Resolves conflicts with ticket 018 (boolean param kind) in src/engine.rs, webapp/src/lib/api.ts, and Params.tsx: boolean-kind params and JSON-field-path extraction now coexist as independent extraction modes alongside regex capture groups. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01XFUNZwCvz3kcod3352ZR2o