Add per-folder CLAUDE.md for key packages

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

apps/trust/CLAUDE.md

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+# apps/trust
+
+React 19 + Vite + TypeScript + Relay + TailwindCSS. Port 5174.
+
+Same frontend stack as `apps/console/` — see its CLAUDE.md for Relay query patterns, mutation hooks, and component conventions.
+
+## Trust-specific differences
+
+- Public-facing trust center app (not an internal dashboard)
+- Path-prefix routing: `/trust/{slug}` for Probo-hosted, `/` for custom domains
+- Routes: `/overview`, `/documents`, `/subprocessors`, `/updates`
+- Auth flow: `/connect`, `/verify-magic-link`, `/full-name`
+- Content routes (`/overview`, `/documents`, `/subprocessors`, `/updates`) wrapped in `MainLayout`
+- Auth routes (`/connect`, `/verify-magic-link`, `/full-name`) wrapped in `AuthLayout`
+- All route groups use `RootErrorBoundary`