- Add normalizeLoopbackTarget() with loopback-only URL validation - Add JSON-RPC response decoder with schema validation - Define 8 tagged errors using Data.TaggedError - 20 tests covering target policy and protocol decoding - Re-export all public types from index.ts
- Fix _validate_reachable_outcomes to skip unknown nodes (root cause) - Add safety net in validate_workflow_draft for diagnostics exceptions - Add test proving forward-route edits persist as invalid