Reworked UI copy to describe user-visible outcomes instead of the underlying record and fold mechanics.
- Reframed system artifacts as current documents or dated decision history, with clearer version and review labels.
- Simplified documentation setup, permissions, feedback-source help, and page-failure recovery copy.
- Made every fixture write surface consistently describe the built-in demo as read-only.
- Updated the write-path regression test for the new actionable error.
Checks: pnpm build; pnpm --filter @radial/ui typecheck; pnpm --filter @radial/ui test (902 passed); pnpm lint; Impeccable detector (no findings).