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- Level-up build-route advisor (src/features/characters/sheet/LevelUpAdvisor.tsx + useLevelUpAdvisor): ~4 system-aware routes plus a custom one; choosing a route expands it into concrete next-level steps. AI when configured, deterministic fallback (src/lib/assistant/levelup.ts) otherwise. Embedded in the existing HP-only LevelUpModal, which stays primary. - Level-up prompts/schemas added to prompts.ts (buildRoutes/buildSteps), each leading with the system constraint + class + next level. - Campaign Insights section on the Assistant page renders deterministic themes, with an optional 'ask the assistant to expand' affordance when AI is on. levelup + prompt unit tests (4 routes both systems, system vocabulary, custom route); e2e for the deterministic route→steps flow and the insights section. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>