refactor(blog)!: delete blog demo feature

Veect retrofit (ADR-027): the template's demo content is being removed
to make room for the Veect package map. This slice deletes
packages/blog whole and prunes every composition edge in one commit:
core-api router mount, core-cms collections + regenerated Payload
types, web-next bindAll entry / home page / blog route / Tailwind
sources, blog e2e spec, tsconfig paths, fallow ignore entry,
anchor-guard + generator e2e feature lists, compliance artifacts,
and feature-list doc entries (CLAUDE.md, AGENTS.md, glossary).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016j8z4VHjedXDTjEDNg7qHK

packages/core-cms/src/payload.config.ts

@@ -5,7 +5,6 @@ import path from "node:path";
 import { fileURLToPath } from "node:url";
 
 import { users } from "@repo/auth/cms";
-import { articles } from "@repo/blog/cms";
 import { media } from "@repo/media/cms";
 import { pages, siteSettings } from "@repo/marketing-pages/cms";
 import { header } from "@repo/navigation/cms";
@@ -15,7 +14,7 @@ const dirname = path.dirname(filename);
 
 export default buildConfig({
   editor: lexicalEditor(),
-  collections: [users, articles, pages, media],
+  collections: [users, pages, media],
   globals: [siteSettings, header],
   secret: process.env.PAYLOAD_SECRET || "default-secret-change-me",
   db: postgresAdapter({