🚑 fix(kebab-cli): add schema_version field to wire.rs ErrorV1 test literal

Task 8 commit f9a1548 added `schema_version: String` as required field on
ErrorV1 (so kebab-mcp's direct serialize-then-emit path produces correct
error.v1 wire). The wire.rs ErrorV1 literal in the
error_wrapper_tags_schema_version_and_emits_code test was missed —
breaks kebab-cli build. Add the field to the test fixture.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

crates/kebab-cli/src/wire.rs

@@ -264,6 +264,7 @@ mod tests {
     fn error_wrapper_tags_schema_version_and_emits_code() {
         use kebab_app::ErrorV1;
         let err = ErrorV1 {
+            schema_version: "error.v1".to_string(),
             code: "config_invalid".to_string(),
             message: "bad config".to_string(),
             details: serde_json::json!({"path": "/tmp/x"}),