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/skip_reason.rs

@@ -13,7 +13,7 @@ fn unsupported_extension_skip_carries_warning_and_is_aggregated() {
     std::fs::write(workspace_root.join("legacy.docx"), b"unsupported").unwrap();
     std::fs::write(workspace_root.join("Makefile"), b"unsupported").unwrap();
 
-    let report = kebab_app::ingest_with_config(env.config.clone(), env.scope(), false).unwrap();
+    let report = kebab_app::ingest_with_config(env.config.clone(), env.scope(), kebab_app::IngestOpts::default()).unwrap();
 
     let items = report.items.as_ref().expect("items array populated");
     let docx_item = items