refactor(rename): kb crates → kebab — Cargo packages, folders, Rust modules

프로젝트 이름 `kb` → `kebab` rename 의 첫 단계.

- workspace `Cargo.toml`: members `crates/kb-*` → `crates/kebab-*`,
  repository URL `altair823/kb` → `altair823/kebab`.
- 18 crate 폴더 rename via `git mv` (history 보존).
- 각 crate `Cargo.toml`: `name = "kb-*"` → `"kebab-*"`, path deps
  `../kb-*` → `../kebab-*`.
- 모든 `.rs`: `kb_<id>` snake-case 모듈 path 18 개 (`kb_core`,
  `kb_config`, `kb_app`, `kb_cli`, `kb_eval`, `kb_search`, `kb_chunk`,
  `kb_normalize`, `kb_source_fs`, `kb_parse_md`, `kb_parse_types`,
  `kb_store_sqlite`, `kb_store_vector`, `kb_embed`, `kb_embed_local`,
  `kb_llm`, `kb_llm_local`, `kb_rag`) → `kebab_<id>` 일괄 sed (단어
  경계 \\b 사용해 영어 문장 안의 "kb" 약어 미오염).

CLI binary 이름 (`[[bin]] name = "kb"`), 환경변수 `KB_*`, XDG paths,
tracing target, 그리고 docs sweep 은 다음 commit 에서.

## 검증

- `cargo check --workspace` clean — 모든 crate 빌드 통과 후 commit.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

crates/kebab-app/tests/ask_smoke.rs

@@ -0,0 +1,43 @@
+//! `kb-app::ask` smoke tests.
+//!
+//! The pipeline's behavior is exhaustively covered by `kb-rag` tests
+//! (which inject `MockLanguageModel` + `MockRetriever`). The kb-app
+//! facade is a thin component wirer: it picks the retriever per
+//! `opts.mode` and constructs an `OllamaLanguageModel`. Exercising
+//! that wiring requires a real Ollama on `127.0.0.1:11434`, so this
+//! test is `#[ignore]` by default — run with `cargo test -p kb-app
+//! --test ask_smoke -- --ignored` against a live Ollama.
+
+mod common;
+
+use common::TestEnv;
+
+/// Lexical-mode ask end-to-end. Requires a real Ollama on
+/// `config.models.llm.endpoint` (default `127.0.0.1:11434`) running the
+/// configured model. The pipeline body is otherwise covered by kb-rag's
+/// integration tests; this just verifies the facade composes the
+/// components correctly.
+#[test]
+#[ignore = "requires real Ollama on 127.0.0.1:11434"]
+fn ask_lexical_smoke() {
+    let env = TestEnv::lexical_only();
+    kebab_app::ingest_with_config(env.config.clone(), env.scope(), true).unwrap();
+
+    let opts = kebab_app::AskOpts {
+        k: 5,
+        explain: false,
+        mode: kebab_core::SearchMode::Lexical,
+        temperature: Some(0.0),
+        seed: Some(0),
+        stream_sink: None,
+    };
+    // The fixture workspace contains "ownership" content; the model's
+    // citation behavior depends on its training, so we don't assert on
+    // grounded — only that the call returns a structurally-valid Answer.
+    let answer = kebab_app::ask_with_config(env.config.clone(), "ownership", opts)
+        .expect("ask returns Ok with a real Ollama backend");
+    // retrieval summary always populated, regardless of grounded path.
+    assert_eq!(answer.retrieval.mode, kebab_core::SearchMode::Lexical);
+    assert!(answer.retrieval.k >= 5);
+    assert!(answer.retrieval.trace_id.0.starts_with("ret_"));
+}