fix(pattern): route schema violations

[chickendreanso]

Summary

• compile-pattern schema errors were thrown as ExceptionInfo, caught by remote/execute's generic catch as :execution-error (HTTP 500)
• Schema violations should produce :schema-violation (HTTP 403) per the wire protocol spec
• compile-pattern now returns (constantly (fail ...)) with :matcher-type :schema — a fn that always produces MatchFailure
• No changes to remote/http.cljc — the existing match-failure->error path handles it automatically