Venice: fix synced model metadata

[rekram1-node]

Summary

• keep unmatched Venice models as provider definitions instead of generating a models/venice lab namespace
• skip E2EE models because OpenCode does not implement Venice client-side encryption
• stop inferring temperature support and inherit canonical values when available
• regenerate the Venice catalog and add regression coverage

Validation

• bun test packages/core/test/venice-sync.test.ts packages/core/test/sync-runner.test.ts
• bun validate
• bun run venice:sync --dry-run
• git diff --check