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

turbo/generators/__tests__/core-package-events.e2e.test.ts

@@ -65,7 +65,6 @@ describe("e2e: core-package events", () => {
       // succeeds without the package being present (simulating the post-removal state).
       const featurePackages = [
         "auth",
-        "blog",
         "media",
         "marketing-pages",
         "navigation",

turbo/generators/__tests__/core-package-trpc.e2e.test.ts

@@ -63,11 +63,10 @@ describe("e2e: core-package trpc", () => {
 
       // Strip @repo/core-trpc from every package that references it so pnpm
       // install succeeds without the package being present (simulating the
-      // post-removal state). Apps list it directly; the blog, marketing-pages,
-      // and navigation features depend on it for their ./ui tRPC hooks.
+      // post-removal state). Apps list it directly; the marketing-pages and
+      // navigation features depend on it for their ./ui tRPC hooks.
       for (const pkgDir of [
         ["apps", "web-next"],
-        ["packages", "blog"],
         ["packages", "marketing-pages"],
         ["packages", "navigation"],
       ]) {