapter tests.
+3. Use BV UI pack components and tokens for rendered controls.
+4. If a central interface cannot represent the requirement, deepen that module.
+5. Only if the lifecycle seam genuinely differs, register an exception with its
+   file path, reason and concrete future centralization path.
+
+No presentation task is complete until implementation, automated coverage,
+visual acceptance and this architecture contract agree.
diff --git a/js/bv_pipe_shared.js b/js/bv_pipe_shared.js
index c8d9f5a..155b4ee 100644
--- a/js/bv_pipe_shared.js
+++ b/js/bv_pipe_shared.js
@@ -1,4 +1,6 @@
 // bv_pipe_shared.js
+// Registered presentation exception: dynamic-pipe-slot-structure.
+// See PRESENTATION_EXCEPTIONS in ui/src/regional/nodePresentation.ts.
 import { app } from "../../scripts/app.js";
 
 export const MAX_SLOTS = 100;
diff --git a/js/bv_prompt_debug.js b/js/bv_prompt_debug.js
index 36a4fa7..1b34820 100644
--- a/js/bv_prompt_debug.js
+++ b/js/bv_prompt_debug.js
@@ -1,3 +1,5 @@
+// Registered presentation exception: execution-result-preview-widgets.
+// See PRESENTATION_EXCEPTIONS in ui/src/regional/nodePresentation.ts.
 import { app } from "../../scripts/app.js";
 import { ComfyWidgets } from "../../scripts/widgets.js";
 
diff --git a/js/bv_seed.js b/js/bv_seed.js
index 21ab9e3..be67f59 100644
--- a/js/bv_seed.js
+++ b/js/bv_seed.js
@@ -1,3 +1,5 @@
+// Registered presentation exception: seed-action-projection.
+// See PRESENTATION_EXCEPTIONS in ui/src/regional/nodePresentation.ts.
 import { app } from "../../scripts/app.js";
 import { applySeedAction, materializeSeedControl } from "./bv_seed_model.js";
 
diff --git a/js/bv_smart_pipe.js b/js/bv_smart_pipe.js
index bc5fa64..a9ca999 100644
--- a/js/bv_smart_pipe.js
+++ b/js/bv_smart_pipe.js
@@ -1,3 +1,5 @@
+// Registered presentation exception: dynamic-pipe-slot-structure.
+// See PRESENTATION_EXCEPTIONS in ui/src/regional/nodePresentation.ts.
 import { app } from "../../scripts/app.js";
 import { moveMarkedPortToEnd, nextFreeOrdinal, promoteConnectedInheritedSlots, promoteInheritedSlot, resolveLocalSlotNameCollisions, retainedMissingSlots, reusableSmartPipePortIndex, smartPipeSlotName, uniqueSmartPipeSlotName, updateSmartPipePort } from "./bv_smart_pipe_slots.js";
 import { mergePipeSchemas, SMART_PIPE_DEFAULT_TITLE } from "./bv_smart_pipe_merge_model.js";
diff --git a/js/bv_smart_pipe_merge.js b/js/bv_smart_pipe_merge.js
index 05c6b17..cc622a0 100644
--- a/js/bv_smart_pipe_merge.js
+++ b/js/bv_smart_pipe_merge.js
@@ -1,3 +1,5 @@
+// Registered presentation exception: dynamic-pipe-slot-structure.
+// See PRESENTATION_EXCEPTIONS in ui/src/regional/nodePresentation.ts.
 import { app } from "../../scripts/app.js";
 import { activeDescriptorFor, collectExpandedPipeAddresses, propagate } from "./bv_smart_pipe.js";
 import {
diff --git a/js/bv_subgraph_ui_projection.js b/js/bv_subgraph_ui_projection.js
index 3100f92..e8f6de1 100644
--- a/js/bv_subgraph_ui_projection.js
+++ b/js/bv_subgraph_ui_projection.js
@@ -1,3 +1,5 @@
+// Registered presentation exception: subgraph-promoted-widget-proxies.
+// See PRESENTATION_EXCEPTIONS in ui/src/regional/nodePresentation.ts.
 const PRESENTATION_TYPES = new Set(["BV_HEADING", "BV_SPACER", "BV_DIVIDER"]);
 import { normalizeDynamicComboSelection } from "./bv_dynamic_combo_model.js";
 const PRESENTATION_NODE_TYPES = new Map([
diff --git a/ui/src/components/control/bv_control_center.ts b/ui/src/components/control/bv_control_center.ts
index e3900ed..306de52 100644
--- a/ui/src/components/control/bv_control_center.ts
+++ b/ui/src/components/control/bv_control_center.ts
@@ -1,3 +1,5 @@
+// Registered presentation exception: control-center-dynamic-widgets.
+// See PRESENTATION_EXCEPTIONS in regional/nodePresentation.ts for rationale and exit path.
 import { getApp } from "../../appHelper.js";
 import { collectAllGroups, collectNodesByType, nodeMatchesType } from "../../util/control/collector";
 import { BVControlConfig, CONFIG_CHANGED_EVENT, readConfig, writeConfig } from "../../util/control/configHandler";
diff --git a/ui/src/regional/m0ResourceSpike.tsx b/ui/src/regional/m0ResourceSpike.tsx
index 3639a17..0e62915 100644
--- a/ui/src/regional/m0ResourceSpike.tsx
+++ b/ui/src/regional/m0ResourceSpike.tsx
@@ -1,3 +1,5 @@
+// Registered presentation exception: m0-runtime-resource-projection.
+// See PRESENTATION_EXCEPTIONS in nodePresentation.ts for rationale and exit path.
 import React from "react";
 import ReactDOM from "react-dom/client";
 import { getApi, getApp } from "../appHelper.js";
diff --git a/ui/src/regional/nodePresentation.ts b/ui/src/regional/nodePresentation.ts
index f5d4bd2..0079ab2 100644
--- a/ui/src/regional/nodePresentation.ts
+++ b/ui/src/regional/nodePresentation.ts
@@ -1,6 +1,70 @@
 export type PresentationSurface="classic"|"ghost"|"nodes2";
 export type PresentationRole="public"|"legacy"|"internalState"|"provider"|"dynamicReserve";
 
+/**
+ * Central contract for every BV node/widget presentation mutation.
+ *
+ * New UI must use the shared BV UI pack. New code must not hide, resize,
+ * replace, reorder or project ComfyUI nodes/widgets directly outside the
+ * central presentation modules. The entries below document the pre-existing
+ * adapters that still have to touch a ComfyUI-specific lifecycle seam. They
+ * are exceptions to be retired or absorbed here, not examples to copy.
+ *
+ * Full invariants, ownership rules and adapter rationale:
+ * docs/design/node-presentation.md
+ */
+export type PresentationException=Readonly<{
+    id:string;
+    implementation:readonly string[];
+    reason:string;
+    centralizationPath:string;
+}>;
+
+export const PRESENTATION_EXCEPTIONS:readonly PresentationException[]=[
+    {
+        id:"regional-prompt-bootstrap-measurement",
+        implementation:["ui/src/regional/portProjection.ts#installRegionalPromptCreationLayout"],
+        reason:"ComfyUI measures the backend definition before the Regional Prompt instance has its projected provider markers and action widgets.",
+        centralizationPath:"Keep this lifecycle adapter until the central presentation inventory can run before the first ComfyUI measurement.",
+    },
+    {
+        id:"m0-runtime-resource-projection",
+        implementation:["ui/src/regional/m0ResourceSpike.tsx"],
+        reason:"The M0 collector and consumers create graph-bound provider slots and DOM pickers dynamically, before the normal policy inventory is complete.",
+        centralizationPath:"Move its local widget hiding and slot flags behind central widget/port projection helpers before extending M0.",
+    },
+    {
+        id:"control-center-dynamic-widgets",
+        implementation:["ui/src/components/control/bv_control_center.ts"],
+        reason:"Control toggles and the conflict-status row are generated from runtime configuration and must be reconciled in a stable order.",
+        centralizationPath:"Keep dynamic widget creation local; move all hiding, sizing and ordering primitives into the central manipulation library.",
+    },
+    {
+        id:"subgraph-promoted-widget-proxies",
+        implementation:["js/bv_subgraph_ui_projection.js","js/bv_subgraph_nodes2_projection.js","js/bv_subgraph_layout.js"],
+        reason:"Promoted Subgraph widgets are ComfyUI-owned proxy objects that are recreated asynchronously and differ between Classic and Nodes 2.0.",
+        centralizationPath:"Keep the lifecycle adapter separate, but route shared visibility and sizing decisions through this module and the presentation bridge.",
+    },
+    {
+        id:"dynamic-pipe-slot-structure",
+        implementation:["js/bv_pipe_shared.js","js/bv_smart_pipe.js","js/bv_smart_pipe_merge.js"],
+        reason:"Pipe nodes add, remove and relabel structural graph slots from their runtime schema; this is domain behavior, not merely visual projection.",
+        centralizationPath:"Structural slot ownership remains local; every visual hide, compact or resize operation must use the central presentation bridge.",
+    },
+    {
+        id:"seed-action-projection",
+        implementation:["js/bv_seed.js"],
+        reason:"Seed actions are semantic controls that also project through promoted Subgraph widgets and therefore require a source/host adapter.",
+        centralizationPath:"Keep seed state transitions local and route widget construction, sizing and host projection through shared presentation primitives.",
+    },
+    {
+        id:"execution-result-preview-widgets",
+        implementation:["js/bv_prompt_debug.js"],
+        reason:"Prompt AST Debug and Text Log Writer expose read-only multiline content populated only by execution callbacks.",
+        centralizationPath:"Keep execution data handling local; create and style preview widgets exclusively through the shared BV UI/presentation helpers.",
+    },
+] as const;
+
 export type PresentationPort=Readonly<{
     direction:"input"|"output";
     name:string;
diff --git a/ui/src/regional/portProjection.ts b/ui/src/regional/portProjection.ts
index b2d3a8a..a457bd8 100644
--- a/ui/src/regional/portProjection.ts
+++ b/ui/src/regional/portProjection.ts
@@ -16,6 +16,8 @@ export function markProjectedProvider(slot:any){if(!slot)return;slot.hidden=true
 
 export function suppressInitialProjectedProviderDefinitions(nodeData:any){const optional=nodeData?.input?.optional;if(!optional)return[];const removed:string[]=[];for(const [name,spec]of Object.entries(optional)){if(PROVIDERS.has(String((spec as any)?.[0]??""))){delete optional[name];removed.push(name)}}return removed}
 
+// Registered presentation exception: regional-prompt-bootstrap-measurement.
+// See PRESENTATION_EXCEPTIONS in nodePresentation.ts for rationale and exit path.
 export function installRegionalPromptCreationLayout(nodeType:any){const prototype=nodeType?.prototype,original=prototype?.computeSize;if(!prototype||typeof original!=="function"||prototype.__bvRegionalPromptCreationLayout)return;prototype.__bvRegionalPromptCreationLayout=true;prototype.computeSize=function(){if(this.__bvRegionalPromptUiReady)return original.apply(this,arguments);const view=measurementView(this,{inputs:(this.inputs??[]).filter((slot:any)=>!internal(slot)),outputs:(this.outputs??[]).filter((slot:any)=>slot?.name!=="lora_bindings"),widgets:[{type:"button",name:"open_regional_editor",computeSize:()=>[0,20]},{type:"button",name:"quick_edit_regional_prompts",computeSize:()=>[0,20]}]});return original.apply(view,arguments)}}
 
 export function retainNeededProjectedInputs(node:any,wantedNames:string[],matches:(slot:any)=>boolean){const wanted=new Set(wantedNames);for(const {slot,index} of (node.inputs??[]).map((slot:any,index:number)=>({slot,index})).filter(({slot}:any)=>matches(slot)&&!wanted.has(String(slot.name))&&slot.link==null).sort((a:any,b:any)=>b.index-a.index))node.removeInput?.(index);for(const name of wantedNames){const slot=node.inputs?.find((item:any)=>item.name===name);if(slot)markProjectedProvider(slot);}}