Add integration tests for dynamic page engine

[coderooz]

Status: Pending

What

Integration tests for the page engine that validate end-to-end flows:

1. Config loading flow — fetch mock JSON config -> validate via Zod -> cache in memory -> retrieve from cache
2. Page resolution flow — register pages with slugs -> resolve by slug -> return correct PageConfig -> return undefined for unknown slug
3. Version tracking flow — initialize VersionTracker -> check pages -> detect stale pages -> acknowledge page -> verify acknowledged -> acknowledge all stale -> verify empty
4. Component registration flow -> register component -> render section with that component -> verify render output
5. Error boundary flow -> section throws -> ErrorBoundary catches -> retry button appears -> retry succeeds
6. Template rendering flow -> load marketing template -> resolve sections -> render hero-banner + feature-grid + cta-section

Test runner: Vitest (same as core)

Location: packages/feature-dynamic-pages/tests/

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