fix(app): flip streaming_ask + single_file_ingest capabilities to actual surface (Bug #9)

capabilities_snapshot() 가 streaming_ask + single_file_ingest 를 hardcoded false 로
보고했으나 실제 구현은 v0.20 final-dogfood 에서 production-grade:
- kebab ask --stream → answer_event.v1 ndjson 191 event 정상 emit
- kebab ingest-file <path> / kebab ingest-stdin --title <T> → ingest_report.v1 정상

MCP host + Claude Code skill 등 agent 가 schema.capabilities 로 routing 결정 시
false negative → 사용자가 실제 동작 feature 를 사용 불가능하다고 오인.

http_daemon 은 false 유지 (별도 sub-item 의 non-impl).

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

crates/kebab-app/src/schema.rs

@@ -142,10 +142,10 @@ fn capabilities_snapshot() -> Capabilities {
         rag_multi_turn: true,
         search_cache: true,
         incremental_ingest: true,
-        streaming_ask: false,
+        streaming_ask: true,
         http_daemon: false,
         mcp_server: true,
-        single_file_ingest: false,
+        single_file_ingest: true,
         bulk_search: true,
     }
 }
@@ -268,3 +268,24 @@ mod tests_stats_ext {
         assert_eq!(s.stats.stale_doc_count, 0);
     }
 }
+
+#[cfg(test)]
+mod tests_capabilities {
+    use super::*;
+
+    #[test]
+    fn capabilities_streaming_ask_matches_cli_surface() {
+        // Bug #9: kebab ask --stream 가 answer_event.v1 ndjson 191 event 정상 emit →
+        // capabilities.streaming_ask 가 true 여야 함.
+        let caps = capabilities_snapshot();
+        assert!(caps.streaming_ask, "streaming_ask must be true (Bug #9)");
+    }
+
+    #[test]
+    fn capabilities_single_file_ingest_matches_cli_surface() {
+        // Bug #9: kebab ingest-file <path> + kebab ingest-stdin --title <T> 양쪽 모두
+        // ingest_report.v1 정상 emit → capabilities.single_file_ingest 가 true 여야 함.
+        let caps = capabilities_snapshot();
+        assert!(caps.single_file_ingest, "single_file_ingest must be true (Bug #9)");
+    }
+}