Drop wall + fence feature flags: register unconditionally; remove verification logs

Parity comparison against deployed prod is now cleaner than juggling
env-var flag toggles locally. Both kinds enter builtinPlugin.nodes
unconditionally; the Phase 0 dispatch shims (<LegacySystem kind="X">
wrappers + NodeRenderer's registry-first branch) handle the cutover.

Files deleted:
 - packages/nodes/src/wall/feature-flag.ts
 - packages/nodes/src/fence/feature-flag.ts

Files changed:
 - packages/nodes/src/index.ts: drops isWallRegistryEnabled /
   isFenceRegistryEnabled gates; wallDefinition + fenceDefinition
   land directly in builtinPlugin.nodes.
 - packages/nodes/src/{wall,fence}/index.ts: drop the flag re-export.
 - packages/nodes/src/{wall,fence}/renderer.tsx: drop the one-shot
   verification console.info. Same for the system.tsx wrappers.
 - packages/viewer/src/components/renderers/{wall,fence}/{wall,fence}-
   renderer.tsx: drop the paired [X:legacy] verification logs (no
   longer comparing flag-toggled paths).

Net DX: no env var to remember when starting `bun dev:community`. To
A/B test, compare against editor.pascal.app deployed prod.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/nodes/src/index.ts

@@ -1,8 +1,8 @@
 import type { AnyNodeDefinition, Plugin } from '@pascal-app/core'
-import { fenceDefinition, isFenceRegistryEnabled } from './fence'
+import { fenceDefinition } from './fence'
 import { shelfDefinition } from './shelf'
 import { spawnDefinition } from './spawn'
-import { isWallRegistryEnabled, wallDefinition } from './wall'
+import { wallDefinition } from './wall'
 
 /**
  * Built-in plugin bundling every node kind shipped with the Pascal editor.
@@ -15,35 +15,21 @@ import { isWallRegistryEnabled, wallDefinition } from './wall'
  * `loadPlugin` call path. This is intentional: the API is stress-tested
  * by built-ins before any third-party plugin lands.
  *
- * Status by kind:
- *  - **shelf**: brand-new kind, registry-driven, no legacy. Registered
- *    unconditionally.
- *  - **spawn**: migrated to the registry path during Phase 2. Legacy
- *    SpawnRenderer / SpawnTool files still present in viewer/editor but
- *    short-circuited by the Phase 0 shims. Registered unconditionally.
- *  - **wall**: registry-driven behind `NEXT_PUBLIC_USE_REGISTRY_FOR_WALL`.
- *    Phase 3 stress test; flag drops when fixture parity signs off.
- *  - **fence**: registry-driven behind `NEXT_PUBLIC_USE_REGISTRY_FOR_FENCE`.
- *    First Phase 5 batch-migration kind. Same shape as wall (thin
- *    renderer + system re-export); pure geometry / floor-plan / tool
- *    affordance ports as later milestones.
+ * All four current kinds are registered unconditionally. Parity is
+ * verified by comparing against deployed production rather than an
+ * in-app env-var flag toggle. Legacy paths still exist in `viewer/` and
+ * `editor/` for kinds undergoing migration; they short-circuit via the
+ * Phase 0 `<LegacySystem>` wrapper + `NodeRenderer`'s registry-first
+ * dispatch. Phase 6 deletes the legacy paths.
  */
-const wallEntries: AnyNodeDefinition[] = isWallRegistryEnabled()
-  ? [wallDefinition as unknown as AnyNodeDefinition]
-  : []
-
-const fenceEntries: AnyNodeDefinition[] = isFenceRegistryEnabled()
-  ? [fenceDefinition as unknown as AnyNodeDefinition]
-  : []
-
 export const builtinPlugin: Plugin = {
   id: 'pascal:core',
   apiVersion: 1,
   nodes: [
     shelfDefinition as unknown as AnyNodeDefinition,
     spawnDefinition as unknown as AnyNodeDefinition,
-    ...wallEntries,
-    ...fenceEntries,
+    wallDefinition as unknown as AnyNodeDefinition,
+    fenceDefinition as unknown as AnyNodeDefinition,
   ],
 }