refactor(navigation)!: delete navigation demo feature

Veect retrofit (ADR-027): fifth and final slice of the demo-content
removal. Deletes packages/navigation whole and prunes every composition
edge in one commit: core-api router mount + dep + router test, core-cms
header-global composition + dep + regenerated Payload types (globals
now empty), web-next bindAll (prod + dev-seed) + tests + Tailwind
source + transpilePackages + dep, cms/core-cms payload config test
assertions, home e2e nav assertion, tsconfig paths, fallow
ignoreDependencies entry, anchor-guard FEATURES list, generator e2e
strip lists + reference-feature comments (navigation -> auth, incl.
feature templates + scaffolding guide), lockfile prune, and
feature-list doc trims (CLAUDE.md, AGENTS.md, glossary, app/feature
AGENTS.md). Compliance YAML regeneration produced no churn (navigation
declared no PII).

Cycle break: navigation's UI hooks were the last edge closing the
committed core-trpc -> core-api -> navigation -> core-trpc package
cycle. With it gone, the lint turbo task graph builds for the first
time and every package's ESLint executes; the epic's lint waiver
expires here. Latent findings: 3 errors, all mechanical, fixed
in-slice - require() import in turbo/generators/config.ts
(no-require-imports), literal type assertion in auth's
authentication.service.ts (prefer-as-const), and next-env.d.ts
triple-slash in apps/cms (rule scoped off for that generated file,
mirroring web-next's existing override). 99 warn-severity findings
remain across 5 packages (pii-declaration-must-be-complete on test
fixtures, turbo/no-undeclared-env-vars on test env keys) - all
warn-by-design, non-gating.

core-trpc keeps a consumer (apps/web-next providers) and stays per
ADR-027. Its unused @trpc/react-query dependency, surfaced by the
post-deletion fallow audit, is removed rather than ignore-listed -
core-trpc's hooks use @trpc/tanstack-react-query. Remaining fallow
warn (auth validateSession "unused member") is a false positive: the
method implements IAuthenticationService and is exercised in
container.test.ts; auth stays untouched as the regression canary.

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

apps/web-next/AGENTS.md

@@ -66,14 +66,14 @@ export function Providers({ children }: { children: React.ReactNode }) {
 
 ## Dependencies
 
-| Dependency                             | Purpose                                                    |
-| -------------------------------------- | ---------------------------------------------------------- |
-| `@repo/core-api`                       | `appRouter` for tRPC endpoint                              |
-| `@repo/core-trpc/next`                 | Next.js tRPC client + provider (optional — scaffold first) |
-| `@repo/core-ui`                        | Design system components (optional — scaffold first)       |
-| `@repo/auth`, `@repo/navigation`, etc. | Feature packages (indirectly via core-api)                 |
-| `next`                                 | Next.js 15 framework                                       |
-| `@trpc/server`                         | tRPC server (fetch adapter)                                |
+| Dependency             | Purpose                                                    |
+| ---------------------- | ---------------------------------------------------------- |
+| `@repo/core-api`       | `appRouter` for tRPC endpoint                              |
+| `@repo/core-trpc/next` | Next.js tRPC client + provider (optional — scaffold first) |
+| `@repo/core-ui`        | Design system components (optional — scaffold first)       |
+| `@repo/auth`, etc.     | Feature packages (indirectly via core-api)                 |
+| `next`                 | Next.js 15 framework                                       |
+| `@trpc/server`         | tRPC server (fetch adapter)                                |
 
 ## Test conventions
 
@@ -104,7 +104,7 @@ Run: `pnpm test:e2e` starts the dev server and runs all `.spec.ts` files.
 
 ## Cross-References
 
-- **Feature packages:** `packages/{auth,navigation}/`
+- **Feature packages:** `packages/auth/`
 - **tRPC composition:** `packages/core-api/AGENTS.md`
 - **tRPC client + provider (optional):** scaffold `@repo/core-trpc` first, then see `turbo/generators/templates/core-package/trpc/AGENTS.md.hbs`
 - **UI components (optional):** scaffold with `pnpm turbo gen core-package ui`, then see `turbo/generators/templates/core-package/ui/AGENTS.md.hbs`