[Migration 0-2] Enable ESLint import/no-cycle + boundaries rules

[tom2drum]

Closes #3348

What changed

• Added devDependency eslint-plugin-boundaries (^4.2.2) and registered boundaries/elements plus boundaries/element-types for client/**/*.{ts,tsx} and configs/**/*.{ts,tsx,mjs} with default: disallow and the layer rules from ARCH_REDESIGN.md §8. Migration allowances: legacy-lib, legacy-ui, and toolkit where product code still depends on them; configs may import legacy-lib until config-owned types leave lib/. Type-only cross-layer imports use per-rule importKind: 'type' (plugin v4 does not expose allowTypeImports).
• Enabled import/no-cycle: error for client/**, warn for lib/** and ui/**.
• Extended consistent-default-export-name to client/**/*.tsx (same rule options as ui/**/[A-Z]*.tsx).
• Comment in eslint.config.mjs documents §10 intent for enforcing types/api.ts as the public type surface once more client/ modules exist; capture-based rules are deferred.

Codemods

None.

Cross-slice / legacy imports

No application code was moved. client/features/csv-export continues to use existing imports from lib/*, ui/*, toolkit/*, configs/*, and root types/* (paths outside boundaries/elements stay unchecked by element-types).

Checklist

• pnpm lint:tsc passes
• pnpm lint:eslint completes with exit 0; client/ has no new issues (existing warnings in ui/**/*.pw.tsx only)

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