refactor(registry): drop product-UI imitation components from catalog

chat-gpt, claude-chat, claude-code, github-stars, and opencode leave the
catalog per the no-product-imitations policy; their mechanics re-enter
later under generic names with brand supplied via variables.

packages/core/src/registry/remocnUiPrimitivesCatalog.test.ts

@@ -128,11 +128,8 @@ const remainingRemocnComponents = [
   "animated-line-chart",
   "backdrop",
   "browser-flow",
-  "chat-gpt",
   "chat-to-preview-layout",
   "chromatic-aberration-wipe",
-  "claude-chat",
-  "claude-code",
   "code-accordion",
   "code-diff-wipe",
   "command-menu-item",
@@ -145,7 +142,6 @@ const remainingRemocnComponents = [
   "dropdown-menu-item",
   "ecosystem-constellation",
   "frosted-glass-wipe",
-  "github-stars",
   "glass-code-block",
   "hero-device-assemble",
   "image-expand-to-fullscreen",
@@ -155,7 +151,6 @@ const remainingRemocnComponents = [
   "live-code-compilation",
   "mesh-gradient-bg",
   "micro-scale-fade",
-  "opencode",
   "pricing-tier-focus",
   "progress-steps",
   "registry",