[Medium] --limit -1 silently returns default results instead of rejecting

[Nicolai1205]

Summary

Passing --limit -1 does not produce a validation error. The CLI silently falls back to the default page size (10 results) with no warning or error.

Repro

nansen research smart-money netflow --chain solana --limit -1

Output: 10 results returned as if --limit was not passed. No error, no warning, exit code 0.

Expected

{"success":false,"error":"--limit must be a positive integer","code":"INVALID_PARAMS"}

Why it matters

Agents constructing dynamic queries may produce negative limits through arithmetic. Silent fallback to default masks the bug and returns unexpected data. The related case (--limit 0) does produce an error, but exposes the internal API field path (body -> pagination -> per_page) rather than referencing the --limit flag.

Found during

Clawfooding session on v1.10.1. Referenced in PR #167.