Stop the huginn-cc fixture from naming Huginn as emitter or split target

The fixture is a retired projection Eve keeps for lowering conformance.
Its purpose and the .eve header still said Huginn owns runtime
stewardship and emits the DSL, and splitTarget still pointed at Huginn.
Say what is true and drop splitTarget: the schema types it as an optional
string, so null is invalid and omission is the sanctioned "none", which
is how the other Eve-owned fixtures already spell it.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

web/fixtures/huginn-cc-surface.conformance.json

@@ -8,12 +8,11 @@
     "transport": "local-eve-dsl",
     "path": "web/fixtures/huginn-cc-surface.eve"
   },
-  "purpose": "Proves a provider-owned .cc inspection surface can be lowered through Eve while Huginn owns runtime stewardship.",
+  "purpose": "Retired-projection fixture owned by Eve: proves a provider-shaped .cc inspection surface can be lowered through Eve. No runtime owns or emits this surface.",
   "exitCriteria": "Retired-projection fixture retained for lowering conformance; Huginn is the memory organ and will not own this surface, and generic .cc inspection belongs to CultCache Studio.",
   "asserts": [
     "CultCache inspector cards",
     "record list bindings",
     "provider-owned inspection state"
-  ],
-  "splitTarget": "Huginn"
+  ]
 }

web/fixtures/huginn-cc-surface.eve

@@ -1,4 +1,4 @@
-# Huginn emits Eve DSL. Renderers compile and lower it.
+# Retired-projection fixture owned by Eve for lowering conformance. Nothing emits this surface; Huginn is the memory organ, not a .cc inspector.
 surface cultcache.huginn.inspector "Huginn .cc Inspector"
 version 1