refactor(app): ingest API 6변종 → 2 (ingest + ingest_with_config{IngestOpts})

summary_only를 IngestOpts에 흡수, progress/cancellable/opts 변종 제거.
재인덱싱 게이트 CHUNKS/SEARCH/ASK byte-IDENTICAL, clippy --all-targets 0.

crates/kebab-app/tests/common/mod.rs

@@ -107,7 +107,7 @@ pub fn ingest_md(env: &TestEnv, relative_path: &str, content: &str) {
         std::fs::create_dir_all(parent).expect("create parent dirs");
     }
     std::fs::write(&path, content).expect("write workspace file");
-    kebab_app::ingest_with_config(env.config.clone(), env.scope(), true)
+    kebab_app::ingest_with_config(env.config.clone(), env.scope(), kebab_app::IngestOpts { summary_only: true, ..Default::default() })
         .expect("ingest_with_config");
 }